The branching fraction of Z --> bbBAR relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z --> bbBAR events. The method chosen applies a combination of shape discriminators and the selection of high transverse momentum leptons to event hemispheres. From a sample of 440000 hadronic Z decays collected with the ALEPH detector at LEP, the ratio GAMMA(bbBAR)/GAMMA(had) = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured. RI ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Ferrante, Isidoro/F-1017-2012
MEASUREMENT OF THE RATIO GAMMA-B(B)BAR/GAMMA HAD USING EVENT SHAPE VARIABLES
ROLANDI, LUIGI;LIGABUE, FRANCO;LUSIANI, Alberto;
1993
Abstract
The branching fraction of Z --> bbBAR relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z --> bbBAR events. The method chosen applies a combination of shape discriminators and the selection of high transverse momentum leptons to event hemispheres. From a sample of 440000 hadronic Z decays collected with the ALEPH detector at LEP, the ratio GAMMA(bbBAR)/GAMMA(had) = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured. RI ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Ferrante, Isidoro/F-1017-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
