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arXiv 0910.0220hep-ph
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$η_{b}$到$S$和$P$波粲偶素态的包含衰变

Inclusive decays of $η_{b}$ into $S$- and $P$-wave charmonium states

Zhi-Guo He, Bai-Qing Li

摘要:

采用NRQCD因子化方法,在强耦合常数$α_s$和夸克偶素内部相对速度$v$的引导阶下,计算了底偶素基态$η_b$衰变中包含的S波和P波粲偶素产生.我们发现$η_b \to χ_{c_J}+ g g$和$χ_{c_J} \to J/ψ+ γ$对$η_b$衰变过程中$J/ψ$产生的贡献也是非常重要的,这可能有助于研究LHCb和SuperB中$η_b$衰变过程中$J/ψ$产生的色八重态机制.作为补充,我们还研究了在$η_b$衰变过程中$η_c$和$χ_{cJ}$的包容产生,这有助于我们理解X(3940)和X(3872)态.

英文摘要:

Inclusive S- and P-wave charmonium productions in the bottomonium ground state $η_b$ decay are calculated at the leading order in the strong coupling constant $α_s$ and quarkonium internal relative velocity $v$ in the framework of the NRQCD factorization approach. We find the contribution of $η_b \to χ_{c_J}+ g g$ followed by $χ_{c_J} \to J/ψ+ γ$ is also very important to the inclusive $J/ψ$ production in the $η_b$ decays, which maybe helpful to the investigation of the color-octet mechanism in the inclusive $J/ψ$ production in the $η_b$ decays in the forthcoming LHCb and SuperB. As a complementary work, we also study the inclusive production of $η_c$, and $χ_{cJ}$ in the $η_b$ decays, which may help us understand the X(3940) and X(3872) states.

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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