Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b -> tau(-) nubar_tau X branching ratio is measured to be 2.75 +/- 0.30 +/- 0.37%. In addition an upper limit of 1.8 x 10(-3) at 90% confidence level is placed upon the exclusive branching ratio of B- -> tau(-) nubar_tau. These measurements are consistent with SM expectations, and put the constraint tan(beta/M(h+/-)) < 0.52 GeV(-1) at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM).
Measurement of the b->tau- nubar_(tau) Branching Ratio and An Upper Limit On B- ->tau- nubar_tau
G. BATIGNANI;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;F. FORTI;MESSINEO, ALBERTO MARIA;G. RIZZO;TONELLI, GUIDO EMILIO;G. TRIGGIANI;
1995-01-01
Abstract
Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b -> tau(-) nubar_tau X branching ratio is measured to be 2.75 +/- 0.30 +/- 0.37%. In addition an upper limit of 1.8 x 10(-3) at 90% confidence level is placed upon the exclusive branching ratio of B- -> tau(-) nubar_tau. These measurements are consistent with SM expectations, and put the constraint tan(beta/M(h+/-)) < 0.52 GeV(-1) at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM).File in questo prodotto:
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