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.

D., B., I., D., D., D., P., G., C., G., J. P., L., et al. (1993). Measurement of the Ratio Gamma_b(b)bar/Gamma_had Using Event Shape Variables. PHYSICS LETTERS. SECTION B, 313, 549-563 [10.1016/0370-2693(93)90029-H].

Measurement of the Ratio Gamma_b(b)bar/Gamma_had Using Event Shape Variables

BOTTIGLI, UBALDO;CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
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.
1993
D., B., I., D., D., D., P., G., C., G., J. P., L., et al. (1993). Measurement of the Ratio Gamma_b(b)bar/Gamma_had Using Event Shape Variables. PHYSICS LETTERS. SECTION B, 313, 549-563 [10.1016/0370-2693(93)90029-H].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/36321
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