R. Essig - On Behalf of the Fermi-LAT Collaboration

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R. Essig
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On Behalf of the Fermi-LAT Collaboration
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High Energy Physics - Phenomenology (42)
 
High Energy Physics - Experiment (36)
 
Cosmology and Nongalactic Astrophysics (19)
 
High Energy Astrophysical Phenomena (12)
 
High Energy Physics - Theory (4)
 
Nuclear Experiment (4)
 
Physics - Instrumentation and Detectors (2)
 
Astrophysics of Galaxies (2)
 
Quantum Physics (1)
 
Instrumentation and Methods for Astrophysics (1)

Publications Authored By R. Essig

We study in detail sub-GeV dark matter scattering off electrons in xenon, including the expected electron recoil spectra and annual modulation spectra. We derive improved constraints using low-energy XENON10 and XENON100 ionization-only data. For XENON10, in addition to including electron-recoil data corresponding to about $1-3$ electrons, we include for the first time events with $\gtrsim 4$ electrons. Read More

We revisit constraints on dark photons with masses below ~ 100 MeV from the observations of Supernova 1987A. If dark photons are produced in sufficient quantity, they reduce the amount of energy emitted in the form of neutrinos, in conflict with observations. For the first time, we include the effects of finite temperature and density on the kinetic-mixing parameter, epsilon, in this environment. Read More

2016Aug
Authors: Jim Alexander, Marco Battaglieri, Bertrand Echenard, Rouven Essig, Matthew Graham, Eder Izaguirre, John Jaros, Gordan Krnjaic, Jeremy Mardon, David Morrissey, Tim Nelson, Maxim Perelstein, Matt Pyle, Adam Ritz, Philip Schuster, Brian Shuve, Natalia Toro, Richard G Van De Water, Daniel Akerib, Haipeng An, Konrad Aniol, Isaac J. Arnquist, David M. Asner, Henning O. Back, Keith Baker, Nathan Baltzell, Dipanwita Banerjee, Brian Batell, Daniel Bauer, James Beacham, Jay Benesch, James Bjorken, Nikita Blinov, Celine Boehm, Mariangela Bondí, Walter Bonivento, Fabio Bossi, Stanley J. Brodsky, Ran Budnik, Stephen Bueltmann, Masroor H. Bukhari, Raymond Bunker, Massimo Carpinelli, Concetta Cartaro, David Cassel, Gianluca Cavoto, Andrea Celentano, Animesh Chaterjee, Saptarshi Chaudhuri, Gabriele Chiodini, Hsiao-Mei Sherry Cho, Eric D. Church, D. A. Cooke, Jodi Cooley, Robert Cooper, Ross Corliss, Paolo Crivelli, Francesca Curciarello, Annalisa D'Angelo, Hooman Davoudiasl, Marzio De Napoli, Raffaella De Vita, Achim Denig, Patrick deNiverville, Abhay Deshpande, Ranjan Dharmapalan, Bogdan Dobrescu, Sergey Donskov, Raphael Dupre, Juan Estrada, Stuart Fegan, Torben Ferber, Clive Field, Enectali Figueroa-Feliciano, Alessandra Filippi, Bartosz Fornal, Arne Freyberger, Alexander Friedland, Iftach Galon, Susan Gardner, Francois-Xavier Girod, Sergei Gninenko, Andrey Golutvin, Stefania Gori, Christoph Grab, Enrico Graziani, Keith Griffioen, Andrew Haas, Keisuke Harigaya, Christopher Hearty, Scott Hertel, JoAnne Hewett, Andrew Hime, David Hitlin, Yonit Hochberg, Roy J. Holt, Maurik Holtrop, Eric W. Hoppe, Todd W. Hossbach, Lauren Hsu, Phil Ilten, Joe Incandela, Gianluca Inguglia, Kent Irwin, Igal Jaegle, Robert P. Johnson, Yonatan Kahn, Grzegorz Kalicy, Zhong-Bo Kang, Vardan Khachatryan, Venelin Kozhuharov, N. V. Krasnikov, Valery Kubarovsky, Eric Kuflik, Noah Kurinsky, Ranjan Laha, Gaia Lanfranchi, Dale Li, Tongyan Lin, Mariangela Lisanti, Kun Liu, Ming Liu, Ben Loer, Dinesh Loomba, Valery E. Lyubovitskij, Aaron Manalaysay, Giuseppe Mandaglio, Jeremiah Mans, W. J. Marciano, Thomas Markiewicz, Luca Marsicano, Takashi Maruyama, Victor A. Matveev, David McKeen, Bryan McKinnon, Dan McKinsey, Harald Merkel, Jeremy Mock, Maria Elena Monzani, Omar Moreno, Corina Nantais, Sebouh Paul, Michael Peskin, Vladimir Poliakov, Antonio D Polosa, Maxim Pospelov, Igor Rachek, Balint Radics, Mauro Raggi, Nunzio Randazzo, Blair Ratcliff, Alessandro Rizzo, Thomas Rizzo, Alan Robinson, Andre Rubbia, David Rubin, Dylan Rueter, Tarek Saab, Elena Santopinto, Richard Schnee, Jessie Shelton, Gabriele Simi, Ani Simonyan, Valeria Sipala, Oren Slone, Elton Smith, Daniel Snowden-Ifft, Matthew Solt, Peter Sorensen, Yotam Soreq, Stefania Spagnolo, James Spencer, Stepan Stepanyan, Jan Strube, Michael Sullivan, Arun S. Tadepalli, Tim Tait, Mauro Taiuti, Philip Tanedo, Rex Tayloe, Jesse Thaler, Nhan V. Tran, Sean Tulin, Christopher G. Tully, Sho Uemura, Maurizio Ungaro, Paolo Valente, Holly Vance, Jerry Vavra, Tomer Volansky, Belina von Krosigk, Andrew Whitbeck, Mike Williams, Peter Wittich, Bogdan Wojtsekhowski, Wei Xue, Jong Min Yoon, Hai-Bo Yu, Jaehoon Yu, Tien-Tien Yu, Yue Zhang, Yue Zhao, Yiming Zhong, Kathryn Zurek

This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years. Read More

We explore a new low-threshold direct-detection concept for dark matter, based on the breaking of chemical bonds between atoms. This includes the dissociation of molecules and the creation of defects in a lattice. With thresholds of a few to 10's of eV, such an experiment could probe the nuclear couplings of dark matter particles as light as a few MeV. Read More

We consider the absorption by bound electrons of dark matter in the form of dark photons and axion-like particles, as well as of dark photons from the Sun, in current and next-generation direct detection experiments. Experiments sensitive to electron recoils can detect such particles with masses between a few eV to more than 10 keV. For dark photon dark matter, we update a previous bound based on XENON10 data and derive new bounds based on data from XENON100 and CDMSlite. Read More

2016Jul

MeV-GeV dark matter (DM) is theoretically well motivated but remarkably unexplored. This proposal presents the MeV-GeV DM discovery potential for a $\sim$1 m$^3$ segmented CsI(Tl) scintillator detector placed downstream of the Hall A beam-dump at Jefferson Lab, receiving up to 10$^{22}$ electrons-on-target (EOT) in 285 days. This experiment (Beam-Dump eXperiment or BDX) would be sensitive to elastic DM-electron and to inelastic DM scattering at the level of 10 counts per year, reaching the limit of the neutrino irreducible background. Read More

We describe a novel search for MeV-to-GeV-mass dark matter, in which the dark matter scatters off electrons in a scintillating target. The excitation and subsequent de-excitation of the electron produces one or more photons, which could be detected with an array of cryogenic low-noise photodetectors, such as transition edge sensors (TES) or microwave kinetic inductance devices (MKID). Scintillators may have distinct advantages over other experiments searching for a low ionization signal from sub-GeV DM. Read More

2016Jun

This report summarises the physics opportunities in the search and study of physics beyond the Standard Model at a 100 TeV pp collider. Read More

Dark matter in the sub-GeV mass range is a theoretically motivated but largely unexplored paradigm. Such light masses are out of reach for conventional nuclear recoil direct detection experiments, but may be detected through the small ionization signals caused by dark matter-electron scattering. Semiconductors are well-studied and are particularly promising target materials because their ${\cal O}(1~\rm{eV})$ band gaps allow for ionization signals from dark matter as light as a few hundred keV. Read More

2015Apr

This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search for Hidden Particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, $\tau\to 3\mu$ and to search for weakly-interacting sub-GeV dark matter candidates. Read More

We set conservative, robust constraints on the annihilation and decay of dark matter into various Standard Model final states under various assumptions about the distribution of the dark matter in the Milky Way halo. We use the inclusive photon spectrum observed by the Fermi Gamma-ray Space Telescope through its main instrument, the Large-Area Telescope (LAT). We use simulated data to first find the "optimal" regions of interest in the gamma-ray sky, where the expected dark matter signal is largest compared with the expected astrophysical foregrounds. Read More

2015Mar
Authors: The Fermi-LAT Collaboration, The DES Collaboration, :, A. Drlica-Wagner, A. Albert, K. Bechtol, M. Wood, L. Strigari, M. Sanchez-Conde, L. Baldini, R. Essig, J. Cohen-Tanugi, B. Anderson, R. Bellazzini, E. D. Bloom, R. Caputo, C. Cecchi, E. Charles, J. Chiang, A. de Angelis, S. Funk, P. Fusco, F. Gargano, N. Giglietto, F. Giordano, S. Guiriec, M. Gustafsson, M. Kuss, F. Loparco, P. Lubrano, N. Mirabal, T. Mizuno, A. Morselli, T. Ohsugi, E. Orlando, M. Persic, S. Raino, N. Sehgal, F. Spada, D. J. Suson, G. Zaharijas, S. Zimmer, T. Abbott, S. Allam, E. Balbinot, A. H. Bauer, A. Benoit-Levy, R. A. Bernstein, G. M. Bernstein, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, F. J. Castander, R. Covarrubias, C. B. D'Andrea, L. N. da Costa, D. L. DePoy, S. Desai, H. T. Diehl, C. E Cunha, T. F. Eifler, J. Estrada, A. E. Evrard, A. Fausti Neto, E. Fernandez, D. A. Finley, B. Flaugher, J. Frieman, E. Gaztanaga, D. Gerdes, D. Gruen, R. A. Gruendl, G. Gutierrez, K. Honscheid, B. Jain, D. James, T. Jeltema, S. Kent, R. Kron, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, E. Luque, M. A. G. Maia, M. Makler, M. March, J. Marshall, P. Martini, K. W. Merritt, C. Miller, R. Miquel, J. Mohr, E. Neilsen, B. Nord, R. Ogando, J. Peoples, D. Petravick, A. Pieres, A. A. Plazas, A. Queiroz, A. K. Romer, A. Roodman, E. S. Rykoff, M. Sako, E. Sanchez, B. Santiago, V. Scarpine, M. Schubnell, I. Sevilla, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, J. Thaler, D. Thomas, D. Tucker, A. Walker, R. H. Wechsler, W. Wester, P. Williams, B. Yanny, J. Zuntz

Due to their proximity, high dark-matter content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection of dark matter. Recently, eight new dSph candidates were discovered using the first year of data from the Dark Energy Survey (DES). We searched for gamma-ray emission coincident with the positions of these new objects in six years of Fermi Large Area Telescope data. Read More

The search for exotic Higgs decays are an essential probe of new physics. In particular, the small width of the Higgs boson makes its decay uniquely sensitive to the existence of light hidden sectors. Here we assess the potential of an exotic Higgs decay search for h -> 2X -> bbmumu to constrain theories with light CP-even (X = s) and CP-odd (X = a) singlet scalars in the mass range of 15 to 60 GeV. Read More

High-energy colliders offer a unique sensitivity to dark photons, the mediators of a broken dark U(1) gauge theory that kinetically mixes with the Standard Model (SM) hypercharge. Dark photons can be detected in the exotic decay of the 125 GeV Higgs boson, h -> Z Z_D -> 4l, and in Drell-Yan events, pp -> Z_D -> ll. If the dark U(1) is broken by a hidden-sector Higgs mechanism, then mixing between the dark and SM Higgs bosons also allows the exotic decay h -> Z_D Z_D -> 4l. Read More

We show that dark photons (A') with masses ~10-80 MeV can be probed in the decay $\mu^+ \to e^+ \nu_e \bar{\nu}_\mu A', A' \to e^+ e^-$, with the upcoming Mu3e experiment at the Paul Scherrer Institute (PSI) in Switzerland. With an expected 10^{15} (5.5 x 10^{16}) muon decays in 2015-2016 (2018 and beyond), Mu3e has the exciting opportunity to probe a substantial fraction of currently unexplored dark photon parameter space, probing kinetic-mixing parameter, epsilon, as low as epsilon^2 ~ 10^{-7} (10^{-8}). Read More

The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm that the trigger rates and occupancies are as expected. This paper describes the HPS Test Run apparatus and readout electronics and its performance. Read More

We present new constraints on sub-GeV dark matter and dark photons from the electron beam-dump experiment E137 conducted at SLAC in 1980-1982. Dark matter interacting with electrons (e.g. Read More

These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 2, on the Intensity Frontier, discusses the program of research with high-intensity beams and rare processes. Read More

We perform an extensive survey of non-standard Higgs decays that are consistent with the 125 GeV Higgs-like resonance. Our aim is to motivate a large set of new experimental analyses on the existing and forthcoming data from the Large Hadron Collider (LHC). The explicit search for exotic Higgs decays presents a largely untapped discovery opportunity for the LHC collaborations, as such decays may be easily missed by other searches. Read More

As part of the Snowmass process, the Cosmic Frontier WIMP Direct Detection subgroup (CF1) has drawn on input from the Cosmic Frontier and the broader Particle Physics community to produce this document. The charge to CF1 was (a) to summarize the current status and projected sensitivity of WIMP direct detection experiments worldwide, (b) motivate WIMP dark matter searches over a broad parameter space by examining a spectrum of WIMP models, (c) establish a community consensus on the type of experimental program required to explore that parameter space, and (d) identify the common infrastructure required to practically meet those goals. Read More

Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark sectors, each with their own beautiful structure, distinct particles, and forces. This review summarizes the physics motivation for dark sectors and the exciting opportunities for experimental exploration. Read More

2013Oct

This report summarizes the work of the Energy Frontier Higgs Boson working group of the 2013 Community Summer Study (Snowmass). We identify the key elements of a precision Higgs physics program and document the physics potential of future experimental facilities as elucidated during the Snowmass study. We study Higgs couplings to gauge boson and fermion pairs, double Higgs production for the Higgs self-coupling, its quantum numbers and $CP$-mixing in Higgs couplings, the Higgs mass and total width, and prospects for direct searches for additional Higgs bosons in extensions of the Standard Model. Read More

2013Oct
Authors: The Fermi-LAT Collaboration, :, M. Ackermann, A. Albert, B. Anderson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, E. D. Bloom, E. Bonamente, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, F. D'Ammando, A. de Angelis, C. D. Dermer, S. W. Digel, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, R. Essig, C. Favuzzi, E. C. Ferrara, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, M. Giroletti, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, S. Guiriec, M. Gustafsson, M. Hayashida, E. Hays, J. Hewitt, R. E. Hughes, T. Jogler, T. Kamae, J. Knödlseder, D. Kocevski, M. Kuss, . Larsson, L. Latronico, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, G. Martinez, M. Mayer, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Nemmen, E. Nuss, T. Ohsugi, E. Orlando, J. F. Ormes, J. S. Perkins, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, S. Ritz, M. Sànchez-Conde, N. Sehgal, C. Sgrò, E. J. Siskind, P. Spinelli, L. Strigari, D. J. Suson, H. Tajima, H. Takahashi, J. B. Thayer, L. Tibaldo, M. Tinivella, D. F. Torres, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, G. Vianello, V. Vitale, M. Werner, B. L. Winer, K. S. Wood, M. Wood, G. Zaharijas, S. Zimmer

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via gamma rays. Here we report on gamma-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. Read More

We investigate the power of low-energy, high-luminosity electron--positron colliders to probe hidden sectors with a mass below ~10 GeV that couple to Standard Model particles through a light mediator. Such sectors provide well-motivated dark matter candidates, and can give rise to distinctive mono-photon signals at B-factories and similar experiments. We use data from an existing mono-photon search by BaBar to place new constraints on this class of models, and give projections for the sensitivity of a similar search at a future B-factory such as Belle II. Read More

We present constraints on decaying and annihilating dark matter (DM) in the 4 keV to 10 GeV mass range, using published results from the satellites HEAO-1, INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive analytic expressions for the gamma-ray spectra from various DM decay modes, and find lifetime constraints in the range 10^24-10^28 sec, depending on the DM mass and decay mode. We map these constraints onto the parameter space for a variety of models, including a hidden photino that is part of a kinetically mixed hidden sector, a gravitino with R-parity violating decays, a sterile neutrino, DM with a dipole moment, and a dark pion. Read More

2013Mar
Affiliations: 1On Behalf of the Fermi-LAT Collaboration, 2On Behalf of the Fermi-LAT Collaboration, 3On Behalf of the Fermi-LAT Collaboration, 4On Behalf of the Fermi-LAT Collaboration, 5On Behalf of the Fermi-LAT Collaboration, 6On Behalf of the Fermi-LAT Collaboration, 7On Behalf of the Fermi-LAT Collaboration, 8On Behalf of the Fermi-LAT Collaboration

Since the spring of 2012 there have been many papers published using Fermi LAT public data that claim evidence for narrow spectral lines coming from the region of the Galactic center. This study uses non-Galactic center Fermi-LAT data from survey mode observations, and Earth limb Fermi data to test the dark matter interpretation of this feature and better understand its origins. Read More

We use modern jet-substructure techniques to propose LHC searches for multijet-resonance signals without leptons or missing energy. We focus on three-jet resonances produced by R-parity-violating decays of boosted gluinos, showing that shape analyses searching for a mass peak can probe such gluinos up to masses of ~ 750 GeV (650 GeV) with 20/fb (5/fb) at the LHC at 8 TeV. This complements existing search strategies, which also include counting methods that are inherently more prone to systematic uncertainties. Read More

This white paper summarizes the scientific opportunities for utilization of the upgraded 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) and associated experimental equipment at Jefferson Lab. It is based on the 52 proposals recommended for approval by the Jefferson Lab Program Advisory Committee.The upgraded facility will enable a new experimental program with substantial discovery potential to address important topics in nuclear, hadronic, and electroweak physics. Read More

The first direct detection limits on dark matter in the MeV to GeV mass range are presented, using XENON10 data. Such light dark matter can scatter with electrons, causing ionization of atoms in a detector target material and leading to single- or few-electron events. We use 15 kg-days of data acquired in 2006 to set limits on the dark-matter-electron scattering cross section. Read More

2012May
Authors: J. L. Hewett, H. Weerts, R. Brock, J. N. Butler, B. C. K. Casey, J. Collar, A. de Gouvea, R. Essig, Y. Grossman, W. Haxton, J. A. Jaros, C. K. Jung, Z. T. Lu, K. Pitts, Z. Ligeti, J. R. Patterson, M. Ramsey-Musolf, J. L. Ritchie, A. Roodman, K. Scholberg, C. E. M. Wagner, G. P. Zeller, S. Aefsky, A. Afanasev, K. Agashe, C. Albright, J. Alonso, C. Ankenbrandt, M. Aoki, C. A. Arguelles, N. Arkani-Hamed, J. R. Armendariz, C. Armendariz-Picon, E. Arrieta Diaz, J. Asaadi, D. M. Asner, K. S. Babu, K. Bailey, O. Baker, B. Balantekin, B. Baller, M. Bass, B. Batell, J. Beacham, J. Behr, N. Berger, M. Bergevin, E. Berman, R. Bernstein, A. J. Bevan, M. Bishai, M. Blanke, S. Blessing, A. Blondel, T. Blum, G. Bock, A. Bodek, G. Bonvicini, F. Bossi, J. Boyce, R. Breedon, M. Breidenbach, S. J. Brice, R. A. Briere, S. Brodsky, C. Bromberg, A. Bross, T. E. Browder, D. A. Bryman, M. Buckley, R. Burnstein, E. Caden, P. Campana, R. Carlini, G. Carosi, C. Castromonte, R. Cenci, I. Chakaberia, M. C. Chen, C. H. Cheng, B. Choudhary, N. H. Christ, E. Christensen, M. E. Christy, T. E. Chupp, E. Church, D. B. Cline, T. E. Coan, P. Coloma, J. Comfort, L. Coney, J. Cooper, R. J. Cooper, R. Cowan, D. F. Cowen, D. Cronin-Hennessy, A. Datta, G. S. Davies, M. Demarteau, D. P. DeMille, A. Denig, R. Dermisek, A. Deshpande, M. S. Dewey, R. Dharmapalan, J. Dhooghe, M. R. Dietrich, M. Diwan, Z. Djurcic, S. Dobbs, M. Duraisamy, B. Dutta, H. Duyang, D. A. Dwyer, M. Eads, B. Echenard, S. R. Elliott, C. Escobar, J. Fajans, S. Farooq, C. Faroughy, J. E. Fast, B. Feinberg, J. Felde, G. Feldman, P. Fierlinger, P. Fileviez Perez, B. Filippone, P. Fisher, B. T. Flemming, K. T. Flood, R. Forty, M. J. Frank, A. Freyberger, A. Friedland, R. Gandhi, K. S. Ganezer, A. Garcia, F. G. Garcia, S. Gardner, L. Garrison, A. Gasparian, S. Geer, V. M. Gehman, T. Gershon, M. Gilchriese, C. Ginsberg, I. Gogoladze, M. Gonderinger, M. Goodman, H. Gould, M. Graham, P. W. Graham, R. Gran, J. Grange, G. Gratta, J. P. Green, H. Greenlee, R. C. Group, E. Guardincerri, V. Gudkov, R. Guenette, A. Haas, A. Hahn, T. Han, T. Handler, J. C. Hardy, R. Harnik, D. A. Harris, F. A. Harris, P. G. Harris, J. Hartnett, B. He, B. R. Heckel, K. M. Heeger, S. Henderson, D. Hertzog, R. Hill, E. A Hinds, D. G. Hitlin, R. J. Holt, N. Holtkamp, G. Horton-Smith, P. Huber, W. Huelsnitz, J. Imber, I. Irastorza, J. Jaeckel, I. Jaegle, C. James, A. Jawahery, D. Jensen, C. P. Jessop, B. Jones, H. Jostlein, T. Junk, A. L. Kagan, M. Kalita, Y. Kamyshkov, D. M. Kaplan, G. Karagiorgi, A. Karle, T. Katori, B. Kayser, R. Kephart, S. Kettell, Y. K. Kim, M. Kirby, K. Kirch, J. Klein, J. Kneller, A. Kobach, M. Kohl, J. Kopp, M. Kordosky, W. Korsch, I. Kourbanis, A. D. Krisch, P. Krizan, A. S. Kronfeld, S. Kulkarni, K. S. Kumar, Y. Kuno, T. Kutter, T. Lachenmaier, M. Lamm, J. Lancaster, M. Lancaster, C. Lane, K. Lang, P. Langacker, S. Lazarevic, T. Le, K. Lee, K. T. Lesko, Y. Li, M. Lindgren, A. Lindner, J. Link, D. Lissauer, L. S. Littenberg, B. Littlejohn, C. Y. Liu, W. Loinaz, W. Lorenzon, W. C. Louis, J. Lozier, L. Ludovici, L. Lueking, C. Lunardini, D. B. MacFarlane, P. A. N. Machado, P. B. Mackenzie, J. Maloney, W. J. Marciano, W. Marsh, M. Marshak, J. W. Martin, C. Mauger, K. S. McFarland, C. McGrew, G. McLaughlin, D. McKeen, R. McKeown, B. T. Meadows, R. Mehdiyev, D. Melconian, H. Merkel, M. Messier, J. P. Miller, G. Mills, U. K. Minamisono, S. R. Mishra, I. Mocioiu, S. Moed Sher, R. N. Mohapatra, B. Monreal, C. D. Moore, J. G. Morfin, J. Mousseau, L. A. Moustakas, G. Mueller, P. Mueller, M. Muether, H. P. Mumm, C. Munger, H. Murayama, P. Nath, O. Naviliat-Cuncin, J. K. Nelson, D. Neuffer, J. S. Nico, A. Norman, D. Nygren, Y. Obayashi, T. P. O'Connor, Y. Okada, J. Olsen, L. Orozco, J. L. Orrell, J. Osta, B. Pahlka, J. Paley, V. Papadimitriou, M. Papucci, S. Parke, R. H. Parker, Z. Parsa, K. Partyka, A. Patch, J. C. Pati, R. B. Patterson, Z. Pavlovic, G. Paz, G. N. Perdue, D. Perevalov, G. Perez, R. Petti, W. Pettus, A. Piepke, M. Pivovaroff, R. Plunkett, C. C. Polly, M. Pospelov, R. Povey, A. Prakesh, M. V. Purohit, S. Raby, J. L. Raaf, R. Rajendran, S. Rajendran, G. Rameika, R. Ramsey, A. Rashed, B. N. Ratcliff, B. Rebel, J. Redondo, P. Reimer, D. Reitzner, F. Ringer, A. Ringwald, S. Riordan, B. L. Roberts, D. A. Roberts, R. Robertson, F. Robicheaux, M. Rominsky, R. Roser, J. L. Rosner, C. Rott, P. Rubin, N. Saito, M. Sanchez, S. Sarkar, H. Schellman, B. Schmidt, M. Schmitt, D. W. Schmitz, J. Schneps, A. Schopper, P. Schuster, A. J. Schwartz, M. Schwarz, J. Seeman, Y. K. Semertzidis, K. K. Seth, Q. Shafi, P. Shanahan, R. Sharma, S. R. Sharpe, M. Shiozawa, V. Shiltsev, K. Sigurdson, P. Sikivie, J. Singh, D. Sivers, T. Skwarnicki, N. Smith, J. Sobczyk, H. Sobel, M. Soderberg, Y. H. Song, A. Soni, P. Souder, A. Sousa, J. Spitz, M. Stancari, G. C. Stavenga, J. H. Steffen, S. Stepanyan, D. Stoeckinger, S. Stone, J. Strait, M. Strassler, I. A. Sulai, R. Sundrum, R. Svoboda, B. Szczerbinska, A. Szelc, T. Takeuchi, P. Tanedo, S. Taneja, J. Tang, D. B. Tanner, R. Tayloe, I. Taylor, J. Thomas, C. Thorn, X. Tian, B. G. Tice, M. Tobar, N. Tolich, N. Toro, I. S. Towner, Y. Tsai, R. Tschirhart, C. D. Tunnell, M. Tzanov, A. Upadhye, J. Urheim, S. Vahsen, A. Vainshtein, E. Valencia, R. G. Van de Water, R. S. Van de Water, M. Velasco, J. Vogel, P. Vogel, W. Vogelsang, Y. W. Wah, D. Walker, N. Weiner, A. Weltman, R. Wendell, W. Wester, M. Wetstein, C. White, L. Whitehead, J. Whitmore, E. Widmann, G. Wiedemann, J. Wilkerson, G. Wilkinson, P. Wilson, R. J. Wilson, W. Winter, M. B. Wise, J. Wodin, S. Wojcicki, B. Wojtsekhowski, T. Wongjirad, E. Worcester, J. Wurtele, T. Xin, J. Xu, T. Yamanaka, Y. Yamazaki, I. Yavin, J. Yeck, M. Yeh, M. Yokoyama, J. Yoo, A. Young, E. Zimmerman, K. Zioutas, M. Zisman, J. Zupan, R. Zwaska

The Proceedings of the 2011 workshop on Fundamental Physics at the Intensity Frontier. Science opportunities at the intensity frontier are identified and described in the areas of heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, and nucleons, nuclei, and atoms. Read More

2012May
Authors: Fermi-LAT Collaboration, :, M. Ackermann, M. Ajello, A. Albert, L. Baldini, G. Barbiellini, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, M. Brigida, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, F. D'Ammando, F. de Palma, C. D. Dermer, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, Y. Edmonds, R. Essig, C. Favuzzi, S. J. Fegan, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, D. Horan, R. E. Hughes, T. Kamae, J. Knödlseder, M. Kuss, J. Lande, A. M. Lionetto, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, E. Orlando, J. F. Ormes, D. Paneque, J. H. Panetta, M. Pesce-Rollins, F. Piron, G. Pivato, T. A. Porter, D. Prokhorov, S. Rainò, R. Rando, M. Razzano, O. Reimer, M. Roth, C. Sbarra, J. D. Scargle, C. Sgrò, E. J. Siskind, A. Snyder, P. Spinelli, D. J. Suson, H. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, L. Tibaldo, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, Z. Yang, S. Zimmer

Dark matter particle annihilation or decay can produce monochromatic gamma-ray lines and contribute to the diffuse gamma-ray background. Flux upper limits are presented for gamma-ray spectral lines from 7 to 200 GeV and for the diffuse gamma-ray background from 4.8 GeV to 264 GeV obtained from two years of Fermi Large Area Telescope data integrated over most of the sky. Read More

2012Jan
Authors: The Fermi LAT Collaboration, M. Ackermann, A. Albert, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, E. Bottacini, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. de Palma, C. D. Dermer, S. W. Digel, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, R. Essig, L. Falletti, C. Favuzzi, S. J. Fegan, W. B. Focke, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, X. Hou, R. E. Hughes, R. P. Johnson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knodlseder, M. Kuss, J. Lande, L. Latronico, S. -H. Lee, A. M. Lionetto, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, V. Pelassa, M. Pierbattista, F. Piron, G. Pivato, T. A. Porter, S. Raino, R. Rando, M. Razzano, A. Reimer, O. Reimer, S. Ritz, H. F. -W. Sadrozinski, N. Sehgal, C. Sgro, E. J. Siskind, P. Spinelli, L. Strigari, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, L. Tibaldo, M. Tinivella, D. F. Torres, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, Z. Yang, S. Zalewski, S. Zimmer

Numerical simulations based on the Lambda-CDM model of cosmology predict a large number of as yet unobserved Galactic dark matter satellites. We report the results of a Large Area Telescope (LAT) search for these satellites via the gamma-ray emission expected from the annihilation of weakly interacting massive particle (WIMP) dark matter. Some dark matter satellites are expected to have hard gamma-ray spectra, finite angular extents, and a lack of counterparts at other wavelengths. Read More

In this report we review recent theoretical progress and the latest experimental results in jet substructure from the Tevatron and the LHC. We review the status of and outlook for calculation and simulation tools for studying jet substructure. Following up on the report of the Boost 2010 workshop, we present a new set of benchmark comparisons of substructure techniques, focusing on the set of variables and grooming methods that are collectively known as "top taggers". Read More

We consider a comprehensive set of simplified models that contribute to final states with top and bottom quarks at the LHC. These simplified models are used to create minimal search strategies that ensure optimal coverage of new heavy flavor physics involving the pair production of color octets and triplets. We provide a set of benchmarks that are representative of model space, which can be used by experimentalists to perform their own optimization of search strategies. Read More

We analyze the phases of supersymmetric chiral gauge theories with an antisymmetric tensor and (anti)fundamental flavors, in the presence of a classically marginal superpotential deformation. Varying the number of flavors that appear in the superpotential reveals rich infrared chiral dynamics and novel dualities. The dualities are characterized by an infinite family of magnetic duals with arbitrarily large gauge groups describing the same fixed point, correlated with arbitrarily large classical global symmetries that are truncated nonperturbatively. Read More

Direct detection strategies are proposed for dark matter particles with MeV to GeV mass. In this largely unexplored mass range, dark matter scattering with electrons can cause single-electron ionization signals, which are detectable with current technology. Ultraviolet photons, individual ions, and heat are interesting alternative signals. Read More

We present a search at Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling $\alpha'$ to electrons. Such a particle $A'$ can be produced in electron-nucleus fixed-target scattering and then decay to an $e^+e^-$ pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175--250 MeV, found no evidence for an $A'\to e^+e^-$ reaction, and set an upper limit of $\alpha'/\alpha \simeq 10^{-6}$. Read More

We analyze the phase structure of supersymmetric chiral gauge theories with gauge group SU(N), an antisymmetric, and FRead More

2011May
Authors: Daniele Alves1, Nima Arkani-Hamed2, Sanjay Arora3, Yang Bai4, Matthew Baumgart5, Joshua Berger6, Matthew Buckley7, Bart Butler8, Spencer Chang9, Hsin-Chia Cheng10, Clifford Cheung11, R. Sekhar Chivukula12, Won Sang Cho13, Randy Cotta14, Mariarosaria D'Alfonso15, Sonia El Hedri16, Rouven Essig17, Jared A. Evans18, Liam Fitzpatrick19, Patrick Fox20, Roberto Franceschini21, Ayres Freitas22, James S. Gainer23, Yuri Gershtein24, Richard Gray25, Thomas Gregoire26, Ben Gripaios27, Jack Gunion28, Tao Han29, Andy Haas30, Per Hansson31, JoAnne Hewett32, Dmitry Hits33, Jay Hubisz34, Eder Izaguirre35, Jared Kaplan36, Emanuel Katz37, Can Kilic38, Hyung-Do Kim39, Ryuichiro Kitano40, Sue Ann Koay41, Pyungwon Ko42, David Krohn43, Eric Kuflik44, Ian Lewis45, Mariangela Lisanti46, Tao Liu47, Zhen Liu48, Ran Lu49, Markus Luty50, Patrick Meade51, David Morrissey52, Stephen Mrenna53, Mihoko Nojiri54, Takemichi Okui55, Sanjay Padhi56, Michele Papucci57, Michael Park58, Myeonghun Park59, Maxim Perelstein60, Michael Peskin61, Daniel Phalen62, Keith Rehermann63, Vikram Rentala64, Tuhin Roy65, Joshua T. Ruderman66, Veronica Sanz67, Martin Schmaltz68, Stephen Schnetzer69, Philip Schuster70, Pedro Schwaller71, Matthew D. Schwartz72, Ariel Schwartzman73, Jing Shao74, Jessie Shelton75, David Shih76, Jing Shu77, Daniel Silverstein78, Elizabeth Simmons79, Sunil Somalwar80, Michael Spannowsky81, Christian Spethmann82, Matthew Strassler83, Shufang Su84, Tim Tait85, Brooks Thomas86, Scott Thomas87, Natalia Toro88, Tomer Volansky89, Jay Wacker90, Wolfgang Waltenberger, Itay Yavin, Felix Yu, Yue Zhao, Kathryn Zurek
Affiliations: 1Editor, 2Editor, 3Editor, 4Editor, 5Editor, 6Editor, 7Editor, 8Editor, 9Editor, 10Editor, 11Editor, 12Editor, 13Editor, 14Editor, 15Editor, 16Editor, 17Editor, 18Editor, 19Editor, 20Editor, 21Editor, 22Editor, 23Editor, 24Editor, 25Editor, 26Editor, 27Editor, 28Editor, 29Editor, 30Editor, 31Editor, 32Editor, 33Editor, 34Editor, 35Editor, 36Editor, 37Editor, 38Editor, 39Editor, 40Editor, 41Editor, 42Editor, 43Editor, 44Editor, 45Editor, 46Editor, 47Editor, 48Editor, 49Editor, 50Editor, 51Editor, 52Editor, 53Editor, 54Editor, 55Editor, 56Editor, 57Editor, 58Editor, 59Editor, 60Editor, 61Editor, 62Editor, 63Editor, 64Editor, 65Editor, 66Editor, 67Editor, 68Editor, 69Editor, 70Editor, 71Editor, 72Editor, 73Editor, 74Editor, 75Editor, 76Editor, 77Editor, 78Editor, 79Editor, 80Editor, 81Editor, 82Editor, 83Editor, 84Editor, 85Editor, 86Editor, 87Editor, 88Editor, 89Editor, 90Editor

This document proposes a collection of simplified models relevant to the design of new-physics searches at the LHC and the characterization of their results. Both ATLAS and CMS have already presented some results in terms of simplified models, and we encourage them to continue and expand this effort, which supplements both signature-based results and benchmark model interpretations. A simplified model is defined by an effective Lagrangian describing the interactions of a small number of new particles. Read More

2011Mar
Authors: The MAGIC Collaboration, J. Aleksić1, E. A. Alvarez2, L. A. Antonelli3, P. Antoranz4, M. Asensio5, M. Backes6, J. A. Barrio7, D. Bastieri8, J. Becerra González9, W. Bednarek10, A. Berdyugin11, K. Berger12, E. Bernardini13, A. Biland14, O. Blanch15, R. K. Bock16, A. Boller17, G. Bonnoli18, D. Borla Tridon19, I. Braun20, T. Bretz21, A. Cañellas22, E. Carmona23, A. Carosi24, P. Colin25, E. Colombo26, J. L. Contreras27, J. Cortina28, L. Cossio29, S. Covino30, F. Dazzi31, A. De Angelis32, E. De Cea del Pozo33, B. De Lotto34, C. Delgado Mendez35, A. Diago Ortega36, M. Doert37, A. Domínguez38, D. Dominis Prester39, D. Dorner40, M. Doro41, D. Elsaesser42, D. Ferenc43, M. V. Fonseca44, L. Font45, C. Fruck46, R. J. García López47, M. Garczarczyk48, D. Garrido49, G. Giavitto50, N. Godinović51, D. Hadasch52, D. Häfner53, A. Herrero54, D. Hildebrand55, D. Höhne-Mönch56, J. Hose57, D. Hrupec58, B. Huber59, T. Jogler60, S. Klepser61, T. Krähenbühl62, J. Krause63, A. La Barbera64, D. Lelas65, E. Leonardo66, E. Lindfors67, S. Lombardi68, M. López69, E. Lorenz70, M. Makariev71, G. Maneva72, N. Mankuzhiyil73, K. Mannheim74, L. Maraschi75, M. Mariotti76, M. Martínez77, D. Mazin78, M. Meucci79, J. M. Miranda80, R. Mirzoyan81, H. Miyamoto82, J. Moldón83, A. Moralejo84, P. Munar-Adrover85, D. Nieto86, K. Nilsson87, R. Orito88, I. Oya89, S. Paiano90, D. Paneque91, R. Paoletti92, S. Pardo93, J. M. Paredes94, S. Partini95, M. Pasanen96, F. Pauss97, M. A. Perez-Torres98, M. Persic99, L. Peruzzo100, M. Pilia101, J. Pochon102, F. Prada103, P. G. Prada Moroni104, E. Prandini105, I. Puljak106, I. Reichardt107, R. Reinthal108, W. Rhode109, M. Ribó110, J. Rico111, S. Rügamer112, A. Saggion113, K. Saito114, T. Y. Saito115, M. Salvati116, K. Satalecka117, V. Scalzotto118, V. Scapin119, C. Schultz120, T. Schweizer121, M. Shayduk122, S. N. Shore123, A. Sillanpää124, J. Sitarek125, D. Sobczynska126, F. Spanier127, S. Spiro128, A. Stamerra129, B. Steinke130, J. Storz131, N. Strah132, T. Surić133, L. Takalo134, H. Takami135, F. Tavecchio136, P. Temnikov137, T. Terzić138, D. Tescaro139, M. Teshima140, M. Thom141, O. Tibolla142, D. F. Torres143, A. Treves144, H. Vankov145, P. Vogler146, R. M. Wagner147, Q. Weitzel148, V. Zabalza149, F. Zandanel150, R. Zanin151, M. Fornasa152, R. Essig153, N. Sehgal154, L. E. Strigari155
Affiliations: 1IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 2Universidad Complutense, E-28040 Madrid, Spain, 3INAF National Institute for Astrophysics, I-00136 Rome, Italy, 4Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 5Universidad Complutense, E-28040 Madrid, Spain, 6Technische Universität Dortmund, D-44221 Dortmund, Germany, 7Universidad Complutense, E-28040 Madrid, Spain, 8Università di Padova and INFN, I-35131 Padova, Italy, 9Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 10University of Łódź, PL-90236 Lodz, Poland, 11Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 12Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 13Deutsches Elektronen-Synchrotron, 14ETH Zurich, CH-8093 Switzerland, 15IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 16Max-Planck-Institut für Physik, D-80805 München, Germany, 17ETH Zurich, CH-8093 Switzerland, 18INAF National Institute for Astrophysics, I-00136 Rome, Italy, 19Max-Planck-Institut für Physik, D-80805 München, Germany, 20ETH Zurich, CH-8093 Switzerland, 21Universität Würzburg, D-97074 Würzburg, Germany, 22Universitat de Barcelona, 23Max-Planck-Institut für Physik, D-80805 München, Germany, 24INAF National Institute for Astrophysics, I-00136 Rome, Italy, 25Max-Planck-Institut für Physik, D-80805 München, Germany, 26Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 27Universidad Complutense, E-28040 Madrid, Spain, 28IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 29Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 30INAF National Institute for Astrophysics, I-00136 Rome, Italy, 31Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 32Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 33Institut de Ciències de l'Espai, 34Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 35Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 36Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 37Technische Universität Dortmund, D-44221 Dortmund, Germany, 38Inst. de Astrofísica de Andalucía, 39Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 40ETH Zurich, CH-8093 Switzerland, 41Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain, 42Universität Würzburg, D-97074 Würzburg, Germany, 43Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 44Universidad Complutense, E-28040 Madrid, Spain, 45Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain, 46Max-Planck-Institut für Physik, D-80805 München, Germany, 47Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 48Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 49Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain, 50IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 51Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 52Institut de Ciències de l'Espai, 53Max-Planck-Institut für Physik, D-80805 München, Germany, 54Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 55ETH Zurich, CH-8093 Switzerland, 56Universität Würzburg, D-97074 Würzburg, Germany, 57Max-Planck-Institut für Physik, D-80805 München, Germany, 58Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 59ETH Zurich, CH-8093 Switzerland, 60Max-Planck-Institut für Physik, D-80805 München, Germany, 61IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 62ETH Zurich, CH-8093 Switzerland, 63Max-Planck-Institut für Physik, D-80805 München, Germany, 64INAF National Institute for Astrophysics, I-00136 Rome, Italy, 65Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 66Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 67Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 68Università di Padova and INFN, I-35131 Padova, Italy, 69Universidad Complutense, E-28040 Madrid, Spain, 70ETH Zurich, CH-8093 Switzerland, 71Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria, 72Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria, 73Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 74Universität Würzburg, D-97074 Würzburg, Germany, 75INAF National Institute for Astrophysics, I-00136 Rome, Italy, 76Università di Padova and INFN, I-35131 Padova, Italy, 77IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 78IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 79Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 80Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 81Max-Planck-Institut für Physik, D-80805 München, Germany, 82Max-Planck-Institut für Physik, D-80805 München, Germany, 83Universitat de Barcelona, 84IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 85Universitat de Barcelona, 86Universidad Complutense, E-28040 Madrid, Spain, 87Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 88Max-Planck-Institut für Physik, D-80805 München, Germany, 89Universidad Complutense, E-28040 Madrid, Spain, 90Università di Padova and INFN, I-35131 Padova, Italy, 91Max-Planck-Institut für Physik, D-80805 München, Germany, 92Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 93Universidad Complutense, E-28040 Madrid, Spain, 94Universitat de Barcelona, 95Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 96Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 97ETH Zurich, CH-8093 Switzerland, 98IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 99Università di Udine, and INFN Trieste, I-33100 Udine, Italy, 100Università di Padova and INFN, I-35131 Padova, Italy, 101Università dell'Insubria, Como, I-22100 Como, Italy, 102Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, 103Inst. de Astrofísica de Andalucía, 104Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy, 105Università di Padova and INFN, I-35131 Padova, Italy, 106Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 107IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 108Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 109Technische Universität Dortmund, D-44221 Dortmund, Germany, 110Universitat de Barcelona, 111ICREA, E-08010 Barcelona, Spain, 112Universität Würzburg, D-97074 Würzburg, Germany, 113Università di Padova and INFN, I-35131 Padova, Italy, 114Max-Planck-Institut für Physik, D-80805 München, Germany, 115Max-Planck-Institut für Physik, D-80805 München, Germany, 116INAF National Institute for Astrophysics, I-00136 Rome, Italy, 117Deutsches Elektronen-Synchrotron, 118Università di Padova and INFN, I-35131 Padova, Italy, 119Universidad Complutense, E-28040 Madrid, Spain, 120Università di Padova and INFN, I-35131 Padova, Italy, 121Max-Planck-Institut für Physik, D-80805 München, Germany, 122Max-Planck-Institut für Physik, D-80805 München, Germany, 123Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy, 124Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 125University of Łódź, PL-90236 Lodz, Poland, 126University of Łódź, PL-90236 Lodz, Poland, 127Universität Würzburg, D-97074 Würzburg, Germany, 128INAF National Institute for Astrophysics, I-00136 Rome, Italy, 129Università di Siena, and INFN Pisa, I-53100 Siena, Italy, 130Max-Planck-Institut für Physik, D-80805 München, Germany, 131Universität Würzburg, D-97074 Würzburg, Germany, 132Technische Universität Dortmund, D-44221 Dortmund, Germany, 133Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 134Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, 135Max-Planck-Institut für Physik, D-80805 München, Germany, 136INAF National Institute for Astrophysics, I-00136 Rome, Italy, 137Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria, 138Croatian MAGIC Consortium, Institute R. Boskovic, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia, 139Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy, 140Max-Planck-Institut für Physik, D-80805 München, Germany, 141Technische Universität Dortmund, D-44221 Dortmund, Germany, 142Universität Würzburg, D-97074 Würzburg, Germany, 143ICREA, E-08010 Barcelona, Spain, 144Università dell'Insubria, Como, I-22100 Como, Italy, 145Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria, 146ETH Zurich, CH-8093 Switzerland, 147Max-Planck-Institut für Physik, D-80805 München, Germany, 148ETH Zurich, CH-8093 Switzerland, 149Universitat de Barcelona, 150Inst. de Astrofísica de Andalucía, 151IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain, 152Inst. de Astrofísica de Andalucía, 153Stanford Linear Accelerator Center, Stanford, California, USA, 154Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California, USA, 155Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California, USA

We report the results of the observation of the nearby satellite galaxy Segue 1 performed by the MAGIC-I ground-based gamma-ray telescope between November 2008 and March 2009 for a total of 43.2 hours. No significant gamma-ray emission was found above the background. Read More

Experiments designed to measure neutrino oscillations also provide major opportunities for discovering very weakly coupled states. In order to produce neutrinos, experiments such as LSND collide thousands of Coulombs of protons into fixed targets, while MINOS and MiniBooNE also focus and then dump beams of muons. The neutrino detectors beyond these beam dumps are therefore an excellent arena in which to look for long-lived pseudoscalars or for vector bosons that kinetically mix with the photon. Read More

We use new kinematic data from the ultra-faint Milky Way satellite Segue 1 to model its dark matter distribution and derive upper limits on the dark matter annihilation cross-section. Using gamma-ray flux upper limits from the Fermi satellite and MAGIC, we determine cross-section exclusion regions for dark matter annihilation into a variety of different particles including charged leptons. We show that these exclusion regions are beginning to probe the regions of interest for a dark matter interpretation of the electron and positron fluxes from PAMELA, Fermi, and HESS, and that future observations of Segue 1 have strong prospects for testing such an interpretation. Read More

TeV-mass dark matter charged under a new GeV-scale gauge force can explain electronic cosmic-ray anomalies. We propose that the CoGeNT and DAMA direct detection experiments are observing scattering of light stable states -- "GeV-Matter" -- that are charged under this force and constitute a small fraction of the dark matter halo. Dark higgsinos in a supersymmetric dark sector are natural candidates for GeV-Matter that scatter off protons with a universal cross-section of 5 x 10^{-38} cm^2 and can naturally be split by 10-30 keV so that their dominant interaction with protons is down-scattering. Read More

Investigation at a $\phi$--factory can shed light on several debated issues in particle physics. We discuss: i) recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled kaon states, iii) the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta$^\prime$ mesons, iv) the contribution to understand the nature of light scalar mesons, and v) the opportunity to search for narrow di-lepton resonances suggested by recent models proposing a hidden dark-matter sector. We also report on the $e^+ e^-$ physics in the continuum with the measurements of (multi)hadronic cross sections and the study of gamma gamma processes. Read More

2010Jan
Authors: The Fermi LAT Collaboration, A. A. Abdo, M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. Brigida, P. Bruel, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, C. Cecchi, O. C. Elik, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, C. D. Dermer, A. de Angelis, F. de Palma, S. W. Digel, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora, Y. Edmonds, R. Essig, C. Farnier, C. Favuzzi, S. J. Fegan, W. B. Focke, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, L. Guillemot, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, D. Horan, R. E. Hughes, M. S. Jackson, G. J . ohannesson, A. S. Johnson, R. P. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, J. Kno . dlseder, M. Kuss, J. Lande, L. Latronico, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, J. E. McEnery, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, S. Rainó, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Ripken, S. Ritz, A. Y. Rodriguez, M. Roth, H. F. -W. Sadrozinski, A. Sander, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, A. Sellerholm, C. Sgró, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, J. -L. Starck, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, L. Tibaldo, D. F. Torres, Y. Uchiyama, T. L. Usher, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, T. Ylinen, M. Ziegler

Dark matter (DM) particle annihilation or decay can produce monochromatic $\gamma$-rays readily distinguishable from astrophysical sources. $\gamma$-ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a $\gamma$-ray line analysis, and integrated over most of the sky. We obtain $\gamma$-ray line flux upper limits in the range $0. Read More

We describe an experiment to search for a new vector boson A' with weak coupling alpha' > 6 x 10^{-8} alpha to electrons (alpha=e^2/4pi) in the mass range 65 MeV < m_A' < 550 MeV. New vector bosons with such small couplings arise naturally from a small kinetic mixing of the "dark photon" A' with the photon -- one of the very few ways in which new forces can couple to the Standard Model -- and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the trident e+e- spectrum. Read More

We explore calculable models with low-energy supersymmetry where the flavor hierarchy is generated by quark and lepton compositeness, and where the composites emerge from the same sector that dynamically breaks supersymmetry. The observed pattern of Standard Model fermion masses and mixings is obtained by identifying the various generations with composites of different dimension in the ultraviolet. These "single-sector" supersymmetry breaking models give rise to various spectra of soft masses which are, in many cases, quite distinct from what is commonly found in models of gauge or gravity mediation. Read More

Fixed-target experiments are ideally suited for discovering new MeV-GeV mass U(1) gauge bosons through their kinetic mixing with the photon. In this paper, we identify the production and decay properties of new light gauge bosons that dictate fixed-target search strategies. We summarize existing limits and suggest five new experimental approaches that we anticipate can cover most of the natural parameter space, using currently operating GeV-energy beams and well-established detection methods. Read More

A dark sector -- a new non-Abelian gauge group Higgsed or confined near the GeV scale -- can be spectacularly probed in low-energy e+e- collisions. A low-mass dark sector can explain the annual modulation signal reported by DAMA/LIBRA and the PAMELA, ATIC, and INTEGRAL observations by generating small mass splittings and new interactions for weak-scale dark matter. Some of these observations may be the first signs of a low-mass dark sector that collider searches can definitively confirm. Read More