T. Tanabe - The University of Tokyo, Tokyo, Japan

T. Tanabe
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Name
T. Tanabe
Affiliation
The University of Tokyo, Tokyo, Japan
City
Bunkyō-ku
Country
Japan

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Pub Categories

 
High Energy Physics - Experiment (20)
 
High Energy Physics - Phenomenology (17)
 
Physics - Optics (13)
 
Physics - Atomic Physics (5)
 
Solar and Stellar Astrophysics (4)
 
Physics - Instrumentation and Detectors (3)
 
Astrophysics of Galaxies (3)
 
Instrumentation and Methods for Astrophysics (3)
 
Cosmology and Nongalactic Astrophysics (2)
 
Physics - Accelerator Physics (2)
 
Physics - Data Analysis; Statistics and Probability (1)
 
Physics - Soft Condensed Matter (1)
 
High Energy Astrophysical Phenomena (1)

Publications Authored By T. Tanabe

This paper addresses the question of whether the International Linear Collider has the capability of discovering new particles that have not already been discovered at the CERN Large Hadron Collider. We summarize the various paths to discovery offered by the ILC, and discuss them in the context of three different scenarios: 1. LHC does not discover any new particles, 2. Read More

Weakly Interacting Massive Particles (WIMPs, $\chi$) are candidates for Dark Matter. WIMP searches at lepton colliders are complementary to searches at hadron colliders and direct and indirect detection, since they directly probe the coupling to electrons which a priori is independent of the coupling to hadrons. Like at hadron colliders, WIMP pair production can be observed via an additional tag particle, in particular a photon from initial state radiation ($e^+e^-\rightarrow\chi\chi\gamma$). Read More

A core prediction of natural Supersymmetry is the existence of four light higgsinos not too far above the mass of the $Z$ boson. The small mass splittings amongst the higgsinos -- typically 5-20\,GeV -- imply very little visible energy release from decays of heavier higgsinos. In particular, if other SUSY particles are quite heavy, as can be the case in SUSY with radiatively-driven naturalness, the higgsinos are extremely hard to detect at hadron colliders. Read More

2016Jul
Affiliations: 1LCC Physics Working Group, 2LCC Physics Working Group, 3LCC Physics Working Group, 4LCC Physics Working Group, 5LCC Physics Working Group, 6LCC Physics Working Group, 7LCC Physics Working Group, 8LCC Physics Working Group, 9LCC Physics Working Group, 10LCC Physics Working Group, 11LCC Physics Working Group, 12LCC Physics Working Group, 13LCC Physics Working Group, 14LCC Physics Working Group, 15LCC Physics Working Group, 16LCC Physics Working Group, 17LCC Physics Working Group, 18LCC Physics Working Group, 19LCC Physics Working Group, 20LCC Physics Working Group, 21LCC Physics Working Group, 22LCC Physics Working Group, 23LCC Physics Working Group, 24LCC Physics Working Group, 25LCC Physics Working Group

If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out to be a real effect, what are the implications for the physics case and upgrade path of the International Linear Collider? Whether or not the resonance is confirmed, this question provides an interesting case study testing the robustness of the ILC physics case. In this note, we address this question with two points: (1) Almost all models proposed for the new 750 GeV particle require additional new particles with electroweak couplings. The key elements of the 500 GeV ILC physics program---precision measurements of the Higgs boson, the top quark, and 4-fermion interactions---will powerfully discriminate among these models. Read More

We demonstrate a compact and robust method for generating a 399-nm light resonant on the $^{1}S_{0}-^{1}P_{1}$ transition in ytterbium using a single-pass periodically poled LiNbO$_{3}$ waveguide for second harmonic generation (SHG). The obtained output power at 399 nm was 25 mW when a 798-nm fundamental power of 380 mW was coupled to the waveguide. We observed no degradation of the SHG power for 13 hours with a low power of 6 mW. Read More

We report absolute frequency measurements of 81 hyperfine components of the rovibrational transitions of molecular iodine at 578 nm using the second harmonic generation of an 1156-nm external-cavity diode laser and a fiber-based optical frequency comb. The relative uncertainties of the measured absolute frequencies are typically $1.4\times10^{-11}$. Read More

Using the discrete element method (DEM), we study the splash processes induced by the impact of a grain on two types of granular beds, namely, randomly packed and FCC-structured beds.Good correspondence is obtained between our numerical results and the findings of previous experiments, and it is demonstrated that the packing structure of the granular bed strongly affects the splash process.The mean ejection angle for the randomly packed bed is consistent with previous experimental results. Read More

We performed an absolute frequency measurement of the $^1S_{0}$-$^3P_{0}$ transition in $^{87}$Sr with a fractional uncertainty of $1.2 \times 10^{-15}$, which is less than one third that of our previous measurement. A caesium fountain atomic clock was used as a transfer oscillator to reduce the uncertainty of the link between a strontium optical lattice clock and the SI second. Read More

We evaluate the measurement precision of the production cross section times the branching ratio of the Higgs boson decaying into tau lepton pairs at the International Linear Collider (ILC). We analyze various final states associated with the main production mechanisms of the Higgs boson, the Higgs-strahlung and WW-fusion processes. The statistical precision of the production cross section times the branching ratio is estimated to be 2. Read More

We propose a new beam dump experiment at future colliders with electron ($e^-$) and positron ($e^+$) beams, BDee, which will provide a new possibility to search for hidden particles, like hidden photon. If a particle detector is installed behind the beam dump, it can detect the signal of in-flight decay of the hidden particles produced by the scatterings of $e^\pm$ beams off materials for dumping. We show that, compared to past experiments, BDee (in particular BDee at $e^+e^-$ linear collider) significantly enlarges the parameter region where the signal of the hidden particle can be discovered. Read More

We report on the progress in flavor identification tools developed for a future $e^+e^-$ linear collider such as the International Linear Collider (ILC) and Compact Linear Collider (CLIC). Building on the work carried out by the LCFIVertex collaboration, we employ new strategies in vertex finding and jet finding, and introduce new discriminating variables for jet flavor identification. We present the performance of the new algorithms in the conditions simulated using a detector concept designed for the ILC. Read More

We demonstrate a compact iodine-stabilized laser operating at 531 nm using a coin-sized light source consisting of a 1062-nm distributed-feedback diode laser and a frequency-doubling element. A hyperfine transition of molecular iodine is observed using the light source with saturated absorption spectroscopy. The light source is frequency stabilized to the observed iodine transition and achieves frequency stability at the 10$^{-12}$ level. Read More

We summarize the physics case for the International Linear Collider (ILC). We review the key motivations for the ILC presented in the literature, updating the projected measurement uncertainties for the ILC experiments in accord with the expected schedule of operation of the accelerator and the results of the most recent simulation studies. Read More

We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau pairs at the ILC with a full simulation of the ILD detector concept. We assume a Higgs mass of 125 GeV, a branching ratio of BR($h \to \tau ^+ \tau ^-$) = 6.32%, a beam polarization of electron (positron) of -0. Read More

The origin of Galactic cosmic rays remains unconfirmed, but promising candidates for their sources are found in star-forming regions. We report a series of X-ray observations, with Suzaku, toward the nearby star-forming region of Cygnus X. They aim at comparing diffuse X-ray emissions on and off the $\gamma$-ray cocoon of hard cosmic rays revealed by Fermi LAT. Read More

Luminous infrared galaxies (LIRGs) are enshrouded by a large amount of dust, produced by their active star formation, and it is difficult to measure their activity in the optical wavelength. We have carried out Pa$\alpha$ narrow-band imaging observations of 38 nearby star-forming galaxies including 33 LIRGs listed in $IRAS$ RBGS catalog with the Atacama Near InfraRed camera (ANIR) on the University of Tokyo Atacama Observatory (TAO) 1.0 m telescope (miniTAO). Read More

2014Oct
Affiliations: 1Dip. di Fisica, UTOV, Rome, Italy, 2Kiso Observatory, The University of Tokyo, Japan, 3ESO, Germany, 4Dip. di Fisica, UTOV, Rome, Italy, 5Carnegie, Pasadena, USA, 6INAF-OAR, Rome, Italy, 7INAF-OAR, Rome, Italy, 8Carnegie, Pasadena, USA, 9Dip. di Fisica, UTOV, Rome, Italy, 10Carnegie, Pasadena, USA, 11Univ. de Concepcioon, Concepcion, Chile, 12Koninklijke Sterrenwacht van Belgiee, Brussel, Belgium, 13, Tohoku University, Japan, 14SAAO, South Africa, 15Anton Pannekoek, Science Park, Amsterdam, The Netherlands, 16Carnegie, Pasadena, USA, 17Nagoya University, Nagoya, Japan, 18The University of Tokyo, Tokyo, Japan, 19INAF-OAT, Trieste, Italy, 20Univ. de Concepcioon, Concepcion, Chile, 21ESO, Germany, 22Carnegie, Pasadena, USA, 23Warsaw University Observatory, Warszawa, Poland, 24The University of Tokyo, Tokyo, Japan, 25Warsaw University Observatory, Warszawa, Poland

We present new near-infrared (NIR) light-curve templates for fundamental (FU, JHK) and first overtone (FO, J) Cepheids. The new templates together with PL and PW relations provide Cepheid distances from single-epoch observations with a precision only limited by the intrinsic accuracy of the method adopted. The templates rely on a very large set of Galactic and Magellanic Clouds (MCs) Cepheids (FU,~600; FO,~200) with well sampled NIR (IRSF data) and optical (V,I; OGLE data) light curves. Read More

We present a study of the expected precision for measurement of the top Yukawa coupling, yt, in e+e- collisions at a center-of-mass energy of 1 TeV and assuming a beam polarization of P (e-, e+) = (-0.8,+0.2). Read More

A numerical and experimental study of the generation of harmonic mode locking in a silica toroid microcavity is presented. We use a generalized mean-field Lugiato-Lefever equation and solve it with the split-step Fourier method. We found that stable harmonic mode locking regime can be accessed when we reduce the input power after strong pumping even when we do not carefully adjust the wavelength detuning. Read More

We demonstrate experimentally an all-optical switching operation using the Kerr effect in a silica toroid microcavity. Thanks to the small mode volume and high quality factor of the silica toroid microcavity, we achieved on-chip optical Kerr switching with an input power of 2 mW. This value is the smallest among all previously reported on-chip optical Kerr switches. Read More

2014Jun
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. Coupal, R. Covarelli, G. Cowan, W. W. Craddock, G. Crane, H. B. Crawley, L. Cremaldi, A. Crescente, M. Cristinziani, J. Crnkovic, G. Crosetti, T. Cuhadar-Donszelmann, A. Cunha, S. Curry, A. D'Orazio, S. Dû, G. Dahlinger, B. Dahmes, C. Dallapiccola, N. Danielson, M. Danilov, A. Das, M. Dash, S. Dasu, M. Datta, F. Daudo, P. D. Dauncey, P. David, C. L. Davis, C. T. Day, F. De Mori, G. De Domenico, N. De Groot, C. De la Vaissière, Ch. de la Vaissière, A. de Lesquen, G. De Nardo, R. de Sangro, A. De Silva, S. DeBarger, F. J. Decker, P. del Amo Sanchez, L. Del Buono, V. Del Gamba, D. del Re, G. Della Ricca, A. G. Denig, D. Derkach, I. M. Derrington, H. DeStaebler, J. Destree, S. Devmal, B. Dey, B. Di Girolamo, E. Di Marco, M. Dickopp, M. O. Dima, S. Dittrich, S. Dittongo, P. Dixon, L. Dneprovsky, F. Dohou, Y. Doi, Z. Doležal, D. A. Doll, M. Donald, L. Dong, L. Y. Dong, J. Dorfan, A. Dorigo, M. P. Dorsten, R. Dowd, J. Dowdell, Z. Drásal, J. Dragic, B. W. Drummond, R. S. Dubitzky, G. P. Dubois-Felsmann, M. S. Dubrovin, Y. C. Duh, Y. T. Duh, D. Dujmic, W. Dungel, W. Dunwoodie, D. Dutta, A. Dvoretskii, N. Dyce, M. Ebert, E. A. Eckhart, S. Ecklund, R. Eckmann, P. Eckstein, C. L. Edgar, A. J. Edwards, U. Egede, A. M. Eichenbaum, P. Elmer, S. Emery, Y. Enari, R. Enomoto, E. Erdos, R. Erickson, J. A. Ernst, R. J. Erwin, M. Escalier, V. Eschenburg, I. Eschrich, S. Esen, L. Esteve, F. Evangelisti, C. W. Everton, V. Eyges, C. Fabby, F. Fabozzi, S. Fahey, M. Falbo, S. Fan, F. Fang, F. Fang, C. Fanin, A. Farbin, H. Farhat, J. E. Fast, M. Feindt, A. Fella, E. Feltresi, T. Ferber, R. E. Fernholz, S. Ferrag, F. Ferrarotto, F. Ferroni, R. C. Field, A. Filippi, G. Finocchiaro, E. Fioravanti, J. Firmino da Costa, P. -A. Fischer, A. Fisher, P. H. Fisher, C. J. Flacco, R. L. Flack, H. U. Flaecher, J. Flanagan, J. M. Flanigan, K. E. Ford, W. T. Ford, I. J. Forster, A. C. Forti, F. Forti, D. Fortin, B. Foster, S. D. Foulkes, G. Fouque, J. Fox, P. Franchini, M. Franco Sevilla, B. Franek, E. D. Frank, K. B. Fransham, S. Fratina, K. Fratini, A. Frey, R. Frey, M. Friedl, M. Fritsch, J. R. Fry, H. Fujii, M. Fujikawa, Y. Fujita, Y. Fujiyama, C. Fukunaga, M. Fukushima, J. Fullwood, Y. Funahashi, Y. Funakoshi, F. Furano, M. Furman, K. Furukawa, H. Futterschneider, E. Gabathuler, T. A. Gabriel, N. Gabyshev, F. Gaede, N. Gagliardi, A. Gaidot, J. -M. Gaillard, J. R. Gaillard, S. Galagedera, F. Galeazzi, F. Gallo, D. Gamba, R. Gamet, K. K. Gan, P. Gandini, S. Ganguly, S. F. Ganzhur, Y. Y. Gao, I. Gaponenko, A. Garmash, J. Garra Tico, I. Garzia, M. Gaspero, F. Gastaldi, C. Gatto, V. Gaur, N. I. Geddes, T. L. Geld, J. -F. Genat, K. A. George, M. George, S. George, Z. Georgette, T. J. Gershon, M. S. Gill, R. Gillard, J. D. Gilman, F. Giordano, M. A. Giorgi, P. -F. Giraud, L. Gladney, T. Glanzman, R. Glattauer, A. Go, K. Goetzen, Y. M. Goh, G. Gokhroo, P. Goldenzweig, V. B. Golubev, G. P. Gopal, A. Gordon, A. Gorišek, V. I. Goriletsky, R. Gorodeisky, L. Gosset, K. Gotow, S. J. Gowdy, P. Graffin, S. Grancagnolo, E. Grauges, G. Graziani, M. G. Green, M. G. Greene, G. J. Grenier, P. Grenier, K. Griessinger, A. A. Grillo, B. V. Grinyov, A. V. Gritsan, G. Grosdidier, M. Grosse Perdekamp, P. Grosso, M. Grothe, Y. Groysman, O. Grünberg, E. Guido, H. Guler, N. J. W. Gunawardane, Q. H. Guo, R. S. Guo, Z. J. Guo, N. Guttman, H. Ha, H. C. Ha, T. Haas, J. Haba, J. Hachtel, H. K. Hadavand, T. Hadig, C. Hagner, M. Haire, F. Haitani, T. Haji, G. Haller, V. Halyo, K. Hamano, H. Hamasaki, G. Hamel de Monchenault, J. Hamilton, R. Hamilton, O. Hamon, B. Y. Han, Y. L. Han, H. Hanada, K. Hanagaki, F. Handa, J. E. Hanson, A. Hanushevsky, K. Hara, T. Hara, Y. Harada, P. F. Harrison, T. J. Harrison, B. Harrop, A. J. Hart, P. A. Hart, B. L. Hartfiel, J. L. Harton, T. Haruyama, A. Hasan, Y. Hasegawa, C. Hast, N. C. Hastings, K. Hasuko, A. Hauke, C. M. Hawkes, K. Hayashi, M. Hazumi, C. Hee, E. M. Heenan, D. Heffernan, T. Held, R. Henderson, S. W. Henderson, S. S. Hertzbach, S. Hervé, M. Heß, C. A. Heusch, A. Hicheur, Y. Higashi, Y. Higasino, I. Higuchi, S. Hikita, E. J. Hill, T. Himel, L. Hinz, T. Hirai, H. Hirano, J. F. Hirschauer, D. G. Hitlin, N. Hitomi, M. C. Hodgkinson, A. Höcker, C. T. Hoi, T. Hojo, T. Hokuue, J. J. Hollar, T. M. Hong, K. Honscheid, B. Hooberman, D. A. Hopkins, Y. Horii, Y. Hoshi, K. Hoshina, S. Hou, W. S. Hou, T. Hryn'ova, Y. B. Hsiung, C. L. Hsu, S. C. Hsu, H. Hu, T. Hu, H. C. Huang, T. J. Huang, Y. C. Huang, Z. Huard, M. E. Huffer, D. Hufnagel, T. Hung, D. E. Hutchcroft, H. J. Hyun, S. Ichizawa, T. Igaki, A. Igarashi, S. Igarashi, Y. Igarashi, O. Igonkina, K. Ikado, H. Ikeda, H. Ikeda, K. Ikeda, J. Ilic, K. Inami, W. R. Innes, Y. Inoue, A. Ishikawa, A. Ishikawa, H. Ishino, K. Itagaki, S. Itami, K. Itoh, V. N. Ivanchenko, R. Iverson, M. Iwabuchi, G. Iwai, M. Iwai, S. Iwaida, M. Iwamoto, H. Iwasaki, M. Iwasaki, M. Iwasaki, T. Iwashita, J. M. Izen, D. J. Jackson, F. Jackson, G. Jackson, P. S. Jackson, R. G. Jacobsen, C. Jacoby, I. 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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

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We design a silica zipper cavity that has high optical and mechanical Q (quality factor) values and demonstrate numerically the feasibility of a radiation pressure driven micro opto-mechanical system (MOMS) directional switch. The silica zipper cavity has an optical Q of 6.0x10^4 and an effective mode volume Vmode of 0. Read More

We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau lepton pairs $h \to \tau ^+ \tau ^-$ at the ILC with a center-of-mass energy of $\sqrt{s} = 500$ GeV with a full simulation of the ILD detector. We assume a Higgs mass of $M_h = 125$ GeV, a branching ratio of $\mathrm{BR}(h \to \tau ^+ \tau ^-) = 6.32 \%$, beam polarizations of $P(e^+, e^-) = (-0. Read More

The frequency ratio of the 1S0(F=1/2)-3P0(F=1/2) clock transition in 171Yb and the 1S0(F=9/2)-3P0(F=9/2) clock transition in 87Sr is measured by an optical-optical direct frequency link between two optical lattice clocks. We determined the ratio (\nu_{Yb}/\nu_{Sr}) to be 1.207 507 039 343 340 4(18) with a fractional uncertainty of 1. 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

The ILC Higgs White Paper is a review of Higgs Boson theory and experiment at the International Linear Collider (ILC). Theory topics include the Standard Model Higgs, the two-Higgs doublet model, alternative approaches to electroweak symmetry breaking, and precision goals for Higgs boson experiments. Experimental topics include the measurement of the Higgs cross section times branching ratio for various Higgs decay modes at ILC center of mass energies of 250, 500, and 1000 GeV, and the extraction of Higgs couplings and the total Higgs width from these measurements. Read More

2013Sep
Affiliations: 1DESY, 2University of Pittsburgh, 3DESY, 4University of California, San Diego, 5University of Arizona, 6University of Tokyo

We make a systematic and comparative study for the LHC and ILC for the electroweakino searches in the Minimal Supersymmetric Standard Model. We adopt a general bottom-up approach and scan over the parameter regions for all the three cases of the lightest supersymmetric particle being Bino-, Wino-, and Higgsino-like. The electroweakino signal from pair production and subsequent decay to Wh (h to b\bar b) final state may yield a sensitivity of 95% C. Read More

We numerically studied the required conditions for achieving a memory operation based on Kerr bistability in the presence of the thermo-optic effect in silicon nitride microring cavity systems. By comparing a side-coupled system and an add-drop system, we found that the latter is needed to realize obtain Kerr bistable operation. In addition, we show the coupling coefficient range in which the memory operation does not suffer from the thermo-optic effect. Read More

We evaluate the measurement accuracy of the branching ratio of $h \to \tau ^+ \tau ^-$ at $\sqrt{s} = 250$ GeV and 500 GeV at the ILC with the ILD detector simulation. For the $\sqrt{s} = 250$ GeV, we assume the Higgs mass of $M_h = 120$ GeV, branching ratio of $\mathrm{Br}(h \to \tau ^+ \tau ^-) = 8.0 \ %$, beam polarization of $P(e^-, e^+) = (-0. Read More

The International Linear Collider (ILC) has recently proven its technical maturity with the publication of a Technical Design Report, and there is a strong interest in Japan to host such a machine. We summarize key aspects of the Beyond the Standard Model physics case for the ILC in this contribution to the US High Energy Physics strategy process. On top of the strong guaranteed physics case in the detailed exploration of the recently discovered Higgs boson, the top quark and electroweak precision measurements, the ILC will offer unique opportunities which are complementary to the LHC program of the next decade. Read More

2013Jul
Authors: Halina Abramowicz, Angel Abusleme, Konstatin Afanaciev, Gideon Alexander, Niloufar Alipour Tehrani, Oscar Alonso, Kristoffer K. Andersen, Samir Arfaoui, Csaba Balazs, Tim Barklow, Marco Battaglia, Mathieu Benoit, Burak Bilki, Jean-Jacques Blaising, Mark Boland, Marça Boronat, Ivanka Božović Jelisavčić, Philip Burrows, Maximilien Chefdeville, Roberto Contino, Dominik Dannheim, Marcel Demarteau, Marco Aurelio Diaz Gutierrez, Angel Diéguez, Jorge Duarte Campderros, Gerald Eigen, Konrad Elsener, Dan Feldman, Uli Felzmann, Mirosław Firlej, Elena Firu, Tomasz Fiutowski, Kurt Francis, Frank Gaede, Ignacio García García, Veta Ghenescu, Gian Giudice, Norman Graf, Christian Grefe, Christophe Grojean, Rick S. Gupta, Michael Hauschild, Helga Holmestad, Marek Idzik, Christian Joram, Sergey Kananov, Yannis Karyotakis, Martin Killenberg, Wolfgang Klempt, Sabine Kraml, Beata Krupa, Szymon Kulis, Tomáš Laštovička, Greg LeBlanc, Aharon Levy, Itamar Levy, Lucie Linssen, Angela Lucaci Timoce, Strahinja Lukić, Vladimir Makarenko, John Marshall, Victoria Martin, Rune E. Mikkelsen, Gordana Milutinović-Dumbelović, Akiya Miyamoto, Klaus Mönig, Gudrid Moortgat-Pick, Jakub Moroń, Astrid Münnich, Alina Neagu, Mila Pandurović, Duccio Pappadopulo, Bogdan Pawlik, Werner Porod, Stéphane Poss, Titi Preda, Roger Rassool, Ricardo Rattazzi, Sophie Redford, Jose Repond, Sabine Riemann, Aidan Robson, Philipp Roloff, Eduardo Ros, Jonatan Rosten, Alberto Ruiz-Jimeno, Heidi Rzehak, André Sailer, Dieter Schlatter, Daniel Schulte, Felix Sefkow, Katja Seidel, Nikolai Shumeiko, Eva Sicking, Frank Simon, Jacob Smith, Christian Soldner, Steinar Stapnes, Jan Strube, Taikan Suehara, Krzysztof Świentek, Marco Szalay, Tomohiko Tanabe, Michal Tesař, Andrea Thamm, Mark Thomson, Juan Trenado Garcia, Ulrik I. Uggerhøj, Erik van der Kraaij, Iván Vila, Eva Vilella, Miguel Angel Villarejo, Marcelo Alonso Vogel Gonzalez, Marcel Vos, Nigel Watson, Harry Weerts, James D. Wells, Lars Weuste, Tobias N. Wistisen, Kent Wootton, Lei Xia, Leszek Zawiejski, Ion-Sorin Zgura

This paper summarizes the physics potential of the CLIC high-energy e+e- linear collider. It provides input to the Snowmass 2013 process for the energy-frontier working groups on The Higgs Boson (HE1), Precision Study of Electroweak Interactions (HE2), Fully Understanding the Top Quark (HE3), as well as The Path Beyond the Standard Model -- New Particles, Forces, and Dimensions (HE4). It is accompanied by a paper describing the CLIC accelerator study, submitted to the Frontier Capabilities group of the Snowmass process. Read More

We investigated the whispering gallery modes of cavities with a hexagonal cross-section. We found two different modes, namely perturbed and quasi-WGMs, of which the former exhibits the higher Q when the corner radius is large. We studied the dependence of Q on the curvature radius of the polygonal cavities and found that the coupling between the two modes determines the Q of the cavity. Read More

We developed a new method for fabricating crystalline whispering gallery mode cavities based on laser-heated pedestal growth. We fabricated sapphire cavities and obtained a Q factor of 16000 with a cavity whose diameter was about 240 um. We showed numerically that the cross-sectional shape of the cavity is sensitive to the cavity Q, and we controlled it successfully by changing the growth condition in the molten zone, without significantly degrading the crystal structure. Read More

We present a near- to mid-infrared point source catalog of 5 photometric bands at 3.2, 7, 11, 15 and 24 um for a 10 deg2 area of the Large Magellanic Cloud (LMC) obtained with the Infrared Camera (IRC) onboard the AKARI satellite. To cover the survey area the observations were carried out at 3 separate seasons from 2006 May to June, 2006 October to December, and 2007 March to July. Read More

We model the nonlinear response of a silica toroid microcavity using coupled mode theory and a finite element method, and successfully obtain Kerr bistable operation that does not suffer from thermo-optic effect by optimizing the fiber-cavity coupling. Our analysis shows it is possible to demonstrate a Kerr bistable memory with a memory holding time of 500 ns at an extremely low energy consumption. Read More

In order to test a recent hypothesis that the dispersion in the Schmidt-Kennicutt law arises from variations in the evolutionary stage of star forming molecular clouds, we compared molecular gas and recent star formation in an early-phase merger galaxy pair, Taffy I (UGC\ 12915/UGC\ 12914, VV\ 254) which went through a direct collision 20 Myr ago and whose star forming regions are expected to have similar ages. Narrow-band Pa-alpha image is obtained using the ANIR near-infrared camera on the mini-TAO 1m telescope. The image enables us to derive accurate star formation rates within the galaxy directly. Read More

We fabricated polygonal silica toroidal microcavities to achieve stable mechanical coupling with an evanescent coupler such as a tapered fiber. The polygonal cavity was fabricated by using a combination of isotropic etching, anisotropic etching and laser reflow. It offers both high and low coupling efficiencies with the cavity mode even when the coupler is in contact with the cavity, which offers the possibility of taking the device outside the laboratory. Read More

In collider physics at the TeV scale, there are many important processes which involve six or more jets. The sensitivity of the physics analysis depends critically on the performance of the jet clustering algorithm. We present a full detector simulation study for the ILC of our new algorithm which makes use of secondary vertices which improves the reconstruction of b jets. Read More

Mid-infrared images frequently suffer artifacts and extended point spread functions (PSFs). We investigate the characteristics of the artifacts and the PSFs in images obtained with the Infrared Camera (IRC) onboard AKARI at four mid-infrared bands of the S7 (7{\mu}m), S11 (11{\mu}m), L15 (15{\mu}m), and L24 (24 {\mu}m). Removal of the artifacts significantly improves the reliability of the ref- erence data for flat-fielding at the L15 and L24 bands. Read More

We report on the feasibility of the direct measurement of the top Yukawa coupling g_t at the International Linear Collider (ILC) during its first phase of operation with a center-of-mass energy of 500 GeV. The signal and background models incorporate the non-relativistic QCD corrections which enhance the production cross section near the t-tbar threshold. The e+e- -> t tbar H signal is reconstructed in the 6-jet + lepton and the 8-jet modes. Read More

We demonstrate adiabatic wavelength shifting by electro-optic modulation using a p-i-n integrated high-Q photonic crystal nanocavity. The wavelength of the trapped light is adiabatically shifted by modulating the resonance of the cavity faster than the photon lifetime. The cavity resonance is changed by injecting electrons through a p-i-n junction to reduce the refractive index. Read More

2010Aug
Affiliations: 1Institute of Space and Astronautical Science, JAXA, 2Institute of Astronomy, School of Science, The University of Tokyo, 3Institute of Astronomy, School of Science, The University of Tokyo

Near-infrared medium-resolution spectra of seven bright brown dwarfs are presented. The spectra were obtained with the Infrared Camera (IRC) on board the infrared astronomical satellite AKARI, covering 2.5--5. Read More

The ILC physics working group is a mixture of experimentalists and theorists mainly working in Japan. It has its origin in the previous LC physics study group and has been reformed with the initiative of a JSPS Creative Scientific Research project: "Research and Development of a Novel Detector System for the International Linear Collider". The working group is, however, formally independent of the JSPS project and is open to everybody who is interested in ILC physics. Read More

We consider analysis targets at the International Linear Collider in which only a single photon can be observed. For such processes, we have developed a method which uses likelihood distributions using the full event information (photon energy and angle). The method was applied to a search for neutralino pair production with a photon from initial state radiation (ISR) in the case of supergravity in which the neutralino is the lightest supersymmetric particle. Read More

2010Mar
Affiliations: 1NAOJ, 2UCL, Department of Physics and Astronomy, 3Nagoya University, 4ISAS/JAXA, 5ISAS/JAXA, 6ISAS/JAXA, 7ISAS/JAXA, 8IOA, The University of Tokyo, 9IOA, The University of Tokyo, 10IOA, The University of Tokyo, 11Department of Astronomy, The University of Tokyo, 12ISAS/JAXA, 13Department of Astronomy, The University of Tokyo, 14ISAS/JAXA

Results: We found that the (B-V) v.s. (V-S9W) color-color diagram is useful to identify the stars with infrared excess emerged from circumstellar envelopes/disks. Read More

2010Mar
Affiliations: 1NAOJ, 2UCL, Department of Physics and Astronomy, 3Nagoya University, 4ISAS/JAXA, 5ISAS/JAXA, 6ISAS/JAXA, 7ISAS/JAXA, 8IOA, The University of Tokyo, 9IOA, The University of Tokyo, 10IOA, The University of Tokyo, 11Department of Astronomy, The University of Tokyo, 12ISAS/JAXA, 13Department of Astronomy, The University of Tokyo, 14ISAS/JAXA

--Results-- We found that the (B-V) v.s. (V-S9W) color-color diagram is useful to identify the stars with infrared excess emerged from circumstellar envelopes/disks. Read More

2010Mar
Affiliations: 1Nagoya University, 2Department of Astronomy, Univ. of Tokyo, 3ISAS/JAXA, 4ESAC, Madrid, 5ESAC, Madrid, 6ESAC, Madrid, 7ESAC, Madrid, 8ESAC, Madrid, 9ESAC, Madrid, 10Univ. of California, Berkeley, 11ISAS/JAXA, 12Department of Astronomy, Univ. of Tokyo, 13ISAS/JAXA, 14NAO, 15ISAS/JAXA, 16ISAS/JAXA, 17ISAS/JAXA, 18Max-Planck-Institut, 19ISAS/JAXA, 20ASIAA, Taipei, 21ISAS/JAXA, 22KASI, Daejeon, 23Department of Astronomy, Univ. of Tokyo, 24Osaka University, 25ISAS/JAXA, 26IOA, Univ. of Tokyo, 27ISAS/JAXA, 28ISAS/JAXA, 29ISAS/JAXA, 30ISAS/JAXA, 31JAXA Tsukuba, 32ISAS/JAXA, 33ISAS/JAXA

Context : AKARI is the first Japanese astronomical satellite dedicated to infrar ed astronomy. One of the main purposes of AKARI is the all-sky survey performed with six infrared bands between 9 and 200um during the period from 2006 May 6 to 2007 August 28. In this paper, we present the mid-infrared part (9um and 18um b ands) of the survey carried out with one of the on-board instruments, the Infrar ed Camera (IRC). Read More

We demonstrate channel selective 0.1-Gb/s photo-receiver operation at telecom wavelength using a silicon high-Q photonic crystal nanocavity with a laterally integrated p-i-n diode. Due to the good crystal property of silicon the measured dark current is only 15 pA. Read More