Lepton Universality Test in Upsilon(1S) decays at BaBar
Abstract
Using a sample of 122 million Upsilon(3S) decays collected with the BaBar detector at the PEP-II asymmetric energy collider at the SLAC National Accelerator Laboratory, we measure the ratio R_taumu=BR(Upsilon(1S)->tau^+tau^-)/BR(Upsilon(1S)->mu^+mu^-); the measurement is intended as a test of lepton universality and as a possible search for a light pseudoscalar Higgs boson in Next to Minimal Supersymmetric Standard Model (NMSSM) scenarios. Such a boson could appear in a deviation of the ratio R_taumu from the Standard Model expectation, that is 1, except for small lepton mass corrections. The analysis exploits the decays Upsilon(3S) -> Upsilon(1S) pi^+pi^-, Upsilon(1S) -> l^+l^-, where l = mu, tau.
Cite
@article{arxiv.0910.0423,
title = {Lepton Universality Test in Upsilon(1S) decays at BaBar},
author = {Elisa Guido},
journal= {arXiv preprint arXiv:0910.0423},
year = {2019}
}
Comments
5 pages, 4 figures. To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726