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arXiv 2202.01579hep-ph
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通过$W^+$玻色子衰变产生激发二重重子

Excited doubly heavy baryon production via $W^+$ boson decays

Peng-Hui Zhang, Lei Guo, Xu-Chang Zheng, Qi-Wei Ke

摘要:

本文在非相对论QCD(NRQCD)框架下,通过$W^+ \to Ξ_{cc}+ \bar{c}+\bar{s}$和$W^+ \to Ξ_{bc}+ \bar{b}+\bar{s}$,在全相空间理论计算了重子($Ξ_{cc} ~\text{and} ~Ξ_{bc}$)产生的衰变宽度。还给出了差分宽度$dΓ/ds_{12}$、$dΓ/ds_{23}$、$dΓ/dcosθ_{12}$和$dΓ/dcosθ_{13}$。除了重子的普通S波贡献外,我们还计算了中间双夸克的P波贡献,即高激发态,包括反三重态$\overline{\mathbf{3}}$和六重态$\mathbf{6}$的$[^1P_1]$和$[^3P_J]$(含$J=0,1,2$).结果表明,P波的贡献比S波低一个数量级左右。根据结果,我们可以预期LHC会产生大量的事件,即,每年的$3.69\times10^5$ $Ξ_{cc}$事件和$4.91\times10^4$ $Ξ_{bc}$事件。

英文摘要:

In this paper, decay widths of the doubly heavy baryons ($Ξ_{cc} ~\text{and} ~Ξ_{bc}$) production are theoritically calculated in the whole phase space through $W^+ \to Ξ_{cc}+ \bar{c}+\bar{s}$ and $W^+ \to Ξ_{bc}+ \bar{b}+\bar{s}$, within the framework of nonrelativistic QCD (NRQCD). Differential widths $dΓ/ds_{12}$, $dΓ/ds_{23}$, $dΓ/dcosθ_{12}$, and $dΓ/dcosθ_{13}$ are also given. In addition to the ordinary S wave contributions for the baryons, we specifically calculate P wave contributions as a comparison, namely the high excited states of the intermediate diquark, including $[^1P_1]$ and $[^3P_J]$ (with $J=0,1,2$) in both color anti-triplet state $\overline{\mathbf{3}}$ and color sextuplet state $\mathbf{6}$. It shows that the contribution from P wave is about one order lower than S wave. According to the results, we can expect plentiful events produced at the LHC, i.e., $3.69\times10^5$ $Ξ_{cc}$ events and $4.91\times10^4$ $Ξ_{bc}$ events per year.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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