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Measurement of the branching fraction of B^+ -> tau^+ nu_tau decays with the semileptonic tagging method

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arxiv 1503.05613 v2 pith:QTLBFEDX submitted 2015-03-18 hep-ex

Measurement of the branching fraction of B^+ -> tau^+ nu_tau decays with the semileptonic tagging method

Belle Collaboration: B. Kronenbitter , M. Heck , P. Goldenzweig , T. Kuhr , A. Abdesselam , I. Adachi , H. Aihara , S. Al Said
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K. Arinstein D. M. Asner T. Aushev R. Ayad T. Aziz A. M. Bakich V. Bansal E. Barberio V. Bhardwaj A. Bondar G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov J. Dingfelder Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber O. Frost B. G. Fulsom V. Gaur N. Gabyshev A. Garmash D. Getzkow R. Gillard R. Glattauer B. Golob J. Grygier K. Hayasaka H. Hayashii X. H. He M. Heider A. Heller T. Horiguchi M. Huschle T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle K. K. Joo T. Julius K. H. Kang E. Kato D. Y. Kim H. J. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita B. R. Ko P. Kody\v{s} P. Kri\v{z}an P. Krokovny A. Kuzmin Y.-J. Kwon J. S. Lange D. H. Lee I. S. Lee P. Lewis L. Li Gioi J. Libby D. Liventsev P. Lukin D. Matvienko H. Miyata R. Mizuk G. B. Mohanty S. Mohanty A. Moll H. K. Moon R. Mussa E. Nakano M. Nakao T. Nanut Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Okuno S. L. Olsen W. Ostrowicz C. Oswald P. Pakhlov G. Pakhlova H. Park T. K. Pedlar L. Pes\'antez R. Pestotnik M. Petri\v{c} L. E. Piilonen C. Pulvermacher E. Ribe\v{z}l M. Ritter A. Rostomyan S. Ryu Y. Sakai L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell M. Schram C. Schwanda K. Senyo O. Seon M. E. Sevior V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} M. Steder T. Sumiyoshi U. Tamponi Y. Teramoto K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse P. Vanhoefer G. Varner A. Vinokurova A. Vossen M. N. Wagner C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe K. M. Williams E. Won H. Yamamoto S. Yashchenko Y. Yook Z. P. Zhang V. Zhilich V. Zhulanov M. Ziegler A. Zupanc
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classification hep-ex
keywords branchingfractiondecaydecaysmeasurementsemileptonicaccompanyingagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report a measurement of the branching fraction of B^+ -> tau^+ nu_tau decays using a data sample of 772 x 10^6 BBbar pairs, collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the recoiling B candidate in the decay channel B^+ -> tau^+ nu_tau. We obtain a branching fraction of BR(B^+ -> tau^+ nu_tau) = [1.25 +- 0.28 (stat.) +- 0.27 (syst.)] x 10^-4. This result is in good agreement with previous measurements and the expectation from the calculation based on the Standard Model.

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