The branching fraction of Z -> b (b) over bar relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z -> b(b) over bar 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_b(b) over bar/GAMMA_had = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured.
Measurement of the Ratio Gamma_b(b)bar/Gamma_had Using Event Shape Variables
BATIGNANI, GIOVANNI;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;FORTI, FRANCESCO;GIORGI, MARCELLO;MESSINEO, ALBERTO MARIA;RIZZO, GIULIANA;TONELLI, GUIDO EMILIO;G. TRIGGIANI;
1993-01-01
Abstract
The branching fraction of Z -> b (b) over bar relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z -> b(b) over bar 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_b(b) over bar/GAMMA_had = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured.File in questo prodotto:
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