TY  - JOUR
AU  - BABAR Collaboration (del Amo Sanchez, P. et al
AU  - Azzolini, V.
AU  - Lopez-March, N.
AU  - Martinez-Vidal, F.
AU  - Milanes, D. A.
AU  - Oyanguren, A.
PY  - 2010
DA  - 2010//
TI  - Test of Lepton Universality in Y(1S) Decays at BABAR
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 191801
EP  - 7pp
VL  - 104
IS  - 19
PB  - Amer Physical Soc
AB  - 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 μ(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.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1002.4358
UR  - https://doi.org/10.1103/PhysRevLett.104.191801
DO  - 10.1103/PhysRevLett.104.191801
LA  - English
N1  - ISI:000277699600013
ID  - BABARCollaborationdelAmoSanchez_etal2010
ER  -