학술논문

Measurement of Michel Parameters ($\bar\eta$, $\xi\kappa$) in the radiative leptonic decay of tau at Belle
Document Type
Working Paper
Author
The Belle CollaborationAbdesselam, A.Adachi, I.Adamczyk, K.Aihara, H.Said, S. AlArinstein, K.Arita, Y.Asner, D. M.Aso, T.Atmacan, H.Aulchenko, V.Aushev, T.Ayad, R.Aziz, T.Babu, V.Badhrees, I.Bahinipati, S.Bakich, A. M.Bala, A.Ban, Y.Bansal, V.Barberio, E.Barrett, M.Bartel, W.Bay, A.Behera, P.Belhorn, M.Belous, K.Berger, M.Besson, D.Bhardwaj, V.Bhuyan, B.Biswal, J.Bloomfield, T.Blyth, S.Bobrov, A.Bondar, A.Bonvicini, G.Bookwalter, C.Boulahouache, C.Bozek, A.Bračko, M.Breibeck, F.Brodzicka, J.Browder, T. E.Waheed, E.Červenkov, D.Chang, M. -C.Chang, P.Chao, Y.Chekelian, V.Chen, A.Chen, K. -F.Chen, P.Cheon, B. G.Chilikin, K.Chistov, R.Cho, K.Chobanova, V.Choi, S. -K.Choi, Y.Cinabro, D.Crnkovic, J.Dalseno, J.Danilov, M.Dash, N.Di Carlo, S.Dingfelder, J.Doležal, Z.Dossett, D.Drásal, Z.Drutskoy, A.Dubey, S.Dutta, D.Dutta, K.Eidelman, S.Epifanov, D.Farhat, H.Fast, J. E.Feindt, M.Ferber, T.Frey, A.Frost, O.Fulsom, B. G.Gaur, V.Gabyshev, N.Ganguly, S.Garmash, A.Getzkow, D.Gillard, R.Giordano, F.Glattauer, R.Goh, Y. M.Goldenzweig, P.Golob, B.Greenwald, D.Perdekamp, M. GrosseGrygier, J.Grzymkowska, O.Guan, Y.Guo, H.Haba, J.Hamer, P.Han, Y. L.Hara, K.Hara, T.Hasegawa, Y.Hasenbusch, J.Hayasaka, K.Hayashii, H.He, X. H.Heck, M.Hedges, M. T.Heffernan, D.Heider, M.Heller, A.Higuchi, T.Himori, S.Hirose, S.Horiguchi, T.Hoshi, Y.Hoshina, K.Hou, W. -S.Hsiung, Y. B.Hsu, C. -L.Huschle, M.Hyun, H. J.Igarashi, Y.Iijima, T.Imamura, M.Inami, K.Inguglia, G.Ishikawa, A.Itagaki, K.Itoh, R.Iwabuchi, M.Iwasaki, M.Iwasaki, Y.Iwata, S.Jacobs, W. W.Jaegle, I.Jeon, H. B.Jin, Y.Joffe, D.Jones, M.Joo, K. K.Julius, T.Kakuno, H.Kaliyar, A. B.Kang, J. H.Kang, K. H.Kapusta, P.Kataoka, S. U.Kato, E.Kato, Y.Katrenko, P.Kawai, H.Kawasaki, T.Keck, T.Kichimi, H.Kiesling, C.Kim, B. H.Kim, D. Y.Kim, H. J.Kim, H. -J.Kim, J. B.Kim, J. H.Kim, K. T.Kim, M. J.Kim, S. H.Kim, S. K.Kim, Y. J.Kinoshita, K.Kleinwort, C.Klucar, J.Ko, B. R.Kobayashi, N.Koblitz, S.Kodyš, P.Koga, Y.Korpar, S.Kotchetkov, D.Kouzes, R. T.Križan, P.Krokovny, P.Kronenbitter, B.Kuhr, T.Kulasiri, R.Kumar, R.Kumita, T.Kurihara, E.Kuroki, Y.Kuzmin, A.Kvasnička, P.Kwon, Y. -J.Lai, Y. -T.Lange, J. S.Lee, D. H.Lee, I. S.Lee, S. -H.Leitgab, M.Leitner, R.Levit, D.Lewis, P.Li, C. H.Li, H.Li, J.Li, L.Li, X.Li, Y.Gioi, L. LiLibby, J.Limosani, A.Liu, C.Liu, Y.Liu, Z. Q.Liventsev, D.Loos, A.Louvot, R.Lubej, M.Lukin, P.Luo, T.MacNaughton, J.Masuda, M.Matsuda, T.Matvienko, D.Matyja, A.McOnie, S.Mikami, Y.Miyabayashi, K.Miyachi, Y.Miyake, H.Miyata, H.Miyazaki, Y.Mizuk, R.Mohanty, G. B.Mohanty, S.Mohapatra, D.Moll, A.Moon, H. K.Mori, T.Morii, T.Moser, H. -G.Müller, T.Muramatsu, N.Mussa, R.Nagamine, T.Nagasaka, Y.Nakahama, Y.Nakamura, I.Nakamura, K. R.Nakano, E.Nakano, H.Nakano, T.Nakao, M.Nakayama, H.Nakazawa, H.Nanut, T.Nath, K. J.Natkaniec, Z.Nayak, M.Nedelkovska, E.Negishi, K.Neichi, K.Ng, C.Niebuhr, C.Niiyama, M.Nisar, N. K.Nishida, S.Nishimura, K.Nitoh, O.Nozaki, T.Ogawa, A.Ogawa, S.Ohshima, T.Okuno, S.Olsen, S. L.Ono, Y.Onuki, Y.Ostrowicz, W.Oswald, C.Ozaki, H.Pakhlov, P.Pakhlova, G.Pal, B.Palka, H.Panzenböck, E.Park, C. -S.Park, C. W.Park, H.Park, K. S.Paul, S.Peak, L. S.Pedlar, T. K.Peng, T.Pesántez, L.Pestotnik, R.Peters, M.Petrič, M.Piilonen, L. E.Poluektov, A.Prasanth, K.Prim, M.Prothmann, K.Pulvermacher, C.Purohit, M. V.Rauch, J.Reisert, B.Ribežl, E.Ritter, M.Rorie, J.Rostomyan, A.Rozanska, M.Rummel, S.Ryu, S.Sahoo, H.Saito, T.Sakai, K.Sakai, Y.Sandilya, S.Santel, D.Santelj, L.Sanuki, T.Sasaki, J.Sasao, N.Sato, Y.Savinov, V.Schlüter, T.Schneider, O.Schnell, G.Schönmeier, P.Schram, M.Schwanda, C.Schwartz, A. J.Schwenker, B.Seidl, R.Seino, Y.Semmler, D.Senyo, K.Seon, O.Seong, I. S.Sevior, M. E.Shang, L.Shapkin, M.Shebalin, V.Shen, C. P.Shibata, T. -A.Shibuya, H.Shimizu, N.Shinomiya, S.Shiu, J. -G.Shwartz, B.Sibidanov, A.Simon, F.Singh, J. B.Sinha, R.Smerkol, P.Sohn, Y. -S.Sokolov, A.Soloviev, Y.Solovieva, E.Stanič, S.Starič, M.Steder, M.Strube, J. F.Stypula, J.Sugihara, S.Sugiyama, A.Sumihama, M.Sumisawa, K.Sumiyoshi, T.Suzuki, K.Suzuki, S.Suzuki, S. Y.Suzuki, Z.Takeichi, H.Takizawa, M.Tamponi, U.Tanaka, M.Tanaka, S.Tanida, K.Taniguchi, N.Taylor, G. N.Tenchini, F.Teramoto, Y.Tikhomirov, I.Trabelsi, K.Trusov, V.Tsuboyama, T.Uchida, M.Uchida, T.Uehara, S.Ueno, K.Uglov, T.Unno, Y.Uno, S.Uozumi, S.Urquijo, P.Ushiroda, Y.Usov, Y.Vahsen, S. E.Van Hulse, C.Vanhoefer, P.Varner, G.Varvell, K. E.Vervink, K.Vinokurova, A.Vorobyev, V.Vossen, A.Wagner, M. N.Wang, C. H.Wang, J.Wang, M. -Z.Wang, P.Wang, X. L.Watanabe, M.Watanabe, Y.Wedd, R.Wehle, S.White, E.Widmann, E.Wiechczynski, J.Williams, K. M.Won, E.Yabsley, B. D.Yamada, S.Yamamoto, H.Yamaoka, J.Yamashita, Y.Yamauchi, M.Yashchenko, S.Ye, H.Yelton, J.Yook, Y.Yuan, C. Z.Yusa, Y.Zhang, C. C.Zhang, L. M.Zhang, Z. P.Zhao, L.Zhilich, V.Zhukova, V.Zhulanov, V.Ziegler, M.Zivko, T.Zupanc, A.Zwahlen, N.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We present the first measurement of the Michel parameters $\bar{\eta}$ and $\xi\kappa$ in the radiative leptonic decay of the $\tau$ lepton using 703 f$\mathrm{b}^{-1}$ 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 $e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0 \bar{\nu})(l^-\nu\bar{\nu}\gamma)$ $(l=e$ or $\mu)$. The preliminary values of the measured Michel parameters are $\bar{\eta} = -2.0 \pm 1.5 \pm 0.8$ and $\xi\kappa = 0.6 \pm 0.4 \pm 0.2$, where the first error is statistical and the second is systematic.