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Measurement of the $\tau$-lepton lifetime at Belle

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arxiv 1310.8503 v1 pith:CSLTPRKN submitted 2013-10-31 hep-ex

Belle Collaboration: K. Belous , M. Shapkin , A. Sokolov , I. Adachi , H. Aihara , D. M. Asner , V. Aulchenko , A. M. Bakich
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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. 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
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keywords lifetimemathrmbelledifferenceleptonleptonsmeasurementbelow
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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.

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