PT Journal
AU BABAR Collaboration (Lees, JPea
   Azzolini, V
   Lopez-March, N
   Martinez-Vidal, F
   Milanes, DA
   Oyanguren, A
TI Search for Charged Lepton Flavor Violation in Narrow Gamma Decays
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2010
BP 151802
EP 7pp
VL 104
IS 15
DI 10.1103/PhysRevLett.104.151802
LA English
AB Charged-lepton flavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99 x 10(6)Gamma(2S) decays and 117 x 10(6)Gamma(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B(Gamma(nS) --> e(+/-)tau(-/+)) and B(Gamma(n(S) --> mu(+/-)tau(-/+)) (n = 2, 3) at the 10(-6) level and use these results to place lower limits of order 1 TeV on the mass scale of charged-lepton flavor-violating effective operators.
ER