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Test of lepton universality in Υ(1S) decays at BABAR

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The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ+τ−/ΓΥ(1S)→μ+μ− is measured using a sample of (121.8±1.2)×106Υ(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...

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Main Authors: Amo Sanchez, Pablo del (Author) , Adametz, Aleksandra (Author) , Marks, Jörg (Author) , Schenk, Sebastian (Author) , Uwer, Ulrich (Author) , Hartmann, Thomas (Author) , Leddig, Torsten (Author) , Schröder, Henning (Author) , Waldi, Roland (Author)
Corporate Author: BABAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 14 May 2010
In: Physical review letters
Year: 2010, Volume: 104, Issue: 19, Pages: 1-7
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.191801
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.104.191801
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.104.191801
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Author Notes:BABAR Collaboration
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Summary:The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ+τ−/ΓΥ(1S)→μ+μ− is measured using a sample of (121.8±1.2)×106Υ(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, Rτμ(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 Description:BABAR Collaboration: P. del Amo Sanchez, A. Adametz, J. Marks, S. Schenk, U. Uwer, T. Hartmann, T. Leddig, H. Schröder, R. Waldi [und viele weitere]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.191801

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