Y. Takubo - High Energy Accelerator Research Organization, Tsukuba, Japan

Y. Takubo
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Name
Y. Takubo
Affiliation
High Energy Accelerator Research Organization, Tsukuba, Japan
City
Tsukuba
Country
Japan

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Pub Categories

 
High Energy Physics - Phenomenology (18)
 
Physics - Instrumentation and Detectors (14)
 
High Energy Physics - Experiment (11)
 
Physics - Accelerator Physics (4)
 
Cosmology and Nongalactic Astrophysics (1)

Publications Authored By Y. Takubo

2016Aug
Authors: The CLIC, CLICdp collaborations, :, M. J. Boland, U. Felzmann, P. J. Giansiracusa, T. G. Lucas, R. P. Rassool, C. Balazs, T. K. Charles, K. Afanaciev, I. Emeliantchik, A. Ignatenko, V. Makarenko, N. Shumeiko, A. Patapenka, I. Zhuk, A. C. Abusleme Hoffman, M. A. Diaz Gutierrez, M. Vogel Gonzalez, Y. Chi, X. He, G. Pei, S. Pei, G. Shu, X. Wang, J. Zhang, F. Zhao, Z. Zhou, H. Chen, Y. Gao, W. Huang, Y. P. Kuang, B. Li, Y. Li, J. Shao, J. Shi, C. Tang, X. Wu, L. Ma, Y. Han, W. Fang, Q. Gu, D. Huang, X. Huang, J. Tan, Z. Wang, Z. Zhao, T. Laštovička, U. Uggerhoj, T. N. Wistisen, A. Aabloo, K. Eimre, K. Kuppart, S. Vigonski, V. Zadin, M. Aicheler, E. Baibuz, E. Brücken, F. Djurabekova, P. Eerola, F. Garcia, E. Haeggström, K. Huitu, V. Jansson, V. Karimaki, I. Kassamakov, A. Kyritsakis, S. Lehti, A. Meriläinen, R. Montonen, T. Niinikoski, K. Nordlund, K. Österberg, M. Parekh, N. A. Törnqvist, J. Väinölä, M. Veske, W. Farabolini, A. Mollard, O. Napoly, F. Peauger, J. Plouin, P. Bambade, I. Chaikovska, R. Chehab, M. Davier, W. Kaabi, E. Kou, F. LeDiberder, R. Pöschl, D. Zerwas, B. Aimard, G. Balik, J. -P. Baud, J. -J. Blaising, L. Brunetti, M. Chefdeville, C. Drancourt, N. Geoffroy, J. Jacquemier, A. Jeremie, Y. Karyotakis, J. M. Nappa, S. Vilalte, G. Vouters, A. Bernard, I. Peric, M. Gabriel, F. Simon, M. Szalay, N. van der Kolk, T. Alexopoulos, E. N. Gazis, N. Gazis, E. Ikarios, V. Kostopoulos, S. Kourkoulis, P. D. Gupta, P. Shrivastava, H. Arfaei, M. K. Dayyani, H. Ghasem, S. S. Hajari, H. Shaker, Y. Ashkenazy, H. Abramowicz, Y. Benhammou, O. Borysov, S. Kananov, A. Levy, I. Levy, O. Rosenblat, G. D'Auria, S. Di Mitri, T. Abe, A. Aryshev, T. Higo, Y. Makida, S. Matsumoto, T. Shidara, T. Takatomi, Y. Takubo, T. Tauchi, N. Toge, K. Ueno, J. Urakawa, A. Yamamoto, M. Yamanaka, R. Raboanary, R. Hart, H. van der Graaf, G. Eigen, J. Zalieckas, E. Adli, R. Lillestøl, L. Malina, J. Pfingstner, K. N. Sjobak, W. Ahmed, M. I. Asghar, H. Hoorani, S. Bugiel, R. Dasgupta, M. Firlej, T. A. Fiutowski, M. Idzik, M. Kopec, M. Kuczynska, J. Moron, K. P. Swientek, W. Daniluk, B. Krupa, M. Kucharczyk, T. Lesiak, A. Moszczynski, B. Pawlik, P. Sopicki, T. Wojtoń, L. Zawiejski, J. Kalinowski, M. Krawczyk, A. F. Żarnecki, E. Firu, V. Ghenescu, A. T. Neagu, T. Preda, I-S. Zgura, A. Aloev, N. Azaryan, J. Budagov, M. Chizhov, M. Filippova, V. Glagolev, A. Gongadze, S. Grigoryan, D. Gudkov, V. Karjavine, M. Lyablin, A. Olyunin, A. Samochkine, A. Sapronov, G. Shirkov, V. Soldatov, A. Solodko, E. Solodko, G. Trubnikov, I. Tyapkin, V. Uzhinsky, A. Vorozhtov, E. Levichev, N. Mezentsev, P. Piminov, D. Shatilov, P. Vobly, K. Zolotarev, I. Bozovic Jelisavcic, G. Kacarevic, S. Lukic, G. Milutinovic-Dumbelovic, M. Pandurovic, U. Iriso, F. Perez, M. Pont, J. Trenado, M. Aguilar-Benitez, J. Calero, L. Garcia-Tabares, D. Gavela, J. L. Gutierrez, D. Lopez, F. Toral, D. Moya, A. Ruiz Jimeno, I. Vila, T. Argyropoulos, C. Blanch Gutierrez, M. Boronat, D. Esperante, A. Faus-Golfe, J. Fuster, N. Fuster Martinez, N. Galindo Muñoz, I. García, J. Giner Navarro, E. Ros, M. Vos, R. Brenner, T. Ekelöf, M. Jacewicz, J. Ögren, M. Olvegård, R. Ruber, V. Ziemann, D. Aguglia, N. Alipour Tehrani, A. Andersson, F. Andrianala, F. Antoniou, K. Artoos, S. Atieh, R. Ballabriga Sune, M. J. Barnes, J. Barranco Garcia, H. Bartosik, C. Belver-Aguilar, A. Benot Morell, D. R. Bett, S. Bettoni, G. Blanchot, O. Blanco Garcia, X. A. Bonnin, O. Brunner, H. Burkhardt, S. Calatroni, M. Campbell, N. Catalan Lasheras, M. Cerqueira Bastos, A. Cherif, E. Chevallay, B. Constance, R. Corsini, B. Cure, S. Curt, B. Dalena, D. Dannheim, G. De Michele, L. De Oliveira, N. Deelen, J. P. Delahaye, T. Dobers, S. Doebert, M. Draper, F. Duarte Ramos, A. Dubrovskiy, K. Elsener, J. Esberg, M. Esposito, V. Fedosseev, P. Ferracin, A. Fiergolski, K. Foraz, A. Fowler, F. Friebel, J-F. Fuchs, C. A. Fuentes Rojas, A. Gaddi, L. Garcia Fajardo, H. Garcia Morales, C. Garion, L. Gatignon, J-C. Gayde, H. Gerwig, A. N. Goldblatt, C. Grefe, A. Grudiev, F. G. Guillot-Vignot, M. L. Gutt-Mostowy, M. Hauschild, C. Hessler, J. K. Holma, E. Holzer, M. Hourican, D. Hynds, Y. Inntjore Levinsen, B. Jeanneret, E. Jensen, M. Jonker, M. Kastriotou, J. M. K. Kemppinen, R. B. Kieffer, W. Klempt, O. Kononenko, A. Korsback, E. Koukovini Platia, J. W. Kovermann, C-I. Kozsar, I. Kremastiotis, S. Kulis, A. Latina, F. Leaux, P. Lebrun, T. Lefevre, L. Linssen, X. Llopart Cudie, A. A. Maier, H. Mainaud Durand, E. Manosperti, C. Marelli, E. Marin Lacoma, R. Martin, S. Mazzoni, G. Mcmonagle, O. Mete, L. M. Mether, M. Modena, R. M. Münker, T. Muranaka, E. Nebot Del Busto, N. Nikiforou, D. Nisbet, J-M. Nonglaton, F. X. Nuiry, A. Nürnberg, M. Olvegard, J. Osborne, S. Papadopoulou, Y. Papaphilippou, A. Passarelli, M. Patecki, L. Pazdera, D. Pellegrini, K. Pepitone, E. Perez Codina, A. Perez Fontenla, T. H. B. Persson, M. Petrič, F. Pitters, S. Pittet, F. Plassard, R. Rajamak, S. Redford, Y. Renier, S. F. Rey, G. Riddone, L. Rinolfi, E. Rodriguez Castro, P. Roloff, C. Rossi, V. Rude, G. Rumolo, A. Sailer, E. Santin, D. Schlatter, H. Schmickler, D. Schulte, N. Shipman, E. Sicking, R. Simoniello, P. K. Skowronski, P. Sobrino Mompean, L. Soby, M. P. Sosin, S. Sroka, S. Stapnes, G. Sterbini, R. Ström, I. Syratchev, F. Tecker, P. A. Thonet, L. Timeo, H. Timko, R. Tomas Garcia, P. Valerio, A. L. Vamvakas, A. Vivoli, M. A. Weber, R. Wegner, M. Wendt, B. Woolley, W. Wuensch, J. Uythoven, H. Zha, P. Zisopoulos, M. Benoit, M. Vicente Barreto Pinto, M. Bopp, H. H. Braun, M. Csatari Divall, M. Dehler, T. Garvey, J. Y. Raguin, L. Rivkin, R. Zennaro, A. Aksoy, Z. Nergiz, E. Pilicer, I. Tapan, O. Yavas, V. Baturin, R. Kholodov, S. Lebedynskyi, V. Miroshnichenko, S. Mordyk, I. Profatilova, V. Storizhko, N. Watson, A. Winter, J. Goldstein, S. Green, J. S. Marshall, M. A. Thomson, B. Xu, W. A. Gillespie, R. Pan, M. A Tyrk, D. Protopopescu, A. Robson, R. Apsimon, I. Bailey, G. Burt, D. Constable, A. Dexter, S. Karimian, C. Lingwood, M. D. Buckland, G. Casse, J. Vossebeld, A. Bosco, P. Karataev, K. Kruchinin, K. Lekomtsev, L. Nevay, J. Snuverink, E. Yamakawa, V. Boisvert, S. Boogert, G. Boorman, S. Gibson, A. Lyapin, W. Shields, P. Teixeira-Dias, S. West, R. Jones, N. Joshi, R. Bodenstein, P. N. Burrows, G. B. Christian, D. Gamba, C. Perry, J. Roberts, J. A. Clarke, N. A. Collomb, S. P. Jamison, B. J. A. Shepherd, D. Walsh, M. Demarteau, J. Repond, H. Weerts, L. Xia, J. D. Wells, C. Adolphsen, T. Barklow, M. Breidenbach, N. Graf, J. Hewett, T. Markiewicz, D. McCormick, K. Moffeit, Y. Nosochkov, M. Oriunno, N. Phinney, T. Rizzo, S. Tantawi, F. Wang, J. Wang, G. White, M. Woodley

The Compact Linear Collider (CLIC) is a multi-TeV high-luminosity linear e+e- collider under development. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and operated in a staged approach with three centre-of-mass energy stages ranging from a few hundred GeV up to 3 TeV. The first stage will focus on precision Standard Model physics, in particular Higgs and top-quark measurements. Read More

The Pixel Detector of the ATLAS experiment has shown excellent performance during the whole Run-1 of LHC. Taking advantage of the long shutdown, the detector was extracted from the experiment and brought to surface, to equip it with new service quarter panels, to repair the modules and to ease installation of the Insertable B-Layer (IBL). The IBL is a fourth layer of pixel detectors, and has been installed in May 2014 between the existing Pixel Detector and a new smaller radius beam-pipe at a radius of 3. Read More

Two special calorimeters are foreseen for the instrumentation of the very forward region of an ILC or CLIC detector; a luminometer (LumiCal) designed to measure the rate of low angle Bhabha scattering events with a precision better than 10$^{-3}$ at the ILC and 10$^{-2}$ at CLIC, and a low polar-angle calorimeter (BeamCal). The latter will be hit by a large amount of beamstrahlung remnants. The intensity and the spatial shape of these depositions will provide a fast luminosity estimate, as well as determination of beam parameters. Read More

2012Apr
Affiliations: 1II. Physikalisches Institut, Georg-August-Universität Göttingen, Germany, 2Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany, 3Max-Planck-Institut für Physik, München, Germany, 4CERN, Genève, Switzerland, 5Laboratoire de Physique Nucleaire et de Hautes Énergies, 6Laboratoire de Physique Nucleaire et de Hautes Énergies, 7CERN, Genève, Switzerland, 8II. Physikalisches Institut, Georg-August-Universität Göttingen, Germany, 9CERN, Genève, Switzerland, 10Institut de Física d'Altes Energies, 11Division of elementary particle physics - Institute of Physics of the Academy of Sciences of the Czech Republic, Prague, Czech Republic, 12CERN, Genève, Switzerland, 13Tokyo Institute Of Technology, Tokyo, Japan, 14Tokyo Institute Of Technology, Tokyo, Japan, 15Section de Physique, 16Deutsches Elektronen-Synchrotron, 17Max-Planck-Institut für Physik, München, Germany, 18Laboratoire de Physique Nucleaire et de Hautes Énergies, 19CERN, Genève, Switzerland, 20Tokyo Institute Of Technology, Tokyo, Japan, 21CERN, Genève, Switzerland, 22Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany, 23Deutsches Elektronen-Synchrotron, 24Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany, 25High Energy Accelerator Research Organization, Tsukuba, Japan, 26Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany, 27Institut de Física d'Altes Energies, 28The University of Liverpool, Liverpool, United Kingdom, 29High Energy Accelerator Research Organization, Tsukuba, Japan, 30Max-Planck-Institut für Physik, München, Germany, 31Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany

Results of beam tests with planar silicon pixel sensors aimed towards the ATLAS Insertable B-Layer and High Luminosity LHC (HL-LHC) upgrades are presented. Measurements include spatial resolution, charge collection performance and charge sharing between neighbouring cells as a function of track incidence angle for different bulk materials. Measurements of n-in-n pixel sensors are presented as a function of fluence for different irradiations. Read More

The Littlest Higgs with T-parity Model (LHT) is one of the attractive candidates of physics beyond the Standard Model. In this study we focus on heavy gauge bosons and heavy leptons that LHT imposes, which are detectable at ILC. The mass and couplings of these particles possess important information of the model's mass generation mechanism and how they interact with other particles. Read More

One of candidates for the International Linear Collider(ILC)'s vertex detector is the Fine Pixel CCD (FPCCD) with a pixel size of 5 \times 5 (\mum^2). Sensor and readout systems are currently being studied and prototypes have been developed. In this paper we will report on the performance of latest developed readout ASIC prototype as well as the outline of the design strategy for the next ASIC prototype. Read More

The large hadron collider (LHC) is anticipated to provide signals of new physics at the TeV scale, which are likely to involve production of a WIMP dark matter candidate. The international linear collider (ILC) is to sort out these signals and lead us to some viable model of the new physics at the TeV scale. In this article, we discuss how the ILC can discriminate new physics models, taking the following three examples: the inert Higgs model, the supersymmetric model, and the littlest Higgs model with T-parity. Read More

Measurement of the Higgs coupling to W-bosons is an important test of our understanding of the electroweak symmetry breaking mechanism. We study the sensitivity of the International Linear Collider (ILC) to the presence of anomalous HW+W- couplings using ZH -> nu nu WW* -> nu nu 4j events. Using an effective Lagrangian approach, we calculate the differential decay rates of the Higgs boson including the effects of new dimension-5 operators. Read More

2010Nov
Authors: T. Abe, I. Adachi, K. Adamczyk, S. Ahn, H. Aihara, K. Akai, M. Aloi, L. Andricek, K. Aoki, Y. Arai, A. Arefiev, K. Arinstein, Y. Arita, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Balagura, Y. Ban, E. Barberio, T. Barvich, K. Belous, T. Bergauer, V. Bhardwaj, B. Bhuyan, S. Blyth, A. Bondar, G. Bonvicini, A. Bozek, M. Bracko, J. Brodzicka, O. Brovchenko, T. E. Browder, G. Cao, M. -C. Chang, P. Chang, Y. Chao, V. Chekelian, A. Chen, K. -F. Chen, P. Chen, B. G. Cheon, C. -C. Chiang, R. Chistov, K. Cho, S. -K. Choi, K. Chung, A. Comerma, M. Cooney, D. E. Cowley, T. Critchlow, J. Dalseno, M. Danilov, A. Dieguez, A. Dierlamm, M. Dillon, J. Dingfelder, R. Dolenec, Z. Dolezal, Z. Drasal, A. Drutskoy, W. Dungel, D. Dutta, S. Eidelman, A. Enomoto, D. Epifanov, S. Esen, J. E. Fast, M. Feindt, M. Fernandez Garcia, T. Fifield, P. Fischer, J. Flanagan, S. Fourletov, J. Fourletova, L. Freixas, A. Frey, M. Friedl, R. Fruehwirth, H. Fujii, M. Fujikawa, Y. Fukuma, Y. Funakoshi, K. Furukawa, J. Fuster, N. Gabyshev, A. Gaspar de Valenzuela Cueto, A. Garmash, L. Garrido, Ch. Geisler, I. Gfall, Y. M. Goh, B. Golob, I. Gorton, R. Grzymkowski, H. Guo, H. Ha, J. Haba, K. Hara, T. Hara, T. Haruyama, K. Hayasaka, K. Hayashi, H. Hayashii, M. Heck, S. Heindl, C. Heller, T. Hemperek, T. Higuchi, Y. Horii, W. -S. Hou, Y. B. Hsiung, C. -H. Huang, S. Hwang, H. J. Hyun, Y. Igarashi, C. Iglesias, Y. Iida, T. Iijima, M. Imamura, K. Inami, C. Irmler, M. Ishizuka, K. Itagaki, R. Itoh, M. Iwabuchi, G. Iwai, M. Iwai, M. Iwasaki, M. Iwasaki, Y. Iwasaki, T. Iwashita, S. Iwata, H. Jang, X. Ji, T. Jinno, M. Jones, T. Julius, T. Kageyama, D. H. Kah, H. Kakuno, T. Kamitani, K. Kanazawa, P. Kapusta, S. U. Kataoka, N. Katayama, M. Kawai, Y. Kawai, T. Kawasaki, J. Kennedy, H. Kichimi, M. Kikuchi, C. Kiesling, B. K. Kim, G. N. Kim, H. J. Kim, H. O. Kim, J. -B. Kim, J. H. Kim, M. J. Kim, S. K. Kim, K. T. Kim, T. Y. Kim, K. Kinoshita, K. Kishi, B. Kisielewski, K. Kleese van Dam, J. Knopf, B. R. Ko, M. Koch, P. Kodys, C. Koffmane, Y. Koga, T. Kohriki, S. Koike, H. Koiso, Y. Kondo, S. Korpar, R. T. Kouzes, Ch. Kreidl, M. Kreps, P. Krizan, P. Krokovny, H. Krueger, A. Kruth, W. Kuhn, T. Kuhr, R. Kumar, T. Kumita, S. Kupper, A. Kuzmin, P. Kvasnicka, Y. -J. Kwon, C. Lacasta, J. S. Lange, I. -S. Lee, M. J. Lee, M. W. Lee, S. -H. Lee, M. Lemarenko, J. Li, W. D. Li, Y. Li, J. Libby, A. Limosani, C. Liu, H. Liu, Y. Liu, Z. Liu, D. Liventsev, A. Lopez Virto, Y. Makida, Z. P. Mao, C. Marinas, M. Masuzawa, D. Matvienko, W. Mitaroff, K. Miyabayashi, H. Miyata, Y. Miyazaki, T. Miyoshi, R. Mizuk, G. B. Mohanty, D. Mohapatra, A. Moll, T. Mori, A. Morita, Y. Morita, H. -G. Moser, D. Moya Martin, T. Mueller, D. Muenchow, J. Murakami, S. S. Myung, T. Nagamine, I. Nakamura, T. T. Nakamura, E. Nakano, H. Nakano, M. Nakao, H. Nakazawa, S. -H. Nam, Z. Natkaniec, E. Nedelkovska, K. Negishi, S. Neubauer, C. Ng, J. Ninkovic, S. Nishida, K. Nishimura, E. Novikov, T. Nozaki, S. Ogawa, K. Ohmi, Y. Ohnishi, T. Ohshima, N. Ohuchi, K. Oide, S. L. Olsen, M. Ono, Y. Ono, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, H. Park, H. K. Park, L. S. Peak, T. Peng, I. Peric, M. Pernicka, R. Pestotnik, M. Petric, L. E. Piilonen, A. Poluektov, M. Prim, K. Prothmann, K. Regimbal, B. Reisert, R. H. Richter, J. Riera-Babures, A. Ritter, A. Ritter, M. Ritter, M. Roehrken, J. Rorie, M. Rosen, M. Rozanska, L. Ruckman, S. Rummel, V. Rusinov, R. M. Russell, S. Ryu, H. Sahoo, K. Sakai, Y. Sakai, L. Santelj, T. Sasaki, N. Sato, Y. Sato, J. Scheirich, J. Schieck, C. Schwanda, A. J. Schwartz, B. Schwenker, A. Seljak, K. Senyo, O. -S. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, H. Shibuya, S. Shiizuka, J. -G. Shiu, B. Shwartz, F. Simon, H. J. Simonis, J. B. Singh, R. Sinha, M. Sitarz, P. Smerkol, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, J. Stypula, Y. Suetsugu, S. Sugihara, T. Sugimura, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Y. Suzuki, H. Takagaki, F. Takasaki, H. Takeichi, Y. Takubo, M. Tanaka, S. Tanaka, N. Taniguchi, E. Tarkovsky, G. Tatishvili, M. Tawada, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, T. Tsuboyama, K. Tsunada, Y. -C. Tu, T. Uchida, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. Vahsen, M. Valentan, P. Vanhoefer, G. Varner, K. E. Varvell, P. Vazquez, I. Vila, E. Vilella, A. Vinokurova, J. Visniakov, M. Vos, C. H. Wang, J. Wang, M. -Z. Wang, P. Wang, A. Wassatch, M. Watanabe, Y. Watase, T. Weiler, N. Wermes, R. E. Wescott, E. White, J. Wicht, L. Widhalm, K. M. Williams, E. Won, H. Xu, B. D. Yabsley, H. Yamamoto, H. Yamaoka, Y. Yamaoka, M. Yamauchi, Y. Yin, H. Yoon, J. Yu, C. Z. Yuan, Y. Yusa, D. Zander, M. Zdybal, Z. P. Zhang, J. Zhao, L. Zhao, Z. Zhao, V. Zhilich, P. Zhou, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. Read More

Two special calorimeters are foreseen for the instrumentation of the very forward region of the ILC detector, a luminometer designed to measure the rate of low angle Bhabha scattering events with a precision better than 10-3 and a low polar angle calorimeter, adjacent to the beam-pipe. The latter will be hit by a large amount of beamstrahlung remnants. The amount and shape of these depositions will allow a fast luminosity estimate and the determination of beam parameters. Read More

We study the capability of the international linear collider (ILC) to probe extra dimensions via the seesaw mechanism. In the scenario we study, heavy Kaluza-Klein neutrinos generate tiny neutrino masses and, at the same time, have sizable couplings to the standard-model particles. Consequently, a Kaluza-Klein tower of heavy neutrinos (N) can be produced and studied at the ILC through the process: e+e- -> vN followed by N -> Wl decay. 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

Fine pixel CCD (FPCCD) is an option for the sensor used for the ILC vertex detector to reduce the pixel occupancy due to the high background rate near the interaction point. In this paper, we report on the R&D status of FPCCD sensors and the R&D plan for the sensors and the cooling system. Read More

We investigate the possibility of the identification of TeV physics models including WIMP dark matter at the International Linear Collider. Many TeV physics models contain a WIMP dark matter (chi^0) and charged new particle (chi^{pm}) which interacts with the WIMP dark matter via the vertex chi^{pm} chi^0 W^{mp}. Through Monte Carlo simulations, we study the process, e^+e^- to chi^+ chi^- to chi^0 chi^0 W^+ W^-, because the signal contains the fruitful information of the model. Read More

Identification of beyond-standard-models including WIMP dark matter is studied in four particle final state with a W boson pair and a WIMP pair at the International Linear Collider. Models with different spin structures give distinguishable production angle distributions. After the mass determination in each model, the production angle is reconstructed using the four momentum of W bosons with a back-to-back constraint. Read More

One of the main purposes on physics at the International Linear Collider (ILC) is to study the property of dark matter such as its mass, spin, and interactions between the dark matter and particles in the standard model. Among those, the interaction between dark matter and higgs boson is important, because, if the dark matter is a weakly interacting massive particle, the existence of the dark matter is expected to relate to physics of electroweak symmetry breaking. In addition, the interaction plays an important role at direct detection experiments of dark matter. Read More

We fabricated a readout ASIC with the fully depleted silicon-on-insulator (FD-SOI) technology for the pair-monitor. The pair-monitor is a silicon pixel device that measures the beam profile of the international linear collider. It utilizes the directional distribution of a large number of electron-positron pairs created by collision of bunches, and is required to tolerate radiation dose of about a few Mrad/year. Read More

We are developing the vertex detector with a fine pixel CCD (FPCCD) for the international linear collider (ILC), whose pixel size is $5 \times 5$ $\mu$m$^{2}$. To evaluate the performance of the FPCCD vertex detector and optimize its design, development of the software dedicated for the FPCCD is necessary. We, therefore, started to develop the software for FPCCD. Read More

The measurement of the Higgs coupling to W bosons is an important program at the international linear collider (ILC) to search for the anomaly in the coupling to the gauge bosons. We study the sensitivity of ILC to the Higgs anomalous coupling to W bosons by using ZH->vvWW* events. In this article, we report the status of the study. Read More

The Littlest Higgs Model with T-parity is one of the attractive candidates of physics beyond the Standard Model. One of the important predictions of the model is the existence of new heavy gauge bosons, where they acquire mass terms through the breaking of global symmetry necessarily imposed on the model. The determination of the masses are, hence, quite important to test the model. Read More

Measurement of the cross-section of ee->ZHH offers the information of the trilinear Higgs self-coupling, which is important to confirm the mechanism of the electro-weak symmetry breaking. Since there is huge background in the signal region, background rejection is key point to identify ZHH events. In this paper, we study the possibility to observe the $ZHH$ events at ILC by using ZHH->vvHH/qqHH events. Read More

The Littlest Higgs Model with T-parity is one of the attractive candidates of physics beyond the Standard Model. One of the important predictions of the model is the existence of new heavy gauge bosons, where they acquire mass terms through the breaking of global symmetry necessarily imposed on the model. The determination of the masses are, hence, quite important to test the model. Read More

We investigate a possibility of precision measurements for parameters of the Littlest Higgs model with T-parity at the International Linear Collider (ILC). The model predicts new gauge bosons which masses strongly depend on the vacuum expectation value that breaks a global symmetry of the model. Through Monte Carlo simulations of production processes of new gauge bosons, we show that these masses can be determined very accurately at the ILC for a representative parameter point of the model. Read More

As a candidate of the vertex detector for experiments at ILC, fully depleted fine pixel CCDs (FPCCDs) are under development. We describe the basic concept of the FPCCD and report on preliminary results of the performance study of the first prototype FPCCD sensors. Read More

Little Higgs scenario provides us a new solution for the hierarchy problem of the Standard Model. The Littlest Higgs model with T-parity, which is one of models in the scenario, solves the dark matter problem in our universe. In this talk, we discuss how accurately the property of the dark matter is determined at linear collides. Read More

In the Littlest Higgs model with T-parity, we study production processes of new gauge bosons at the international linear collider (ILC). Through Monte Carlo simulations of the production processes, we show that the heavy gauge boson masses can be determined very accurately at the ILC for a representative parameter point of the model. From the simulation result, we also discuss the determination of other model parameters at the ILC. Read More

We investigate a possibility to measure parameters of the Littlest Higgs model with T-parity at the ILC with sqrt(s) = 500 GeV. The model predicts new gauge bosons (AH, ZH, and WH), among which the heavy photon (AH) is a candidate for dark matter. Through Monte Carlo simulations of the process of e+ e- -> AH ZH, we show that the masses can be determined with accuracies of 16. Read More

At the International Linear Collider (ILC), measurement of the beam profile at the interaction point (IP) is a key issue to achieve high luminosity. We studied the beam size measurement by combination of Pair Monitor and BeamCal. We obtained measurement accuracies of 2. Read More

At the international linear collider, measurement of the beam profile at the interaction point is a key issue to achieve high luminosity. We report a simulation study on a new beam profile monitor, called the pair monitor, which uses the hit distribution of the electron-positron pairs generated at the interaction point. We obtained measurement accuracies of 5. Read More

We develop the vertex detector for the international linear collider (ILC) using the FPCCD (Fine Pixel CCD), whose pixel size is 5 x 5 um2. Together with the FPCCD sensor, a prototype of the readout ASIC was developed in 2008. The readout ASIC was confirmed to work correctly at slow readout speed (1. Read More

The pair monitor is a beam profile monitor at interaction point (IP) for the international linear collider (ILC). We have designed and developed the pair monitor as a silicon pixel sensor which is located at about 400 cm from IP. As the first step to develop the pair monitor, the readout ASIC was developed. Read More

Measurement of the cross-section of e+e- -> ZHH offers the information of the trilinear Higgs self-coupling, which is important to confirm the mechanism of the electro-weak symmetry breaking. Since there is huge background in the signal region, background rejection is key point to identify ZHH events. In this paper, we study the possibility to observe the ZHH events at ILC by using ZHH -> nu nu HH, resulting 4 jets. Read More

We investigate a possibility of precision measurements for parameters of the Littlest Higgs model with T-parity at the International Linear Collider (ILC). The model predicts new gauge bosons (AH, ZH, and WH), among which the heavy photon (AH) is a candidate for dark matter. The masses of these new gauge bosons strongly depend on the vacuum expectation value that breaks a global symmetry of the model. Read More