Measurement of the b ---> tau- anti-tau-neutrino X branching ratio and an upper limit on B- ---> tau- anti-tau-neutrino

UNSPECIFIED (1995) Measurement of the b ---> tau- anti-tau-neutrino X branching ratio and an upper limit on B- ---> tau- anti-tau-neutrino. Physics Letters B, 343 (1-4). pp. 444-452. ISSN 0370-2693

Abstract

Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the branching ratio is measured to be 2.75 ± 0.30 ± 0.37%. In addition an upper limit of 1.8 × 10−3 at 90% confidence level is placed upon the exclusive branching ratio of . These measurements are consistent with SM expectations, and put the constraint tan GeV−1 at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM).