Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b --> tau(-) ($) over bar V(tau)X branching ratio is measured to be 2.75 +/- 0.30 +/- 0.37%. In addition an upper limit of 1.8 x 10(-3) at 90% confidence level is placed upon the exclusive branching ratio of B- --> tau(-)($) over bar V-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(-)(NU)OVER-BAR-(TAU)X BRANCHING RATIO AND AN UPPER LIMIT ON B--]TAU(-)(NU)OVER-BAR-(TAU)

SELVAGGI, Giovanna;NUZZO, Salvatore Vitale;DE PALMA, Mauro
1995-01-01

Abstract

Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b --> tau(-) ($) over bar V(tau)X branching ratio is measured to be 2.75 +/- 0.30 +/- 0.37%. In addition an upper limit of 1.8 x 10(-3) at 90% confidence level is placed upon the exclusive branching ratio of B- --> tau(-)($) over bar V-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).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/59355
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