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Production of charmed mesons in Z decays

Research output: Contribution to journalJournal article

  • ALEPH Collaboration
<mark>Journal publication date</mark>1994
<mark>Journal</mark>Zeitschrift für Physik C Particles and Fields
Issue number1
Number of pages14
Pages (from-to)1-14
<mark>Original language</mark>English


The production of charmed mesons D0(−) ,D ± , andD *± is studied in a sample of 478,000 hadronicZ decays. The production rates are measured to be Γ(Z→D∗±X)Γhad=0.187±0.015(exp.)±0.013(BR),\hfillΓ(Z→D±X)Γhad=0.251±0.026(exp.)±0.025(BR),\hfillΓ(Z→D0(−)X)Γhad=0.518±0.052(exp.)±0.035(BR),\hfill where the errors from this analysis are separated from those coming from theD branching ratios (BR). TheD *± momentum distribution is extracted separately for Z→ccˉ and Z→bbˉ events with the help of event shape variables. It is consistent with the prediction of the JETSET Monte Carlo program after adjustment of the charm fragmentation function. Constraining the shape of the Z→bbˉ contribution, the average fraction of the beam energy taken by aD * meson produced in the fragmentation of a charm quark is extracted by a parametric fit to be <X E > c =0.495±0.011±0.007. Evidence forD **0 (D 1(2420)0 and/orD 2 *(2460)0) production is found in the D∗±π∓ channel, accounting for a fraction (18±5±2)% of allD *± production. The relative production of vector and pseudoscalar mesons is dicussed, together with the possible effects ofD ** production. Thec-quark forward-backwardZ-pole asymmetry is detrmined from that of high momentumD *± to beA FB 0,c =(7.7±4.4)%.