학술논문

Measurement of the $\tau$-lepton lifetime at Belle
Document Type
Working Paper
Author
Belle CollaborationBelous, K.Shapkin, M.Sokolov, A.Adachi, I.Aihara, H.Asner, D. M.Aulchenko, V.Bakich, A. M.Bala, A.Bhuyan, B.Bobrov, A.Bondar, A.Bonvicini, G.Bozek, A.Bračko, M.Browder, T. E.Červenkov, D.Chekelian, V.Chen, A.Cheon, B. G.Chilikin, K.Chistov, R.Cho, K.Chobanova, V.Choi, Y.Cinabro, D.Dalseno, J.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.Haba, J.Hara, T.Hayasaka, K.Hayashii, H.Hoshi, Y.Hou, W. -S.Iijima, T.Inami, K.Ishikawa, A.Itoh, R.Iwashita, T.Jaegle, I.Julius, T.Kato, E.Kichimi, H.Kiesling, C.Kim, D. Y.Kim, H. J.Kim, J. B.Kim, M. J.Kim, Y. J.Kinoshita, K.Ko, B. R.Kodyš, P.Korpar, S.Križan, P.Krokovny, P.Kuhr, T.Kuzmin, A.Kwon, Y. -J.Lange, J. S.Lee, S. -H.Libby, J.Liventsev, D.Lukin, P.Matvienko, D.Miyata, H.Mizuk, R.Mohanty, G. B.Mori, T.Mussa, R.Nagasaka, Y.Nakano, E.Nakao, M.Nayak, M.Nedelkovska, E.Ng, C.Nisar, N. K.Nishida, S.Nitoh, O.Ogawa, S.Okuno, S.Olsen, S. L.Ostrowicz, W.Pakhlova, G.Park, C. W.Park, H.Park, H. K.Pedlar, T. K.Pestotnik, R.Petrič, M.Piilonen, L. E.Ritter, M.Röhrken, M.Rostomyan, A.Ryu, S.Sahoo, H.Saito, T.Sakai, Y.Sandilya, S.Santel, D.Santelj, L.Sanuki, T.Savinov, V.Schneider, O.Schnell, G.Schwanda, C.Semmler, D.Senyo, K.Seon, O.Shebalin, V.Shen, C. P.Shibata, T. -A.Shiu, J. -G.Shwartz, B.Sibidanov, A.Simon, F.Sohn, Y. -S.Stanič, S.Starič, M.Steder, M.Sumiyoshi, T.Tamponi, U.Tatishvili, G.Teramoto, Y.Trabelsi, K.Tsuboyama, T.Uchida, M.Uehara, S.Uglov, T.Unno, Y.Uno, S.Usov, Y.Vahsen, S. E.Van Hulse, C.Vanhoefer, P.Varner, G.Varvell, K. E.Vinokurova, A.Vorobyev, V.Wagner, M. N.Wang, C. H.Wang, P.Watanabe, M.Watanabe, Y.Williams, K. M.Won, E.Yamaoka, J.Yamashita, Y.Yashchenko, S.Yook, Y.Yuan, C. Z.Zhang, Z. P.Zhilich, V.Zupanc, A.
Source
Phys. Rev. Lett. 112, 031801 (2014)
Subject
High Energy Physics - Experiment
Language
Abstract
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.
Comment: 17 pages, 4 figures. Submitted to Phys. Rev. Lett