Determination of P(c ---> D*+) and BR(c ---> lepton+) at LEP-1

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2000) European Physical Journal C. Particles and Fields — Vol. 12, n° 2, p. 209-224 (2000)

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Abstract
The probability P(c→D∗+) that a charm quark fragments into a D∗+ meson and the c→l+ semileptonic branching fraction were measured in Z0 decay into ccˉ events. From the analysis of 3.5 Million Z0 events collected from 1992 to 1995, a sample of charm meson decays with 81% ccˉ purity was selected. The product of the c→D∗+ fragmentation probability times the D∗+→D0π+ branching fraction was measured to be: P(c→D∗+)⋅BR(D∗+→D0π+)=0.174±0.010(stat)±0.004(syst). Using the world averaged value for BR(D∗+→D0π+) , the fragmentation probability is inferred: P(c→D∗+)=0.255±0.015(stat)±0.006(syst)±0.005(syst.BR). From the same sample, 1828±51 identified leptons in the opposite hemisphere were selected. From this sample, the charm semileptonic branching fraction was measured to be: BR(c→l+)=0.0958±0.0042(stat)±0.0028(syst).
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2000). Determination of P(c ---> D*+) and BR(c ---> lepton+) at LEP-1. European Physical Journal C. Particles and Fields, 12(2), 209-224. https://doi.org/10.1007/s100529900227 (Original work published 2000)