arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2005.10832hep-phhep-exnucl-exnucl-th
收藏

在未来电子-离子对撞机上探索$J/ψ$的产生机制

Exploring $J/ψ$ production mechanism at the future Electron-Ion Collider

Jian-Wei Qiu, Xiang-Peng Wang, Hongxi Xing

摘要:

我们建议利用未来电子离子对撞机(EIC)产生的$J/ψ$的横动量$p_T$分布来探讨高能碰撞中重夸克偶素的产生机制。我们将QCD和QED共线因式分解应用于高$p_T$下的$c\bar{c}$对的产生,并将非相对论QCD因式分解应用于该对到$J/ψ$的强子化。我们评估了强耦合下的$p_T$ -分布,发现电子-强子碰撞中$c\bar{c}$对的各种色自旋通道的产生率与强子-强子碰撞中的产生率有很大的不同,这为确定该对成为$J/ψ$的各种跃迁率提供了很强的鉴别力。我们预言电子-强子碰撞中产生的$J/ψ$可能是非极化的,是研究碰撞强子(或核)胶子分布的理想探针。我们发现$J/ψ$的产生是由色八隅体通道控制的,这为探索EIC大核中的胶子介质提供了一个很好的探针。

英文摘要:

We propose to use transverse momentum $p_T$ distribution of $J/ψ$ production at the future Electron Ion Collider (EIC) to explore the production mechanism of heavy quarkonia in high energy collisions. We apply QCD and QED collinear factorization to the production of a $c\bar{c}$ pair at high $p_T$, and non-relativistic QCD factorization to the hadronization of the pair to a $J/ψ$. We evaluate $J/ψ$ $p_T$-distribution at both leading and next-to-leading order in strong coupling, and show that production rates for various color-spin channels of a $c\bar{c}$ pair in electron-hadron collisions are very different from that in hadron-hadron collisions, which provides a strong discriminative power to determine various transition rates for the pair to become a $J/ψ$. We predict that the $J/ψ$ produced in electron-hadron collisions is likely unpolarized, and the production is an ideal probe for gluon distribution of colliding hadron (or nucleus). We find that the $J/ψ$ production is dominated by the color-octet channel, providing an excellent probe to explore the gluon medium in large nuclei at the EIC.

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。

↑