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Test of Lepton Universality in Υ(1S) Decays at BABAR

del Amo Sanchez, P. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2010) Test of Lepton Universality in Υ(1S) Decays at BABAR. Physical Review Letters, 104 (19). Art. No. 191801 . ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20100610-152817289

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Abstract

The ratio R_(τμ)(Υ(1S)) = Γ_(Υ(1S)→τ^+^τ-)/Γ_(Υ(1S)→μ^+μ^-) is measured using a sample of (121.8±1.2) × 10^(6)Υ(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays Υ(3S)→Υ(1S)π^+π^-, Υ(1S)→l^+l^-, where l = μ, τ. The result, R_(τμ)(Υ(1S)) = 1.005±0.013(stat)±0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.104.191801DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.104.191801PublisherUNSPECIFIED
Additional Information:© 2010 American Physical Society. Received 24 February 2010; published 14 May 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Commissariat à l'Énergie Atomique (CEA) (France)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS-IN2P3) (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF) (Germany)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG) (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN) (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (FOM) (The Netherlands)UNSPECIFIED
Research Council of Norway (NFR)UNSPECIFIED
Ministry of Education and Science of the Russian Federation (MES)UNSPECIFIED
Ministerio de Educación y Ciencia (MEC) (Spain)UNSPECIFIED
Science and Technology Facilities Council (STFC) (United Kingdom)UNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Classification Code:PACS: 13.20.Gd, 12.60.Fr, 14.80.Ec
Record Number:CaltechAUTHORS:20100610-152817289
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100610-152817289
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18646
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:11 Jun 2010 20:24
Last Modified:26 Dec 2012 12:08

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