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Title

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

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC; Oyanguren, Arantza CSIC ORCID; Lees, J. P.; Sánchez, P. D.
Issue Date14-May-2010
PublisherAmerican Physical Society
CitationPhysical Review Letters 104 (19): 191801 (2010)
AbstractThe ratio R-tau mu(Y(1S)) = Gamma Y(1S)->tau(+)tau(-)/Gamma(+)(-)(Y(1S)->mu)(mu) is measured using a sample of (121.8 +/- 1.2) x 10(6)Y(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 Y(3S) -> Y(1S)pi(+)pi(-), Y(1S) -> l(+)l(-), where l = mu, tau. The result, R-tau mu (Y(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.
Publisher version (URL)http://dx.doi.org/ 10.1103/PhysRevLett.104.191801
URIhttp://hdl.handle.net/10261/24988
DOI10.1103/PhysRevLett.104.191801
ISSN0031-9007
Appears in Collections:(IFIC) Artículos

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