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Measurement of the τ -lepton Lifetime at Belle

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posted on 2024-08-06, 09:46 authored by K. Belous, M. Shapkin, A. Sokolov, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, A. M. Bakich, A. Bala, B. Bhuyan, A. Bobrov, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, Z. Doležal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, S. Ganguly, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, Y. Hoshi, W.-S. Hou, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, T. Iwashita, I. Jaegle, T'Mir Julius, E. Kato, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, A. Kuzmin, Y.-J. Kwon, J. S. Lange, S.-H. Lee, J. Libby, D. Liventsev, P. Lukin, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, T. Mori, R. Mussa, Y. Nagasaka, E. Nakano, M. Nakao, M. Nayak, E. Nedelkovska, C. Ng, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, S. L. Olsen, W. Ostrowicz, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, O. Seon, V. Shebalin, C. P. Shen, T.-A. Shibata, J.-G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y.-S. Sohn, S. Stanič, M. Starič, M. Steder, T. Sumiyoshi, U. Tamponi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, Y. Yamashita, S. Yashchenko, Y. Yook, C. Z. Yuan, Z. P. Zhang, V. Zhilich, A. Zupanc
The lifetime of the τ lepton is measured using the process e+e-→τ+τ-, where both τ leptons decay to 3πντ. The result for the mean lifetime, based on 711 fb-1 of data collected with the Belle detector at the Ï (4S) resonance and 60 MeV below, is τ=(290. 17±0.53(stat)±0.33(syst))×10-15 s. The first measurement of the lifetime difference between τ+ and τ- is performed. The upper limit on the relative lifetime difference between positive and negative τ leptons is |Δτ|/τ<7.0×10-3 at 90% C.L.

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ISSN

0031-9007

Journal title

Physical Review Letters

Volume

112

Issue

3

Article number

article no. 031801

Publisher

American Physical Society

Copyright statement

Copyright © 2014 American Physical Society. The published version is reproduced in accordance with the copyright policy of the publisher.

Language

eng

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