Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b -> τ-ντX 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-ντ. 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).
Measurement of the branching ratio and an upper limit on
GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1995-01-01
Abstract
Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b -> τ-ντX 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-ντ. 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).File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
