From an analysis of inclusive leptons in data collected by the ALEPH detector at LEP, we measure the fractions of b bbar and c cbar events in hadronic Z decays. The b bbar fraction times semileptonic branching ratio is measured to be Br(b->e)xGamma_bbar/Gamma_had=0.0224 +/- 0.0016 +/- 0.0010. Assuming a b semileptonic branching ratio of 0.102 +/- 0.010 gives Gamma_bbar/Gamma_had=0.220 +/- 0.016 +/- 0.024, in good agreement with the standard model prediction of 0.217. The c cbar fraction times semileptonic branching ratio is measured to be Br(c->e)xGamma_ccbar/Gamma_had = 0.0133 +/- 0.0040 + 0.0038 -0.0031. Assuming a c semileptonic branching ratio of 0.090+/- 0.013 gives Gamma_bbar/Gamma_had=0.148 +/- 0.044 + 0.045 -0.038, in agreement with the standard model prediction of 0.171.

D., D., B., D., C., G., J. P., L., M. N., M., J. M., C., et al. (1990). Heavy Flavor Production In Z Decays. PHYSICS LETTERS. SECTION B, 244(3-4), 551-565 [10.1016/0370-2693(90)90362-A].

Heavy Flavor Production In Z Decays

CIOCCI, MARIA AGNESE;BOTTIGLI, UBALDO;MARROCCHESI, PIER SIMONE;
1990-01-01

Abstract

From an analysis of inclusive leptons in data collected by the ALEPH detector at LEP, we measure the fractions of b bbar and c cbar events in hadronic Z decays. The b bbar fraction times semileptonic branching ratio is measured to be Br(b->e)xGamma_bbar/Gamma_had=0.0224 +/- 0.0016 +/- 0.0010. Assuming a b semileptonic branching ratio of 0.102 +/- 0.010 gives Gamma_bbar/Gamma_had=0.220 +/- 0.016 +/- 0.024, in good agreement with the standard model prediction of 0.217. The c cbar fraction times semileptonic branching ratio is measured to be Br(c->e)xGamma_ccbar/Gamma_had = 0.0133 +/- 0.0040 + 0.0038 -0.0031. Assuming a c semileptonic branching ratio of 0.090+/- 0.013 gives Gamma_bbar/Gamma_had=0.148 +/- 0.044 + 0.045 -0.038, in agreement with the standard model prediction of 0.171.
1990
D., D., B., D., C., G., J. P., L., M. N., M., J. M., C., et al. (1990). Heavy Flavor Production In Z Decays. PHYSICS LETTERS. SECTION B, 244(3-4), 551-565 [10.1016/0370-2693(90)90362-A].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38439
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