# M. R. Pennington - Centre for Particle Theory, University of Durham, Durham, UniversityK

## Contact Details

NameM. R. Pennington |
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AffiliationCentre for Particle Theory, University of Durham, Durham, UniversityK |
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Location |
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## Pubs By Year |
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## Pub CategoriesHigh Energy Physics - Phenomenology (38) Nuclear Theory (22) High Energy Physics - Experiment (11) Nuclear Experiment (7) High Energy Physics - Theory (5) High Energy Physics - Lattice (2) Physics - Instrumentation and Detectors (2) Quantitative Biology - Cell Behavior (1) Nonlinear Sciences - Pattern Formation and Solitons (1) Quantitative Biology - Molecular Networks (1) Quantum Physics (1) Physics - Soft Condensed Matter (1) |

## Publications Authored By M. R. Pennington

With the introduction of a spectral representation, the Schwinger-Dyson equation (SDE) for the fermion propagator is formulated in Minkowski space in QED. After imposing the on-shell renormalization conditions, analytic solutions for the fermion propagator spectral functions are obtained in four dimensions with a renormalizable version of the Gauge Technique anzatz for the fermion-photon vertex in the quenched approximation in the Landau gauge. Despite the limitations of this model, having an explicit solution provides a guiding example of the fermion propagator with the correct analytic structure. Read More

**Authors:**GlueX Collaboration, H. Al Ghoul, E. G. Anassontzis, A. Austregesilo, F. Barbosa, A. Barnes, T. D. Beattie, D. W. Bennett, V. V. Berdnikov, T. Black, W. Boeglin, W. J. Briscoe, W. K. Brooks, B. E. Cannon, O. Chernyshov, E. Chudakov, V. Crede, M. M. Dalton, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, R. Dzhygadlo, H. Egiyan, P. Eugenio, C. Fanelli, A. M. Foda, J. Frye, S. Furletov, L. Gan, A. Gasparian, A. Gerasimov, N. Gevorgyan, K. Goetzen, V. S. Goryachev, L. Guo, H. Hakobyan, J. Hardin, A. Henderson, G. M. Huber, D. G. Ireland, M. M. Ito, N. S. Jarvis, R. T. Jones, V. Kakoyan, M. Kamel, F. J. Klein, R. Kliemt, C. Kourkoumeli, S. Kuleshov, I. Kuznetsov, M. Lara, I. Larin, D. Lawrence, W. I. Levine, K. Livingston, G. J. Lolos, V. Lyubovitskij, D. Mack, P. T. Mattione, V. Matveev, M. McCaughan, M. McCracken, W. McGinley, J. McIntyre, R. Mendez, C. A. Meyer, R. Miskimen, R. E. Mitchell, F. Mokaya, K. Moriya, F. Nerling, G. Nigmatkulov, N. Ochoa, A. I. Ostrovidov, Z. Papandreou, M. Patsyuk, R. Pedroni, M. R. Pennington, L. Pentchev, K. J. Peters, E. Pooser, B. Pratt, Y. Qiang, J. Reinhold, B. G. Ritchie, L. Robison, D. Romanov, C. Salgado, R. A. Schumacher, C. Schwarz, J. Schwiening, A. Yu. Semenov, I. A. Semenova, K. K. Seth, M. R. Shepherd, E. S. Smith, D. I. Sober, A. Somov, S. Somov, O. Soto, N. Sparks, M. J. Staib, J. R. Stevens, I. I. Strakovsky, A. Subedi, V. Tarasov, S. Taylor, A. Teymurazyan, I. Tolstukhin, A. Tomaradze, A. Toro, A. Tsaris, G. Vasileiadis, I. Vega, N. K. Walford, D. Werthmuller, T. Whitlatch, M. Williams, E. Wolin, T. Xiao, J. Zarling, Z. Zhang, B. Zihlmann, V. Mathieu, J. Nys

**Category:**Nuclear Experiment

We report measurements of the photon beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\to p\pi^0$ and $\vec{\gamma}p\to p\eta $ from the GlueX experiment using a 9 GeV linearly-polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous $\pi^0$ measurements and are the first $\eta$ measurements in this energy regime. The results are compared with theoretical predictions based on $t$-channel, quasi-particle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models. Read More

A recent analysis of data on the two photon production of the $\eta_c$ and its decay to $K(K\pi)$ has determined the $K\pi$ $S$-wave amplitude in a "model-independent" way assuming primarily that the additional kaon is a spectator in this decay. The purpose of this paper is to fit these results, together with classic $K\pi$ production data from LASS, within a formalism that implements unitarity for the di-meson interaction. This fixes the $I=1/2$ $K\pi\to K\pi$ $S$-wave amplitude up to 2. Read More

Light-by-light scattering sumrules based on general field theory principles relate cross-sections with different helicities. In this paper the simplest sumrule is tested for the $I=0$ and $2$ channels for "real" photon-photon collisions. Important contributions come from the long-lived pseudoscalar mesons and from di-meson intermediate states. Read More

We present results for pion polarizabilities predicted using dispersion relations from our earlier Amplitude Analysis of world data on two photon production of meson pairs. The helicity-zero polarizabilities are rather stable and insensitive to uncertainties in cross-channel exchanges. The need is first to confirm the recent result on $(\alpha_1-\beta_1)$ for the charged pion by COMPASS at CERN to an accuracy of 10\% by measuring the $\gamma\gamma\to\pi^+\pi^-$ cross-section to an uncertainty of ~1\%. Read More

We derive the gauge covariance requirement imposed on the QED fermion-photon three-point function within the framework of a spectral representation for fermion propagators. When satisfied, such requirement ensures solutions to the fermion propagator Schwinger-Dyson equation (SDE) in any covariant gauge with arbitrary numbers of spacetime dimensions to be consistent with the Landau-Khalatnikov-Fradkin transformation (LKFT). The general result has been verified by the special cases of three and four dimensions. Read More

We explore the dependence of fermion propagators on the covariant gauge fixing parameter in quantum electrodynamics (QED) with the number of spacetime dimensions kept explicit. Gauge covariance is controlled by the the Landau-Khalatnikov-Fradkin transformation (LKFT). Utilizing its group nature, the LKFT for a fermion propagator in Minkowski space is solved exactly. Read More

Any practical application of the Schwinger-Dyson equations to the study of $n$-point Green's functions of a field theory requires truncations, the best known being finite order perturbation theory. Strong coupling studies require a different approach. In the case of QED, gauge covariance is a powerful constraint. Read More

**Authors:**M. Albrow, M. Amaryan, E. Chudakov, P. Degtyarenko, A. Feijoo, C. Fernandez-Ramirez, I. P. Fernando, A. Filippi, J. L. Goity, H. Haberzettl, B. C. Jackson, H. Kamano, C. Keith, M. Kohl, I. Larin, Wei-Hong Liang, V. K. Magas, M. Mai, D. M. Manley, V. Mathieu, F. Myhrer, K. Nakayama, H. Noumi, Y. Oh, H. Ohnishi, E. Oset, M. Pennington, A. Ramos, D. Richards, E. Santopinto, R. Schumacher, A. Szczepaniak, S. Taylor, B. Wojtsekhowski, Ju-Jun Xie, V. Ziegler, B. Zou

The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main focus on the physics of excited hyperons produced by the Kaon beam on unpolarized and polarized targets with GlueX setup in Hall D. Such studies will broaden a physics program of hadron spectroscopy extending it to the strange sector. The Workshop was organized to get a feedback from the community to strengthen physics motivation of the LoI and prepare a full proposal. Read More

Once upon a time, the world was simple: the proton contained three quarks, two {\it ups} and a {\it down}. How these give the proton its mass and its spin seemed obvious. Over the past forty years the proton has become more complicated, and how even these most obvious of its properties is explained in a universe of quarks, antiquarks and gluons remains a challenge. Read More

**Authors:**The GlueX Collaboration, H. Al Ghoul, E. G. Anassontzis, F. Barbosa, A. Barnes, T. D. Beattie, D. W. Bennett, V. V. Berdnikov, T. Black, W. Boeglin, W. K. Brooks, B. Cannon, O. Chernyshov, E. Chudakov, V. Crede, M. M. Dalton, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, H. Egiyan, P. Eugenio, A. M. Foda, J. Frye, S. Furletov, L. Gan, A. Gasparian, A. Gerasimov, N. Gevorgyan, V. S. Goryachev, B. Guegan, L. Guo, H. Hakobyan, H. Hakobyan2, J. Hardin, G. M. Huber, D. Ireland, M. M. Ito, N. S. Jarvis, R. T. Jones, V. Kakoyan, M. Kamel, F. J. Klein, C. Kourkoumeli, S. Kuleshov, M. Lara, I. Larin, D. Lawrence, J. Leckey, W. I. Levine, K. Livingston, G. J. Lolos, D. Mack, P. T. Mattione, V. Matveev, M. McCaughan, W. McGinley, J. McIntyre, R. Mendez, C. A. Meyer, R. Miskimen, R. E. Mitchell, F. Mokaya, K. Moriya, G. Nigmatkulov, N. Ochoa, A. I. Ostrovidov, Z. Papandreou, R. Pedroni, M. Pennington, L. Pentchev, A. Ponosov, E. Pooser, B. Pratt, Y. Qiang, J. Reinhold, B. G. Ritchie, L. Robison, D. Romanov, C. Salgado, R. A. Schumacher, A. Yu. Semenov, I. A. Semenova, I. Senderovich, K. K. Seth, M. R. Shepherd, E. S. Smith, D. I. Sober, A. Somov, S. Somov, O. Soto, N. Sparks, M. J. Staib, J. R. Stevens, A. Subedi, V. Tarasov, S. Taylor, I. Tolstukhin, A. Tomaradze, A. Toro, A. Tsaris, G. Vasileiadis, I. Vega, G. Voulgaris, N. K. Walford, T. Whitlatch, M. Williams, E. Wolin, T. Xiao, J. Zarling, B. Zihlmann

The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissioned. All of the detector systems are now performing at or near design specifications and events are being fully reconstructed, including exclusive production of $\pi^{0}$, $\eta$ and $\omega$ mesons. Read More

**Authors:**Matthias F. M. Lutz, Jens Sören Lange, Michael Pennington, Diego Bettoni, Nora Brambilla, Volker Crede, Simon Eidelman, Albrecht Gillitzer, Wolfgang Gradl, Christian B. Lang, Volker Metag, Juan Nieves, Sebastian Neubert, Makoto Oka, Steve L. Olsen, Marco Pappagallo, Stephan Paul, Marc Pelizäus, Alessandro Pilloni, Elisabetta Prencipe, Jim Ritman, Sinead Ryan, Ulrike Thoma, Ulrich Uwer, Wolfram Weise

**Category:**High Energy Physics - Phenomenology

We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with ${\it up}$, ${\it down}$ and ${\it strange}$ quark content were considered. Read More

**Authors:**R. A. Briceno, T. D. Cohen, S. Coito, J. J. Dudek, E. Eichten, C. S. Fischer, M. Fritsch, W. Gradl, A. Jackura, M. Kornicer, G. Krein, R. F. Lebed, F. A. Machado, R. E. Mitchell, C. J. Morningstar, M. Peardon, M. R. Pennington, K. Peters, J. -M. Richard, C. -P. Shen, M. R. Shepherd, T. Skwarnicki, E. S. Swanson, A. P. Szczepaniak, C. -Z. Yuan

The last few years have been witness to a proliferation of new results concerning heavy exotic hadrons. Experimentally, many new signals have been discovered that could be pointing towards the existence of tetraquarks, pentaquarks, and other exotic configurations of quarks and gluons. Theoretically, advances in lattice field theory techniques place us at the cusp of understanding complex coupled-channel phenomena, modelling grows more sophisticated, and effective field theories are being applied to an ever greater range of situations. Read More

We study the phase separation of binary lipid mixtures that form bicontinuous cubic phases. The competition between non-uniform Gaussian membrane curvature and line tension leads to a very rich phase diagram, where we observe symmetry breaking of the membrane morphologies and reentrant phenomena due to the formation of bridges between segregated domains. Upon increasing the line tension contribution, we also find facetting of lipid domains that we explain using a simple argument based on the symmetry of the underlying surface and topology. Read More

It has long been expected that the spectrum of hadrons in QCD would be far richer and extensive than experiment has so far revealed. While there have been experimental hints of this richness for some time, it is really only in the last few years that dramatic progress has been seen in the exploration both experimentally and in calculations on the lattice. Precision studies enabled by new technology both with detectors and high performance computations are converging on an understanding of the spectrum in strong coupling QCD. Read More

We compare the low-energy partial wave analyses $\pi N$ scattering with a high-energy data via finite energy sum rules. We construct a new set of amplitudes by matching the imaginary part from the low-energy analysis with the high-energy, Regge parametrization and reconstruct the real parts using dispersion relations. Read More

Once upon a time, the picture of hadrons was of mesons made of a quark and an antiquark, and baryons of three quarks. Though hadrons heavier than the ground states inevitably decay by the strong interaction, the successes of the quark model might suggest their decays are a mere perturbation. However, Eef van Beveren, whose career we celebrate here, recognised that decays are an integral part of the life of a hadron. Read More

We apply the generalized Veneziano model ($B_5$ model) in the double-Regge exchange limit to the $\gamma p \to K^+ K^- p$ reaction. Four different cases defined by the possible combinations of the signature factors of leading Regge exchanges (($K^*,a_2/f_2$), ($K^*,\rho/\omega$), ($K_2^*,a_2/f_2$), and ($K_2^*,\rho/\omega$)) have been simulated through the Monte Carlo method. Suitable event candidates for the double-Regge exchange high-energy limit were selected employing \textit{Van Hove} plots as a better alternative to kinematical cuts in the $K^+ K^- p$ Dalitz plot. Read More

We present a comprehensive numerical study of dynamical mass generation for unquenched QED in four dimensions, in the absence of four-fermion interactions, using the Dyson--Schwinger approach. We begin with an overview of previous investigations of criticality in the quenched approximation. To this we add an analysis using a new fermion-antifermion-boson interaction ansatz, the Kizilersu-Pennington (KP) vertex, developed for an unquenched treatment. Read More

**Authors:**The GlueX Collaboration, M. Dugger, B. Ritchie, I. Senderovich, E. Anassontzis, P. Ioannou, C. Kourkoumeli, G. Vasileiadis, G. Voulgaris, N. Jarvis, W. Levine, P. Mattione, W. McGinley, C. A. Meyer, R. Schumacher, M. Staib, F. Klein, D. Sober, N. Sparks, N. Walford, D. Doughty, A. Barnes, R. Jones, J. McIntyre, F. Mokaya, B. Pratt, W. Boeglin, L. Guo, E. Pooser, J. Reinhold, H. Al Ghoul, V. Crede, P. Eugenio, A. Ostrovidov, A. Tsaris, D. Ireland, K. Livingston, D. Bennett, J. Bennett, J. Frye, M. Lara, J. Leckey, R. Mitchell, K. Moriya, M. R. Shepherd, O. Chernyshov, A. Dolgolenko, A. Gerasimov, V. Goryachev, I. Larin, V. Matveev, V. Tarasov, F. Barbosa, E. Chudakov, M. Dalton, A. Deur, J. Dudek, H. Egiyan, S. Furletov, M. Ito, D. Mack, D. Lawrence, M. McCaughan, M. Pennington, L. Pentchev, Y. Qiang, E. Smith, A. Somov, S. Taylor, T. Whitlatch, B. Zihlmann, R. Miskimen, B. Guegan, J. Hardin, J. Stevens, M. Williams, V. Berdnikov, G. Nigmatkulov, A. Ponosov, D. Romanov, S. Somov, I. Tolstukhin, C. Salgado, P. Ambrozewicz, A. Gasparian, R. Pedroni, T. Black, L. Gan, S. Dobbs, K. Seth, X. Ting, A. Tomaradze, T. Beattie, G. Huber, G. Lolos, Z. Papandreou, A. Semenov, I. Semenova, W. Brooks, H. Hakobyan, S. Kuleshov, O. Soto, A. Toro, I. Vega, N. Gevorgyan, H. Hakobyan, V. Kakoyan

We propose to enhance the kaon identification capabilities of the GlueX detector by constructing an FDIRC (Focusing Detection of Internally Reflected Cherenkov) detector utilizing the decommissioned BaBar DIRC components. The GlueX FDIRC would significantly enhance the GlueX physics program by allowing one to search for and study hybrid mesons decaying into kaon final states. Such systematic studies of kaon final states are essential for inferring the quark flavor content of hybrid and conventional mesons. Read More

**Authors:**Maurice Benayoun, Johan Bijnens, Tom Blum, Irinel Caprini, Gilberto Colangelo, Henryk Czyż, Achim Denig, Cesareo A. Dominguez, Simon Eidelman, Christian S. Fischer, Paolo Gauzzi, Yuping Guo, Andreas Hafner, Masashi Hayakawa, Gregorio Herdoiza, Martin Hoferichter, Guangshun Huang, Karl Jansen, Fred Jegerlehner, Benedikt Kloss, Bastian Kubis, Zhiqing Liu, William Marciano, Pere Masjuan, Harvey B. Meyer, Tsutomu Mibe, Andreas Nyffeler, Vladimir Pascalutsa, Vladyslav Pauk, Michael R. Pennington, Santiago Peris, Christoph F. Redmer, Pablo Sanchez-Puertas, Boris Shwartz, Evgeny Solodov, Dominik Stoeckinger, Thomas Teubner, Marc Unverzagt, Marc Vanderhaeghen, Magnus Wolke

We present the mini-proceedings of the workshops Hadronic contributions to the muon anomalous magnetic moment: strategies for improvements of the accuracy of the theoretical prediction and $(g-2)_{\mu}$: Quo vadis?, both held in Mainz from April 1$^{\rm rst}$ to 5$^{\rm th}$ and from April 7$^{\rm th}$ to 10$^{\rm th}$, 2014, respectively. Read More

**Authors:**A. J. Bevan, B. Golob, Th. Mannel, S. Prell, B. D. Yabsley, K. Abe, H. Aihara, F. Anulli, N. Arnaud, T. Aushev, M. Beneke, J. Beringer, F. Bianchi, I. I. Bigi, M. Bona, N. Brambilla, J. B rodzicka, P. Chang, M. J. Charles, C. H. Cheng, H. -Y. Cheng, R. Chistov, P. Colangelo, J. P. Coleman, A. Drutskoy, V. P. Druzhinin, S. Eidelman, G. Eigen, A. M. Eisner, R. Faccini, K. T . Flood, P. Gambino, A. Gaz, W. Gradl, H. Hayashii, T. Higuchi, W. D. Hulsbergen, T. Hurth, T. Iijima, R. Itoh, P. D. Jackson, R. Kass, Yu. G. Kolomensky, E. Kou, P. Križan, A. Kronfeld, S. Kumano, Y. J. Kwon, T. E. Latham, D. W. G. S. Leith, V. Lüth, F. Martinez-Vidal, B. T. Meadows, R. Mussa, M. Nakao, S. Nishida, J. Ocariz, S. L. Olsen, P. Pakhlov, G. Pakhlova, A. Palano, A. Pich, S. Playfer, A. Poluektov, F. C. Porter, S. H. Robertson, J. M. Roney, A. Roodman, Y. Sakai, C. Schwanda, A. J. Schwartz, R. Seidl, S. J. Sekula, M. Steinhauser, K. Sumisawa, E. S. Swanson, F. Tackmann, K. Trabelsi, S. Uehara, S. Uno, R. van der Water, G. Vasseur, W. Verkerke, R. Waldi, M. Z. Wang, F. F. Wilson, J. Zupan, A. Zupanc, I. Adachi, J. Albert, Sw. Banerjee, M. Bellis, E. Ben-Haim, P. Biassoni, R. N. Cahn, C. Cartaro, J. Chauveau, C. Chen, C. C. Chiang, R. Cowan, J. Dalseno, M. Davier, C. Davies, J. C. Dingfelder, B. Eche nard, D. Epifanov, B. G. Fulsom, A. M. Gabareen, J. W. Gary, R. Godang, M. T. Graham, A. Hafner, B. Hamilton, T. Hartmann, K. Hayasaka, C. Hearty, Y. Iwasaki, A. Khodjamirian, A. Kusaka, A. Kuzmin, G. D. Lafferty, A. Lazzaro, J. Li, D. Lindemann, O. Long, A. Lusiani, G. Marchiori, M. Martinelli, K. Miyabayashi, R. Mizuk, G. B. Mohanty, D. R. Muller, H. Nakazawa, P. Ongmongkolkul, S. Pacetti, F. Palombo, T. K. Pedlar, L. E. Piilonen, A. Pilloni, V. Poireau, K. Prothmann, T. Pulliam, M. Rama, B. N. Ratcliff, P. Roudeau, S. Schrenk, T. Schroeder, K. R. Schubert, C. P. Shen, B. Shwartz, A. Soffer, E. P. Solodov, A. Somov, M. Starič, S. Stracka, A. V. Telnov, K. Yu. Todyshev, T. Tsuboyama, T. Uglov, A. Vinokurova, J. J. Walsh, Y. Watanabe, E. Won, G. Wormser, D. H. Wright, S. Ye, C. C. Zhang, S. Abachi, A. Abashian, K. Abe, K. Abe, N. Abe, R. Abe, T. Abe, T. Abe, G. S. Abrams, I. Adam, K. Adamczyk, A. Adametz, T. Adye, A. Agarwal, H. Ahmed, M. Ahmed, S. Ahmed, B. S. Ahn, H. S. Ahn, I. J. R. Aitchison, K. Akai, S. Akar, M. Akatsu, M. Akemoto, R. Akhmetshin, R. Akre, M. S. Alam, J. N. Albert, R. Aleksan, J. P. Alexander, G. Alimonti, M. T. Allen, J. Allison, T. Allmendinger, J. R. G. Alsmiller, D. Altenburg, K. E. Alwyn, Q. An, J. Anderson, R. Andreassen, D. Andreotti, M. Andreotti, J. C. Andress, C. Angelini, D. Anipko, A. Anjomshoaa, P. L. Anthony, E. A. Antillon, E. Antonioli, K. Aoki, J. F. Arguin, K. Arinstein, K. Arisaka, K. Asai, M. Asai, Y. Asano, D. J. Asgeirsson, D. M. Asner, T. Aso, M. L. Aspinwall, D. Aston, H. Atmacan, B. Aubert, V. Aulchenko, R. Ayad, T. Azemoon, T. Aziz, V. Azzolini, D. E. Azzopardi, M. A. Baak, J. J. Back, S. Bagnasco, S. Bahinipati, D. S. Bailey, S. Bailey, P. Bailly, N. van Bakel, A. M. Bakich, A. Bala, V. Balagura, R. Baldini-Ferroli, Y. Ban, E. Banas, H. R. Band, S. Banerjee, E. Baracchini, R. Barate, E. Barberio, M. Barbero, D. J. Bard, T. Barillari, N. R. Barlow, R. J. Barlow, M. Barrett, W. Bartel, J. Bartelt, R. Bartoldus, G. Batignani, M. Battaglia, J. M. Bauer, A. Bay, M. Beaulieu, P. Bechtle, T. W. Beck, J. Becker, J. Becla, I. Bedny, S. Behari, P. K. Behera, E. Behn, L. Behr, C. Beigbeder, D. Beiline, R. Bell, F. Bellini, G. Bellodi, K. Belous, M. Benayoun, G. Benelli, J. F. Benitez, M. Benkebil, N. Berger, J. Bernabeu, D. Bernard, R. Bernet, F. U. Bernlochner, J. W. Berryhill, K. Bertsche, P. Besson, D. S. Best, S. Bettarini, D. Bettoni, V. Bhardwaj, W. Bhimji, B. Bhuyan, B. Bhuyan, M. E. Biagini, M. Biasini, K. van Bibber, J. Biesiada, I. Bingham, R. M. Bionta, M. Bischofberger, U. Bitenc, I. Bizjak, F. Blanc, G. Blaylock, V. E. Blinov, E. Bloom, P. C. Bloom, N. L. Blount, J. Blouw, M. Bly, S. Blyth, C. T. Boeheim, M. Bomben, A. Bondar, M. Bondioli, G. R. Bonneaud, G. Bonvicini, M. Booke, J. Booth, C. Borean, A. W. Borgland, E. Borsato, F. Bosi, L. Bosisio, A. A. Botov, J. Bougher, K. Bouldin, P. Bourgeois, D. Boutigny, D. A. Bowerman, A. M. Boyarski, R. F. Boyce, J. T. Boyd, A. Bozek, C. Bozzi, M. Bračko, G. Brandenburg, T. Brandt, B. Brau, J. Brau, A. B. Breon, D. Breton, C. Brew, H. Briand, P. G. Bright-Thomas, V. Brigljević, D. I. Britton, F. Brochard, B. Broomer, J. Brose, T. E. Browder, C. L. Brown, C. M. Brown, D. N. Brown, D. N. Brown, M. Browne, M. Bruinsma, S. Brunet, F. Bucci, C. Buchanan, O. L. Buchmueller, C. Bünger, W. Bugg, A. D. Bukin, R. Bula, H. Bulten, P. R. Burchat, W. Burgess, J. P. Burke, J. Button-Shafer, A. R. Buzykaev, A. Buzzo, Y. Cai, R. Calabrese, A. Calcaterra, G. Calderini, B. Camanzi, E. Campagna, C. Campagnari, R. Capra, V. Carassiti, M. Carpinelli, M. Carroll, G. Casarosa, B. C. K. Casey, N. M. Cason, G. Castelli, N. Cavallo, G. Cavoto, A. Cecchi, R. Cenci, G. Cerizza, A. Cervelli, A. Ceseracciu, X. Chai, K. S. Chaisanguanthum, M. C. Chang, Y. H. Chang, Y. W. Chang, D. S. Chao, M. Chao, Y. Chao, E. Charles, C. A. Chavez, R. Cheaib, V. Chekelian, A. Chen, A. Chen, E. Chen, G. P. Chen, H. F. Chen, J. -H. Chen, J. C. Chen, K. F. Chen, P. Chen, S. Chen, W. T. Chen, X. Chen, X. R. Chen, Y. Q. Chen, B. Cheng, B. G. Cheon, N. Chevalier, Y. M. Chia, S. Chidzik, K. Chilikin, M. V. Chistiakova, R. Cizeron, I. S. Cho, K. Cho, V. Chobanova, H. H. F. Choi, K. S. Choi, S. K. Choi, Y. Choi, Y. K. Choi, S. Christ, P. H. Chu, S. Chun, A. Chuvikov, G. Cibinetto, D. Cinabro, A. R. Clark, P. J. Clark, C. K. Clarke, R. Claus, B. Claxton, Z. C. Clifton, J. Cochran, J. Cohen-Tanugi, H. Cohn, T. Colberg, S. Cole, F. Colecchia, C. Condurache, R. Contri, P. Convert, M. R. Convery, P. Cooke, N. Copty, C. M. Cormack, F. Dal Corso, L. A. Corwin, F. Cossutti, D. Cote, A. Cotta Ramusino, W. N. Cottingham, F. Couderc, D. P. 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Potter, R. J. L. Potter, V. Prasad, E. Prebys, E. Prencipe, J. Prendki, R. Prepost, M. Prest, M. Prim, M. Pripstein, X. Prudent, S. Pruvot, E. M. T. Puccio, M. V. Purohit, N. D. Qi, H. Quinn, J. Raaf, R. Rabberman, F. Raffaelli, G. Ragghianti, S. Rahatlou, A. M. Rahimi, R. Rahmat, A. Y. Rakitin, A. Randle-Conde, P. Rankin, I. Rashevskaya, S. Ratkovsky, G. Raven, V. Re, M. Reep, J. J. Regensburger, J. Reidy, R. Reif, B. Reisert, C. Renard, F. Renga, S. Ricciardi, J. D. Richman, J. L. Ritchie, M. Ritter, C. Rivetta, G. Rizzo, C. Roat, P. Robbe, D. A. Roberts, A. I. Robertson, E. Robutti, S. Rodier, D. M. Rodriguez, J. L. Rodriguez, R. Rodriguez, N. A. Roe, M. Röhrken, W. Roethel, J. Rolquin, L. Romanov, A. Romosan, M. T. Ronan, G. Rong, F. J. Ronga, L. Roos, N. Root, M. Rosen, E. I. Rosenberg, A. Rossi, A. Rostomyan, M. Rotondo, E. Roussot, J. Roy, M. Rozanska, Y. Rozen, Y. Rozen, A. E. Rubin, W. O. Ruddick, A. M. Ruland, K. Rybicki, A. Ryd, S. Ryu, J. Ryuko, S. Sabik, R. Sacco, M. A. Saeed, F. Safai Tehrani, H. Sagawa, H. Sahoo, S. Sahu, M. Saigo, T. Saito, S. Saitoh, K. Sakai, H. Sakamoto, H. Sakaue, M. Saleem, A. A. Salnikov, E. Salvati, F. Salvatore, A. Samuel, D. A. Sanders, P. Sanders, S. Sandilya, F. Sandrelli, W. Sands, W. R. Sands, M. Sanpei, D. Santel, L. Santelj, V. Santoro, A. Santroni, T. Sanuki, T. R. Sarangi, S. Saremi, A. Sarti, T. Sasaki, N. Sasao, M. Satapathy, Nobuhiko Sato, Noriaki Sato, Y. Sato, N. Satoyama, A. Satpathy, V. Savinov, N. Savvas, O. H. Saxton, K. Sayeed, S. F. Schaffner, T. Schalk, S. Schenk, J. R. Schieck, T. Schietinger, C. J. Schilling, R. H. Schindler, S. Schmid, R. E. Schmitz, H. Schmuecker, O. Schneider, G. Schnell, P. Schönmeier, K. C. Schofield, G. Schott, H. Schröder, M. Schram, J. Schubert, J. Schümann, J. Schultz, B. A. Schumm, M. H. Schune, U. Schwanke, H. Schwarz, J. Schwiening, R. Schwierz, R. F. Schwitters, C. Sciacca, G. Sciolla, I. J. Scott, J. Seeman, A. Seiden, R. Seitz, T. Seki, A. I. Sekiya, S. Semenov, D. Semmler, S. Sen, K. Senyo, O. Seon, V. V. Serbo, S. I. Serednyakov, B. Serfass, M. Serra, J. Serrano, Y. Settai, R. Seuster, M. E. Sevior, K. V. Shakhova, L. Shang, M. Shapkin, V. Sharma, V. Shebalin, V. G. Shelkov, B. C. Shen, D. Z. Shen, Y. T. Shen, D. J. Sherwood, T. Shibata, T. A. Shibata, H. Shibuya, T. Shidara, K. Shimada, M. Shimoyama, S. Shinomiya, J. G. Shiu, H. W. Shorthouse, L. I. Shpilinskaya, A. Sibidanov, E. Sicard, A. Sidorov, V. Sidorov, V. Siegle, M. Sigamani, M. C. Simani, M. Simard, G. Simi, F. Simon, F. Simonetto, N. B. Sinev, H. Singh, J. B. Singh, R. Sinha, S. Sitt, Yu. I. Skovpen, R. J. Sloane, P. Smerkol, A. J. S. Smith, D. Smith, D. Smith, D. Smith, D. S. Smith, J. G. Smith, A. Smol, H. L. Snoek, A. Snyder, R. Y. So, R. J. Sobie, E. Soderstrom, A. Soha, Y. S. Sohn, M. D. Sokoloff, A. Sokolov, P. Solagna, E. Solovieva, N. Soni, P. Sonnek, V. Sordini, B. Spaan, S. M. Spanier, E. Spencer, V. Speziali, M. Spitznagel, P. Spradlin, H. Staengle, R. Stamen, M. Stanek, S. Stanič, J. Stark, M. Steder, H. Steininger, M. Steinke, J. Stelzer, E. Stevanato, A. Stocchi, R. Stock, H. Stoeck, D. P. Stoker, R. Stroili, D. Strom, P. Strother, J. Strube, B. Stugu, J. Stypula, D. Su, R. Suda, R. Sugahara, A. Sugi, T. Sugimura, A. Sugiyama, S. Suitoh, M. K. Sullivan, M. Sumihama, T. Sumiyoshi, D. J. Summers, L. Sun, L. Sun, S. Sun, J. E. Sundermann, H. F. Sung, Y. Susaki, P. Sutcliffe, A. Suzuki, J. Suzuki, J. I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, J. E. Swain, S. K. Swain, S. T'Jampens, M. Tabata, K. Tackmann, H. Tajima, O. Tajima, K. Takahashi, S. Takahashi, T. Takahashi, F. Takasaki, T. Takayama, M. Takita, K. Tamai, U. Tamponi, N. Tamura, N. Tan, P. Tan, K. Tanabe, T. Tanabe, H. A. Tanaka, J. Tanaka, M. Tanaka, S. Tanaka, Y. Tanaka, K. Tanida, N. Taniguchi, P. Taras, N. Tasneem, G. Tatishvili, T. Tatomi, M. Tawada, F. Taylor, G. N. Taylor, G. P. Taylor, V. I. Telnov, L. Teodorescu, R. Ter-Antonyan, Y. Teramoto, D. Teytelman, G. Thérin, Ch. Thiebaux, D. Thiessen, E. W. Thomas, J. M. Thompson, F. Thorne, X. C. Tian, M. Tibbetts, I. Tikhomirov, J. S. Tinslay, G. Tiozzo, V. Tisserand, V. Tocut, W. H. Toki, E. W. Tomassini, M. Tomoto, T. Tomura, E. Torassa, E. Torrence, S. Tosi, C. Touramanis, J. C. Toussaint, S. N. Tovey, P. P. Trapani, E. Treadwell, G. Triggiani, S. Trincaz-Duvoid, W. Trischuk, D. Troost, A. Trunov, K. L. Tsai, Y. T. Tsai, Y. Tsujita, K. Tsukada, T. Tsukamoto, J. M. Tuggle, A. Tumanov, Y. W. Tung, L. Turnbull, J. Turner, M. Turri, K. Uchida, M. Uchida, Y. Uchida, M. Ueki, K. Ueno, K. Ueno, N. Ujiie, K. A. Ulmer, Y. Unno, P. Urquijo, Y. Ushiroda, Y. Usov, M. Usseglio, Y. Usuki, U. Uwer, J. Va'vra, S. E. Vahsen, G. Vaitsas, A. Valassi, E. Vallazza, A. Vallereau, P. Vanhoefer, W. C. van Hoek, C. Van Hulse, D. van Winkle, G. Varner, E. W. Varnes, K. E. Varvell, G. Vasileiadis, Y. S. Velikzhanin, M. Verderi, S. Versillé, K. Vervink, B. Viaud, P. B. Vidal, S. Villa, P. Villanueva-Perez, E. L. Vinograd, L. Vitale, G. M. Vitug, C. Voß, C. Voci, C. Voena, A. Volk, J. H. von Wimmersperg-Toeller, V. Vorobyev, A. Vossen, G. Vuagnin, C. O. Vuosalo, K. Wacker, A. P. Wagner, D. L. Wagner, G. Wagner, M. N. Wagner, S. R. Wagner, D. E. Wagoner, D. Walker, W. Walkowiak, D. Wallom, C. C. Wang, C. H. Wang, J. Wang, J. G. Wang, K. Wang, L. Wang, L. L. Wang, P. Wang, P. Wang, T. J. Wang, W. F. Wang, X. L. Wang, Y. F. Wang, F. R. Wappler, M. Watanabe, A. T. Watson, J. E. Watson, N. K. Watson, M. Watt, J. H. Weatherall, M. Weaver, T. Weber, R. Wedd, J. T. Wei, A. W. Weidemann, A. J. R. Weinstein, W. A. Wenzel, C. A. West, C. G. West, T. J. West, E. White, R. M. White, J. Wicht, L. Widhalm, J. Wiechczynski, U. Wienands, L. Wilden, M. Wilder, D. C. Williams, G. Williams, J. C. Williams, K. M. Williams, M. I. Williams, S. Y. Willocq, J. R. Wilson, M. G. Wilson, R. J. Wilson, F. Winklmeier, L. O. Winstrom, M. A. Winter, W. J. Wisniewski, M. Wittgen, J. Wittlin, W. Wittmer, R. Wixted, A. Woch, B. J. Wogsland, E. Won, Q. K. Wong, B. C. Wray, A. C. Wren, D. M. Wright, C. H. Wu, J. Wu, S. L. Wu, H. W. Wulsin, S. M. Xella, Q. L. Xie, Y. Xie, Y. Xie, Z. Z. Xu, Ch. Yèche, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamaguchi, T. Yamaki, H. Yamamoto, N. Yamamoto, R. K. Yamamoto, S. Yamamoto, T. Yamanaka, H. Yamaoka, J. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, D. S. Yan, Y. Yan, H. Yanai, S. Yanaka, H. Yang, R. Yang, S. Yang, A. K. Yarritu, S. Yashchenko, J. Yashima, Z. Yasin, Y. Yasu, S. W. Ye, P. Yeh, J. I. Yi, K. Yi, M. Yi, Z. W. Yin, J. Ying, G. Yocky, K. Yokoyama, M. Yokoyama, T. Yokoyama, K. Yoshida, M. Yoshida, Y. Yoshimura, C. C. Young, C. X. Yu, Z. Yu, C. Z. Yuan, Y. Yuan, F. X. Yumiceva, Y. Yusa, A. N. Yushkov, H. Yuta, V. Zacek, S. B. Zain, A. Zallo, S. Zambito, D. Zander, S. L. Zang, D. Zanin, B. G. Zaslavsky, Q. L. Zeng, A. Zghiche, B. Zhang, J. Zhang, J. Zhang, L. Zhang, L. M. Zhang, S. Q. Zhang, Z. P. Zhang, H. W. Zhao, H. W. Zhao, M. Zhao, Z. G. Zhao, Y. Zheng, Y. H. Zheng, Z. P. Zheng, V. Zhilich, P. Zhou, R. Y. Zhu, Y. S. Zhu, Z. M. Zhu, V. Zhulanov, T. Ziegler, V. Ziegler, G. Zioulas, M. Zisman, M. Zito, D. Zürcher, N. Zwahlen, O. Zyukova, T. Živko, D. Žontar

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. Read More

In this paper we perform an amplitude analysis of essentially all published pion and kaon pair production data from two photon collisions below 1.5 GeV. This includes all the high statistics results from Belle, as well as older data from Mark II at SLAC, CELLO at DESY, Crystal Ball at SLAC. Read More

Amplitude Analysis of two photon production of $\pi\pi$ and ${\overline K}K$, using S-matrix constraints and fitting all available data, including the latest precision results from Belle, yields a single partial wave solution up to 1.4 GeV. The two photon couplings of the $\sigma/f_0(500)$, $f_0(980)$ and $f_2(1270)$ are determined from the residues of the resonance poles. Read More

We adapt the Veneziano model to the analysis of vector charmonium decays. Starting from a set of covariant Veneziano terms we show how to construct partial waves amplitudes that receive contributions from selected Regge trajectories. The amplitudes, nevertheless retain the proper asymptotic limit. Read More

The contribution that Jefferson Lab has made, with its 6 GeV electron beam, and will make, with its 12 GeV upgrade, to our understanding of the way the fundamental interactions work, particularly strong coupling QCD, is outlined. The physics at the GeV scale is essential even in TeV collisions. Read More

Tremendous progress has been made in mapping out the spectrum of hadrons over the past decade with plans to make further advances in the decade ahead. Baryons and mesons, both expected and unexpected, have been found, the results of precision experiments often with polarized beams, polarized targets and sometimes polarization of the final states. All these hadrons generate poles in the complex energy plane that are consequences of strong coupling QCD. Read More

A brief overview is given of what we know of the baryon and meson spectra, with a focus on what are the key internal degrees of freedom and how these relate to strong coupling QCD. The challenges, experimental, theoretical and phenomenological, for the future are outlined, with particular reference to a program at Jefferson Lab to extract hadronic states in which glue unambiguously contributes to their quantum numbers. Read More

**Authors:**The GlueX Collaboration, A. AlekSejevs, S. Barkanova, M. Dugger, B. Ritchie, I. Senderovich, E. Anassontzis, P. Ioannou, C. Kourkoumeli, G. Voulgaris, N. Jarvis, W. Levine, P. Mattione, W. McGinley, C. A. Meyer, R. Schumacher, M. Staib, P. Collins, F. Klein, D. Sober, D. Doughty, A. Barnes, R. Jones, J. McIntyre, F. Mokaya, B. Pratt, W. Boeglin, L. Guo, P. Khetarpal, E. Pooser, J. Reinhold, H. Al Ghoul, S. Capstick, V. Crede, P. Eugenio, A. Ostrovidov, N. Sparks, A. Tsaris, D. Ireland, K. Livingston, D. Bennett, J. Bennett, J. Frye, M. Lara, J. Leckey, R. Mitchell, K. Moriya, M. R. Shepherd, A. Szczepaniak, R. Miskimen, A. Mushkarenkov, B. Guegan, J. Hardin, J. Stevens, M. Williams, A. Ponosov, S. Somov, C. Salgado, P. Ambrozewicz, A. Gasparian, R. Pedroni, T. Black, L. Gan, S. Dobbs, K. K. Seth, A. Tomaradze, J. Dudek, F. Close, E. Swanson, S. Denisov, G. Huber, D. Kolybaba, S. Krueger, G. Lolos, Z. Papandreou, A. Semenov, I. Semenova, M. Tahani, W. Brooks, H. Hakobyan, S. Kuleshov, O. Soto, A. Toro, I. Vega, R. White, F. Barbosa, E. Chudakov, H. Egiyan, M. Ito, D. Lawrence, M. McCaughan, M. Pennington, L. Pentchev, Y. Qiang, E. S. Smith, A. Somov, S. Taylor, T. Whitlatch, E. Wolin, B. Zihlmann

**Category:**Nuclear Experiment

The primary motivation of the GlueX experiment is to search for and ultimately study the pattern of gluonic excitations in the meson spectrum produced in $\gamma p$ collisions. Recent lattice QCD calculations predict a rich spectrum of hybrid mesons that have both exotic and non-exotic $J^{PC}$, corresponding to $q\bar{q}$ states ($q=u,$ $d,$ or $s$) coupled with a gluonic field. A thorough study of the hybrid spectrum, including the identification of the isovector triplet, with charges 0 and $\pm1$, and both isoscalar members, $|s\bar{s}\ >$ and $|u\bar{u}\ > + |d\bar{d}\ >$, for each predicted hybrid combination of $J^{PC}$, may only be achieved by conducting a systematic amplitude analysis of many different hadronic final states. 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 non-perturbative gluon and ghost propagators in Landau gauge QCD are obtained using the Schwinger-Dyson equation approach. The propagator equations are solved in Euclidean space using Landau gauge with a range of vertex inputs. Initially we solve for the ghost alone, using a model gluon input, which leads us to favour a finite ghost dressing in the non-perturbative region. Read More

The past 40 years have taught us that nucleons are built of constituents that carry colour charges with interactions governed by Quantum Chromodynamics (QCD). How experiments (past, present and future) at Jefferson Lab probe colourless nuclei to map out these internal colour degrees of freedom is presented. When combined with theoretical calculations, these will paint a picture of how the confinement of quarks and gluons, and the structure of the QCD vacuum, determine the properties of all (light) strongly interacting states. Read More

This is the final talk of NSTAR2011 conference. It is not a summary talk, but rather a looking forward to what still needs to be done in excited baryon physics. In particular, we need to hone our tools connecting experimental inputs with QCD. Read More

One-loop unitarized Chiral Perturbation Theory (UChPT) calculations, suggest a different Nc behaviour for the sigma or f0(600) and rho(770) mesons: while the rho meson becomes narrower with Nc, as expected for a qqbar meson, the f0(600) contribution to the total cross section below 1 GeV becomes less and less important. Here we review our recent work where we have shown, by means of finite energy sum rules, that a different Nc behaviour for these resonances may lead to a conflict with semi-local duality for large Nc, since local duality requires a cancellation between the f0(600) and rho(770) amplitudes. However, UChPT calculations also suggest a subdominant qqbar component for the f0(600) with a mass above 1 GeV and this can restore semi-local duality, as we show. Read More

The Gluon and Ghost propagators in Landau gauge QCD are investigated using the Schwinger-Dyson equation approach. Working in Euclidean spacetime, we solve for these propagators using a selection of vertex inputs, initially for the ghost equation alone and then for both propagators simultaneously. The results are shown to be highly sensitive to the choices of vertices. Read More

The Schwinger-Dyson, Bethe-Salpeter system of equations are the link between coloured quarks and gluons, and colourless hadrons and their properties. This talk reviews some aspects of these studies from the infrared behaviour of ghosts to the prediction of electromagnetic form-factors. Read More

The leading $1/N_c$ behaviour of Unitarised Chiral Perturbation Theory distinguishes the nature of the $\rho$ and the $\sigma$. At one loop order the $\rho$ is a ${\bar q}q$ meson, while the $\sigma$ is not. However, semi-local duality between resonances and Regge behaviour cannot be satisfied for larger $N_c$, if such a distinction holds. Read More

**Authors:**G. Amelino-Camelia, F. Archilli, D. Babusci, D. Badoni, G. Bencivenni, J. Bernabeu, R. A. Bertlmann, D. R. Boito, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, A. Budano, S. A. Bulychjev, P. Campana, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwinski, H. Czyz, G. D'Ambrosio, E. Dané, E. De Lucia, G. De Robertis, A. De Santis, P. De Simone, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, D. Domenici, S. I. Eidelman, O. Erriquez, R. Escribano, R. Essig, G. V. Fedotovich, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, F. Giacosa, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher, B. C. Hiesmayr, B. Höistad, E. Iarocci, S. Ivashyn, M. Jacewicz, F. Jegerlehner, T. Johansson, J. Lee-Franzini, W. Kluge, V. V. Kulikov, A. Kupsc, R. Lehnert, F. Loddo, P. Lukin, M. A. Martemianov, M. Martini, M. A. Matsyuk, N. E. Mavromatos, F. Mescia, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, S. Müller, F. Nguyen, E. Passemar, M. Passera, A. Passeri, V. Patera, M. R. Pennington, J. Prades, L. Quintieri, A. Ranieri, M. Reece, P. Santangelo, S. Sarkar, I. Sarra, M. Schioppa, P. C. Schuster, B. Sciascia, A. Sciubba, M. Silarski, C. Taccini, N. Toro, L. Tortora, G. Venanzoni, R. Versaci, L. -T. Wang, W. Wislicki, M. Wolke, J. Zdebik

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

Light scalar mesons abound in hadron processes, like the alligators in the Florida Everglades. Moreover, scalars are intimately tied to the vacuum structure of QCD. They are the product of many decays. Read More

We examine a spatially discrete reaction diffusion model based on the interactions that create a periodic pattern in the Drosophila eye imaginal disc. This model is capable of generating a regular hexagonal pattern of gene expression behind a moving front, as observed in the fly system. In order to better understand the novel switch and template mechanism behind this pattern formation, we present here a detailed study of the model's behavior in one dimension, using a combination of analytic methods and numerical searches of parameter space. Read More

One-loop unitarized Chiral Perturbation Theory (UChPT) calculations, suggest a different Nc behaviour for the sigma or f_0(600) and rho(770) mesons: while the rho meson becomes narrower with Nc, as is expected for a q-qbar meson, the sigma becomes broader, and its contribution to the total cross section is less and less important. On the other hand, local duality requires a cancellation between the sigma and rho amplitudes, but if there is a different Nc behaviour for them, there is a possible contradiction between the Inverse Amplitude Method (IAM) and local duality for large Nc. However, next to next to leading order UChPT calculations suggested a subdominant q-qbar component for the sigma with a mass around 1. Read More

A short overview of studies of strong coupling problems in hadron physics is presented. The Schwinger-Dyson/Bethe-Salpeter approach in the continuum allows the perturbative regime to be connected to the world of strong coupling that controls confinement and chiral dynamics that in turn determines the properties of light hadrons with just one scale, {\it viz.} $\Lambda_{QCD}$, and with the addition of current masses the properties of heavy flavours too. Read More

We briefly describe what a two photon capability with KLOE2 can measure and discuss what this will teach us about the world of light hadrons. Read More

In principle, calculation of a full Green's function in any field theory requires knowledge of the infinite set of multi-point Green's functions, unless one can find some way of truncating the corresponding Schwinger-Dyson equations. For the fermion and boson propagators in QED this requires an {\it ansatz} for the full three point vertex. Here we illustrate how the properties of gauge invariance, gauge covariance and multiplicative renormalizability impose severe constraints on this fermion-boson interaction, allowing a consistent truncation of the propagator equations. Read More

The results of an Amplitude Analysis of the world data on integrated and differential cross-sections on $\gamma\gamma\to\pi\pi$ are presented, following the publication of the Belle charged pion results. Read More

We perform an Amplitude Analysis of the world published data on $\gamma\gamma\to\pi^+\pi^-$ and $\pi^0\pi^0$. These are dominated in statistics by the recently published results from Belle on the charged pion channel. Nevertheless, having only limited angular information, a range of solutions remain possible. Read More

If a hadronic production process is dominated by two body final state interactions, the amplitude $A$ for the production process can be expanded as a sum of the scattering amplitudes $T$ for the relevant two body channels. Van Beveren and Rupp have claimed that the unitarity relation ${\rm {Im}} A= T^\dag A$ can be satisfied if the coefficients in this expansion are complex. We demonstrate that the coefficients have to be real if the scattering amplitudes $T$ satisfy unitarity. Read More

The PDG Tables list more scalar mesons than can fit into one quark model nonet: indeed, even more than can belong to two multiplets. Consequently, some of these must be states beyond the quark model. So which of these is ${\bar q}q$ or ${\bar{qq}}qq$ or multi-meson molecule or largely glue? How experiment can help us distinguish between these possibilities is discussed. Read More

Scalar mesons are a key expression of the infrared regime of QCD. The lightest of these is the $\sigma$. Now that its pole in the complex energy plane has been precisely located, we can ask whether this state is transiently ${\bar q}q$ or ${\bar {qq}} qq$ or a multi-meson molecule or largely glue? The two photon decay of the $\sigma$ can, in principle, discriminate between these possibilities. Read More

Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we performed a Dalitz plot analysis of the Cabibbo favored decay D+ to K-pi+ pi+. This study uses 53653 Dalitz-plot events with a signal fraction of ~ 97%, and represents the highest statistics, most complete Dalitz plot analysis for this channel. Results are presented and discussed using two different formalisms. Read More