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

Heavy flavour production in Z decays / Decamp, D., Deschizeaux, B., Goy, C., Lees, J.-P., Minard, M.-N., Crespo, J.M., Delfino, M., Fernandez, E., Mato, P., Miguel, R., Mir, Ll.M., Orteu, S., Pacheco, A., Perlas, J.A., Tubau, E., Catanesi, M.G., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 244:3-4(1990), pp. 551-565. [10.1016/0370-2693(90)90362-A]

Heavy flavour production in Z decays

Iaselli, G.;Maggi, G.;
1990

Abstract

From an analysis of inclusive leptons in data collected by the ALEPH detector at LEP, we measure the fractions of bb and cc events in hadronic Z decays. The bb fraction times semileptonic branching ratio is measured to be Br(b → e)·Γbb/Γhad = 0.0224 ± 0.0016 ± 0.0010. Assuming a b semileptonic branching ratio of 0.102 ± 0.010 gives Γbb/Γhad = 0.220 ± 0.016 ± 0.024, in good agreement with the standard model prediction of 0.217. The cc fraction times semileptonic branching ratio is measured to be Br(c → e)·Γcc/Γhad = 0.0133 ± 0.0040-0.0031 +0.0038. Assuming a c semileptonic branching ratio of 0.090 ± 0.013 gives Γcc/Γhad = 0.148 ± 0.044-0.038 +0.045, in agreement with the standard model prediction of 0.171.
1990
Heavy flavour production in Z decays / Decamp, D., Deschizeaux, B., Goy, C., Lees, J.-P., Minard, M.-N., Crespo, J.M., Delfino, M., Fernandez, E., Mato, P., Miguel, R., Mir, Ll.M., Orteu, S., Pacheco, A., Perlas, J.A., Tubau, E., Catanesi, M.G., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 244:3-4(1990), pp. 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/11589/7693
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