(2010) Test of Lepton universality in Y(1S) decays at BABAR. Physical Review Letters, Vol.104 (No.19). article no. v. doi:10.1103/PhysRevLett.104.191801

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Abstract

The 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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	14 May 2010
Dates:	Date Event 14 May 2010 Published
Volume:	Vol.104
Number:	No.19
Number of Pages:	7
Page Range:	article no. v
DOI:	10.1103/PhysRevLett.104.191801
Status:	Peer Reviewed
Publication Status:	Published
Funder:	DOE, NSF (USA), NSERC (Canada), CEA, CNRS- IN2P3 (France), BMBF, DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), European Union, A.P. Sloan Foundation

Data sourced from Thomson Reuters' Web of Knowledge

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