Production of the $P$-Wave Excited $B_c$-States through the $Z^0$ Boson Decays

Details Production of the $P$-Wave Excited $B_c$-States through the $Z^0$ Boson Decays Production of the $P$-Wave Excited $B_c$-States through the $Z^0$ Boson Decays

2010-11-27

arxiv.org/abs/1011.5961v2

Eur.Phys.J.C71:1563,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures and 2 tables. basic formulae in the appendix are cut off to match the published version, which can be found

Scientific paper

10.1140/epjc/s10052-011-1563-z

In Ref.[7],we have dealt with the production of the two color-singlet $S$-wave $(c\bar{b})$-quarkonium states $B_c(|(c\bar{b})_{\bf 1}[^1S_0]>)$ and $B^*_c(|(c\bar{b})_{\bf 1}[^3S_1]>)$ through the $Z^0$ boson decays. As an important sequential work, we make a further discussion on the production of the more complicated $P$-wave excited $(c\bar{b})$-quarkonium states, i.e. $|(c\bar{b})_{\bf 1}[^1P_1]>$ and $|(c\bar{b})_{\bf 1}[^3P_J]>$ (with $J=(1,2,3)$). More over, we also calculate the channel with the two color-octet quarkonium states $|(c\bar{b})_{\bf 8}[^1S_0]g>$ and $|(c\bar{b})_{\bf 8}[^3S_1]g>$, 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 $B_c$ production, whose decay width is about 20% of the total decay width $\Gamma_{Z^0\to B_c}$. After summing up all the mentioned $(c\bar{b})$-quarkonium states' contributions, we obtain $\Gamma_{Z^0\to B_c} =235.9^{+352.8}_{-122.0}$ KeV, where the errors are caused by the main uncertainty sources.

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