Inclusive branching ratios involving b --> T transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b --> T-(v) over bar (T) X) and the semi-inclusive branching ratio BR(b --> T-(v) over bar D-T*X+/-) are measured to be (2.43 +/- 0.20 +/- 0.25)% and (0.88 +/- 0.31 +/- 0.28)%, in agreement with the standard model predictions, Upper limits. on the branching fractions BR(B- --> T- (v) over bar (T)) and BR(b --> sv (v) over bar) are set to 8.3 x 10(-4) and 6.4 x 10(-4) at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV / c(2))(-1) to be set on the tan beta / m(H)+/- ratio, in the framework of type-II two-Higgs-doublet models. RI ANTONELLI, ANTONELLA/C-6238-2011; Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010
Titolo: | Measurements of BR(b ->tau(-)(nu)over-bar(tau)X) and BR(b ->tau(-)(nu)over-bar(tau)D(*+/-)X) and upper limits on BR(B-->tau(-)(nu)over-bar(tau)) and BR(b -> s nu(nu)over-bar) |
Autori interni: | |
Data di pubblicazione: | 2001 |
Rivista: | |
Abstract: | Inclusive branching ratios involving b --> T transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b --> T-(v) over bar (T) X) and the semi-inclusive branching ratio BR(b --> T-(v) over bar D-T*X+/-) are measured to be (2.43 +/- 0.20 +/- 0.25)% and (0.88 +/- 0.31 +/- 0.28)%, in agreement with the standard model predictions, Upper limits. on the branching fractions BR(B- --> T- (v) over bar (T)) and BR(b --> sv (v) over bar) are set to 8.3 x 10(-4) and 6.4 x 10(-4) at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV / c(2))(-1) to be set on the tan beta / m(H)+/- ratio, in the framework of type-II two-Higgs-doublet models. RI ANTONELLI, ANTONELLA/C-6238-2011; Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010 |
Handle: | http://hdl.handle.net/20.500.11769/13524 |
Appare nelle tipologie: | 1.1 Articolo in rivista |