Journal article
Heavy flavour production in Z decays
D Decamp, B Deschizeaux, C Goy, JP Lees, MN Minard, JM Crespo, M Delfino, E Fernandez, P Mato, R Miguel, LM Mir, S Orteu, A Pacheco, JA Perlas, E Tubau, MG Catanesi, M de Palma, A Farilla, G Iaselli, G Maggi Show all
Physics Letters B | Published : 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 predic..
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