Speaker
Fabio Anulli
(Universita e INFN, Roma I (IT))
Description
We present a test of lepton universality through the measurement of the ratio of the branching fraction for Υ(3S) decays into tau leptons to that for decays to a muon pair (R = BF(Y(3S)-> tau+tau-)/BF(Y(3S)->mu+mu-). A violation of lepton universality would be evidence of new physics, for example via the existence of a light CP-odd Higgs boson. This measurement, which makes use of a sample of Y(3S) decays corresponding to an integrated luminosity of 2.4 fb-1 collected by the BABAR detector at the PEP-II e+e- collider, represents a significant improvement upon the present precision of R.
Author
Fabio Anulli
(Universita e INFN, Roma I (IT))
