2010/11/30 by Zhi Yang, Xing-Gang Wu, Li-Cheng Deng +2 · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-011-1563-z
published as Eur.Phys.J.C71:1563,2011 · 8 pages, 5 figures and 2 tables. basic formulae in the appendix are cut off to match the published version, which can be found in v1. to be published in Eur.Phys.J.C
arxiv created 2011/02/03 · arxiv updated 2011/03/28
In Ref.[7],we have dealt with the production of the two color-singlet S-wave (cb)-quarkonium states Bc(|(cb)\bf 1[1S0]>) and B^*c(|(cb)\bf 1[3S1]>) through the Z0 boson decays. As an important sequential work, we make a further discussion on the production of the more complicated P-wave excited (cb)-quarkonium states, i.e. |(cb)\bf 1[1P1]> and |(cb)\bf 1[3PJ]> (with J=(1,2,3)). More over, we also calculate the channel with the two color-octet quarkonium states |(cb)\bf 8[1S0]g> and |(cb)\bf 8[3S1]g>, whose contributions to the decay width maybe at the same order of magnitude as that of the color-singlet P-wave states according to the naive nonrelativistic quantum chromodynamics scaling rules. The P-wave states shall provide sizable contributions to the Bc production, whose decay width is about 20% of the total decay width ΓZ0→ Bc. After summing up all the mentioned (cb)-quarkonium states' contributions, we obtain ΓZ0→ Bc =235.9+352.8-122.0 KeV, where the errors are caused by the main uncertainty sources.