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Published August 8, 2013 | Version Submitted + Published
Journal Article Open

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

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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).

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).

Attached Files

Published - PhysRevD.88.031102.pdf

Submitted - 1207.0698v1.pdf

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1207.0698v1.pdf

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Additional details

Identifiers

Eprint ID
41890
Resolver ID
CaltechAUTHORS:20131011-103526971

Related works

Describes
http://arxiv.org/abs/1207.0698 (URL)

Funding

Department of Energy (DOE)
NSF
Natural Sciences and Engineering Research Council of Canada (NSERC)
Commissariat à l'Energie Atomique (CEA)
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
Bundesministerium für Bildung und Forschung (BMBF)
Deutsche Forschungsgemeinschaft (DFG)
Istituto Nazionale di Fisica Nucleare (INFN)
Stichting voor Fundamenteel Onderzoek der Materie (FOM)
Research Council of Norway
Russian Federation Ministry of Education and Science
Ministerio de Ciencia e Innovación (MICINN)
Science and Technology Facilities Council (STFC)
Marie Curie Fellowship
Alfred P. Sloan Foundation
Binational Science Foundation (USA-Israel)

Dates

Created
2013-10-11
Created from EPrint's datestamp field
Updated
2021-11-10
Created from EPrint's last_modified field