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

del Amo Sanchez, P. et al. (2010) Test of Lepton Universality in Υ(1S) Decays at BABAR. Physical Review Letters, 104 (19). p. 191801. ISSN 0031-9007

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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 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 Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 07 Jul 2011 11:41
Last Modified: 28 Aug 2021 11:08


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