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arXiv 1201.2675hep-phhep-ex
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强子对撞机上非相对论性QCD的J/psi极化

J/psi polarization at hadron colliders in nonrelativistic QCD

Kuang-Ta Chao, Yan-Qing Ma, Hua-Sheng Shao, Kai Wang, Yu-Jie Zhang

摘要:

利用非相对论QCD因子分解,我们给出了强子对撞机上$J/psi$产生过程中所有重要Fock态,即$^3S_1[1,8]$,$^1S_0[8]$,和$^3P_J[8]$的偏振态的一个完整的次领先级计算.我们发现$^3P_J[8]$通道贡献了一个正的纵向分量和一个负的横向分量。因此,$J/psi$偏振难题可以理解为$^3S_1[8]$和$^3P_J[8]$通道之间的横向分量抵消,这主要导致非偏振(甚至轻微纵向偏振)$J/psi$。这可能为长期存在的$J/psi$偏振难题提供一个可能的解决方案。预测$J/psi$极化在大型强子对撞机。

英文摘要:

With nonrelativistic QCD factorization, we present a full next-to-leading order computation of the polarization observable for $J/psi$ production at hadron colliders including all important Fock states, i.e. $^3S_1[1,8]$, $^1S_0[8]$, and $^3P_J[8]$. We find the $^3P_J[8]$ channel contributes a positive longitudinal component and a negative transverse component. So the $J/psi$ polarization puzzle may be understood as the transverse components canceling between $^3S_1[8]$ and $^3P_J[8]$ channels, which results in mainly the unpolarized (even slightly longitudinally polarized) $J/psi$. This may give a possible solution to the long-standing $J/psi$ polarization puzzle. Predictions for $J/psi$ polarization at the LHC are also presented.

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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