Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

  • Shimizu, N.
  • Aihara, H.
  • Epifanov, D.
  • Adachi, I.
  • Al Said, S.
  • ... Kim, D. Y.
  • 외 165명
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초록

We present a measurement of the Michel parameters of the tau lepton, (eta) over bar and xi kappa, in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu) over bar (l)gamma using 711 fb(-1) of collision data collected with the Belle detector at the KEKB e(+)e(-) collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e(+)e(-) -> tau(+)tau(-) -> (pi(+)pi(0)(nu) over bar (tau))(l(-)nu(tau)(nu) over bar (l)gamma) (l = e or mu). The measured values of the Michel parameters are (eta) over bar = - 1.3 +/- 1.5 +/- 0.8 and xi kappa = 0.5 +/- 0.4 +/- 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties, and constrain the coupling constants of the generalized weak interaction.

키워드

MU-MESON DECAYBELLE DETECTORIDENTIFICATIONANNIHILATIONLIBRARYTRIGGERKEKB
제목
Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma
저자
Shimizu, N.Aihara, H.Epifanov, D.Adachi, I.Al Said, S.Asner, D. M.Aulchenko, V.Aushev, T.Ayad, R.Babu, V.Badhrees, I.Bakich, A. M.Bansal, V.Barberio, E.Bhardwaj, V.Bhuyan, B.Biswal, J.Bobrov, A.Bozek, A.Bracko, M.Browder, T. E.Cervenkov, D.Chang, M. -C.Chang, P.Chekelian, V.Chen, A.Cheon, B. G.Chilikin, K.Cho, K.Choi, S. -K.Choi, Y.Cinabro, D.Czank, T.Dash, N.Di Carlo, S.Dolezal, Z.Dutta, D.Eidelman, S.Fast, J. E.Ferber, T.Fulsom, B. G.Garg, R.Gaur, V.Gabyshev, N.Garmash, A.Gelb, M.Goldenzweig, P.Greenwald, D.Guido, E.Haba, J.Hayasaka, K.Hayashii, H.Hedges, M. T.Hirose, S.Hou, W. -S.Iijima, T.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, M.Jaegle, I.Jeon, H. B.Jia, S.Jin, Y.Joo, K. K.Julius, T.Kang, K. H.Karyan, G.Kawasaki, T.Kiesling, C.Kim, D. Y.Kim, J. B.Kim, S. H.Kim, Y. J.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Kroeger, R.Krokovny, P.Kulasiri, R.Kuzmin, A.Kwon, Y. -J.Lange, J. S.Lee, I. S.Li, L. K.Li, Y.Gioi, L. LiLibby, J.Liventsev, D.Masuda, M.Merola, M.Miyabayashi, K.Miyata, H.Mohanty, G. B.Moon, H. K.Mori, T.Mussa, R.Nakano, E.Nakao, M.Nanut, T.Nath, K. J.Natkaniec, Z.Nayak, M.Niiyama, M.Nisar, N. K.Nishida, S.Ogawa, S.Okuno, S.Ono, H.Pakhlova, G.Pal, B.Park, C. W.Park, H.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Popov, V.Ritter, M.Rostomyan, A.Sakai, Y.Salehi, M.Sandilya, S.Sato, Y.Savinov, V.Schneider, O.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shebalin, V.Shibata, T. -A.Shiu, J. -G.Shwartz, B.Sokolov, A.Solovieva, E.Staric, M.Strube, J. F.Sumisawa, K.Sumiyoshi, T.Tamponi, U.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Uglov, T.Unno, Y.Uno, S.Usov, Y.Van Hulse, C.Varner, G.Vorobyev, V.Vossen, A.Wang, C. H.Wang, M. -Z.Wang, P.Watanabe, M.Widmann, E.Won, E.Yamashita, Y.Ye, H.Yuan, C. Z.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.
DOI
10.1093/ptep/pty003
발행일
2018-02
유형
Article
저널명
Progress of Theoretical and Experimental Physics
2