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Evidence of B+→τ+ν decays with hadronic B tags

Lees, J. P. and Chao, D. S. and Cheng, C. H. and Echenard, B. and Flood, K. T. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2013) Evidence of B+→τ+ν decays with hadronic B tags. Physical Review D, 88 (3). Art. No. 031102. ISSN 2470-0010. doi:10.1103/PhysRevD.88.031102. https://resolver.caltech.edu/CaltechAUTHORS:20131011-103526971

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Abstract

We present a search for the decay B+→τ+ν using 467.8×10^6 BB̅ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B- in the hadronic decay mode (B-→D(*)0X- and B-→J/ψX-). We examine the rest of the event to search for a B+→τ+ν decay. We identify the τ+ lepton in the following modes: τ+→e+νν̅ , τ+→μ+νν̅ , τ+→π+ν̅ and τ+→ρ+ν̅ . We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8σ (including systematic uncertainties) and corresponds to a branching fraction value of B(B+→τ+ν)=(1.83_(-0.49)^(+0.53)(stat)±0.24(syst))×10^(-4).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.88.031102 DOIArticle
http://link.aps.org/doi/10.1103/PhysRevD.88.031102PublisherArticle
http://arxiv.org/abs/1207.0698arXivDiscussion Paper
ORCID:
AuthorORCID
Cheng, C. H.0000-0002-8382-0447
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
Additional Information:© 2013 American Physical Society. Received 8 July 2012; published 8 August 2013. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovación (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (USA) and the Binational Science Foundation (USA-Israel).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Russian Federation Ministry of Education and ScienceUNSPECIFIED
Ministerio de Ciencia e Innovación (MICINN)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Issue or Number:3
Classification Code:PACS: 13.20.-v, 13.25.Hw
DOI:10.1103/PhysRevD.88.031102
Record Number:CaltechAUTHORS:20131011-103526971
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131011-103526971
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41890
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Oct 2013 20:56
Last Modified:10 Nov 2021 04:35

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