Measurement of the b → τ- ν -τX branching ratio and an upper limit on B- → τ- ν -τ
D Buskulic, D Casper, I De Bonis, D Decamp, P Ghez, C Goy, JP Lees, MN Minard, P Odier, B Pietrzyk, F Ariztizabal, M Chmeissani, JM Crespo, I Efthymiopoulos, E Fernandez, M Fernandez-Bosman, V Gaitan, L Garrido, M Martinez, S Orteu Show all
Physics Letters B | Published : 1995
Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b → τ- ν -τX 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 B- → τ- ν -τ. These measurements are consistent with SM expectations, and put the constraint tan β Mh± < 0.52 GeV-1 at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM). © 1995.