Measurement of Michel Parameters ($\bar\eta$, $\xi\kappa$) in the radiative leptonic decay of tau at Belle
A. Abdesselam, Y. Chao,S. Vahsen, H. Nakayama,S. Shinomiya, J. Crnkovic,S. L. Olsen, K. J. Nath,T. Uglov,H. Kakuno,E. Won,N. Gabyshev,D. Matvienko,R. Seidl,E. White,O. Grzymkowska,S. Okuno,K. Cho, C. Bookwalter,O. Frost,T. Iijima,M. Iwasaki, S. Yashchenko,Y. Watanabe,J. Li,L. Santelj,E. Widmann,H. Hayashii,H. Nakano, J. B. Kim,Y. Kato, Y. Sakai,J. Haba,S. Sugihara, A. Bay, M. Huschle,Y. Miyachi,K. Nishimura,T. Aushev,H. Nakazawa,G. Bonvicini,E. Solovieva, P. Kodys, G. Varner, Z. Natkaniec,J. G. Shiu,N. Taniguchi, D. Getzkow,M.T. Hedges,T. Schlüter,K. Nakamura,T. Nagamine,K. Neichi,K. Dutta,H. Miyata, M. Shapkin,Z. P. Zhang, D. Červenkov,T. Luo, E. Barberio,M. Nayak, Y. S. Sohn,S. Eidelman,R. Mussa, D. Greenwald,T. Zivko,H. Aihara,X. Li, Y. Ban, T. Sanuki,C. C. Zhang, B.H. Kim,H. K. Moon, D. Santel, J. Strube, T. Sumiyoshi,A. Chen, K. Prothmann, M. Starič,V. Chobanova,T. E. Browder,D. Besson,S. Rummel,Y. Ushiroda, J. Dalseno,C. H. Li,P. Pakhlov,D. M. Asner, Y. Nakahama, M. Iwabuchi,J. Rauch, K. Senyo,V. Bansal, Y. J. Kim, D. Semmler,Y. M. Goh,V. Shebalin,S. Ryu,C. H. Wang,Ihn Sik Seong,T. Uchida,A. Vossen,N. Kobayashi,P. Kapusta,V. Vorobyev,N. Muramatsu, C. R. Ng,I. Badhrees,M. Barrett, D. Kotchetkov, A. Kuzmin,Y. Liu,B. Bhuyan,S.-K. Choi, R. Louvot,T. Nanut,T. Hara,S. Mohanty,C. Pulvermacher,S. Stanič,T. Aso, M. V. Purohit,B. Pal,K. S. Park, J. Yelton,M. Uchida, K. Itagaki, P. K. Behera, D. Liventsev,B. R. Ko,H. Kichimi,H. Ye,M. Takizawa,S. Uehara,K. Hayasaka,I. S. Lee,D. Dutta,T. Mori,C. Z. Yuan,K. Hoshina, I. Jaegle,G. B. Mohanty, A. Garmash,H. Miyake,V. Zhukova,T. Tsuboyama,J. S. Lange, M. Jones, F. Breibeck, H. J. Hyun, M. Heider,K. Inami,M. Heck,Y. Miyazaki, Y. Guan, T. Bloomfield, K. Sakai,L. E. Piilonen,Z. Suzuki, J. Klucar, R. Gillard,A. Moll, A. Loos,I. Tikhomirov, P. Chen,W. W. Jacobs,T. Aziz,C. Boulahouache, P. Hamer,M. Imamura, J. Wiechczynski,M. Lubej,P. Lewis,Z. Doležal, S. Blyth, S. Hirose, K. M. Williams,C. L. Hsu,Paoti Chang,C. Oswald, K. Belous,T. Ferber, H. Takeichi,S. McOnie, V. Zhulanov,R. Ayad, H. J. Kim,X. Wang,M. Berger,T. Keck, A. Vinokurova,A. J. Schwartz,A. Heller,L.S. Peak,C. Liu,M. Grosse Perdekamp,D. Heffernan,F. Giordano, Y. Teramoto, K. T. Kim,C. Van Hulse,B. Kronenbitter, R. Itoh,J. Dingfelder,Lei Zhao,H. Palka, Y. Iwasaki,S. Suzuki, M. Danilov,A. Sokolov, H. Kawai, V. Savinov,P. Urquijo,R. Sinha,B. Yabsley, E. Nakano,H. G. Moser,S. Nishida, E. Ribežl,K. Negishi, S. K. Kim,A. M. Bakich,S. Di Carlo,M. Yamauchi,T. Morii, J. MacNaughton,H. Ozaki,L. Li Gioi, Y. Yamashita,Y. Usov,A. Poluektov, M. Petrič,K. Suzuki, Y. Yook, V. Chekelian,M. Masuda,J. Grygier, K. Sumisawa,M. Peters,Y. Koga,Richard T. Kouzes, R. Mizuk, Y. Choi, K. K. Joo,M. Ziegler,J. B. Singh, H. Park,L. M. Zhang,A.B. Kaliyar, T. Higuchi, R. Kulasiri, B. Schwenker,B. G. Cheon, K. Prasanth,E. Waheed, B. Shwartz,J. Hasenbusch,B. G. Fulsom, T. Saito, P. Vanhoefer,V. Zhilich, K. Hara,S. H. Lee, A. Limosani,S. Uno,X. H. He, T. Peng,A. Sugiyama,J. Sasaki, S. Korpar,B. Reisert,K. Adamczyk,Y. Kuroki,Tsuyoshi Horiguchi,J. Brodzicka,T. Matsuda,R. Leitner, D. Y. Kim,N. K. Nisar,Y. Hasegawa,O. Schneider,M. Wang, H. Li, H. Atmacan,O. Seon,M. E. Sevior,O. Nitoh,S. Ganguly,M. Watanabe,D. Levit, Y. Jin,U. Tamponi,H. Sahoo,S. Wehle,S. Yamada,Y. Mikami, M. Prim,C. W. Park, P. Križan,S.U. Kataoka,H. B. Jeon,T. Nozaki,Y. Soloviev, M. N. Wagner,T. Kawasaki, Y. Kwon,T. Nakano, A. Drutskoy, K. Chilikin, F. Tenchini, G. N. Taylor,W. Bartel,Th. Müller,S. Paul,M. Ritter,A. Bondar, N. Shimizu,S. Dubey,K. Trabelsi, D. Cinabro,J. Rorie,R. Wedd, M. Schram, V. Trusov, M. J. Kim,L. Li,K. E. Varvell,E. Kato,D. Joffe,T. Kumita,S. Sandilya,L. Pesántez, N. Sasao, S. Himori,C. Niebuhr, T. Ohshima, C. Kiesling, Y. Hoshi, Y. Onuki, M. Bračko,D. Epifanov, R. Pestotnik,Satoru Tanaka, H. Shibuya, V. Babu,S. Al Said,P. Lukin,K. Vervink, M. Tanaka, S. H. Kim,D. Dossett,C. S. Park,M. Leitgab, A. Bobrov, P. Wang,Zhiqing Liu,N. Zwahlen,A. Ogawa,B. Golob, K. Arinstein, J. Libby,A. Ishikawa,K. Tanida, A. Bozek,J. Biswal,A. Matyja,Shota Suzuki,G. Inguglia, M. Sumihama,J. Fast, P. Kvasnička,D. Mohapatra,S. Ogawa, P. Schönmeier,T. Julius,A. Rostomyan,A. Bala, Z. Drásal,T. K. Pedlar,K. Ueno, E. Panzenböck, W. Ostrowicz,H. Farhat, V. Aulchenko,M. Rozanska,K. Kinoshita, C. Kleinwort, E. Nedelkovska, I. Adachi, Y. Li,J. Yamaoka,V. Bhardwaj,V. Gaur, Y. Unno,K. H. Kang,P. Smerkol, K.-F. Chen, R. Chistov, M. Steder, M. Niiyama,E. Kurihara,Y. Igarashi, A. Zupanc, M. Nakao,M. Feindt, P. Goldenzweig, Y. Nagasaka,T.-A. Shibata,C. Schwanda, S. Koblitz,Y. Ono,D. H. Lee,R. Glattauer,Y. Arita, P. Krokovny,C. P. Shen,J. Stypula, J. H. Kim, H. Yamamoto, Y. Sato,F. Simon,N. Dash,I. Nakamura,H. Guo, Y. Seino, A. Sibidanov,T. Kuhr, K. Miyabayashi,S. Bahinipati, Y. Yusa,S. Iwata, G. Schnell, M. Belhorn,P. Katrenko,Y.-T. Lai,J. H. Kang,W.-S. Hou,M.-C. Chang,Y. Hsiung, R. Kumar,G. Pakhlova, J. Wang,A. Frey,L. Shang,S. Uozumi,Y.L. Han
Nuclear and Particle Physics Proceedings（2017）
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摘要
We present the first measurement of the Michel parameters η‾ and ξκ in the radiative leptonic decay of the τ lepton using 703 fb-1 of data collected with the Belle detector at the KEKB e+e− collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e+e−→τ+τ−→(π+π0ν‾)(l−νν‾γ)(l=e or μ). The preliminary values of the measured Michel parameters are η‾=−2.0±1.5±0.8 and ξκ=0.6±0.4±0.2, where the first error is statistical and the second is systematic.
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关键词
Tau,Michel parameter,Leptonic decay,Belle
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