Akademska digitalna zbirka SLovenije - logo
E-resources
Full text
Open access
  • Measurement of the \(\tau\)-lepton lifetime at Belle
    Aihara, H; Asner, D M; Bakich, A M; Bhuyan, B; Bobrov, A; Bondar, A; Bračko, M; Chen, A; Chilikin, K; Chistov, R; Doležal, Z; Dutta, D; Eidelman, S; Epifanov, D; Farhat, H; Fast, J E; Ferber, T; Gaur, V; Ganguly, S; Garmash, A; Gillard, R; Goh, Y M; Golob, B; Hayasaka, K; Hayashii, H; Hoshi, Y; Iijima, T; Ishikawa, A; Itoh, R; Jaegle, I; Julius, T; Kato, E; Kichimi, H; Kim, D Y; Kim, J B; Kinoshita, K; Ko, B R; Križan, P; Kuhr, T; Y -J Kwon; Lange, J S; S -H Lee; Liventsev, D; Lukin, P; Matvienko, D; Mohanty, G B; Mori, T; Mussa, R; Nagasaka, Y; Nedelkovska, E; C Ng; Nishida, S; Nitoh, O; Ogawa, S; Olsen, S L; Ostrowicz, W; Pakhlova, G; Park, C W; Pedlar, T K; Pestotnik, R; Petrič, M; Piilonen, L E; Ritter, M; Röhrken, M; Sahoo, H; Sakai, Y; Sandilya, S; Santel, D; Santelj, L; Semmler, D; Seon, O; Shebalin, V; Shen, C P; Sibidanov, A; Simon, F; Y -S Sohn; Stanič, S; Starič, M; Steder, M; Trabelsi, K; Uchida, M; Uglov, T; Unno, Y; Uno, S; Usov, Y; Vahsen, S E; Vanhoefer, P; Varner, G; Varvell, K E; Vinokurova, A; Wagner, M N; Wang, C H; Wang, P; Watanabe, Y; Yamaoka, J; Yamashita, Y; Yashchenko, S; Yook, Y; Yuan, C Z; Zhilich, V

    arXiv.org, 10/2013
    Paper

    The lifetime of the \(\tau\)-lepton is measured using the process \(e^+e^-\rightarrow\tau^+\tau^-\), where both \(\tau\)-leptons decay to \(3\pi\nu_\tau\). The result for the mean lifetime, based on \(711\,\mathrm{fb}^{-1}\) of data collected with the Belle detector at the \(\Upsilon(4S)\) resonance and \(60\,\mathrm{MeV}\) below, is \(\tau = (290.17 \pm 0.53(\mathrm{stat.}) \pm 0.33(\mathrm{syst.}))\cdot10^{-15}\,\mathrm{s}\). The first measurement of the lifetime difference between \(\tau^+\) and \(\tau^-\) is performed. The upper limit on the relative lifetime difference between positive and negative \(\tau\)-leptons is \(|\Delta\tau| / \tau < 7.0 \times 10^{-3}\) at 90% CL.

Shelf entry