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arXiv 1408.4075hep-phhep-exnucl-th
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对撞机能量质子-质子碰撞产生$J/ψ$的综合描述

Comprehensive description of $J/ψ$ production in proton-proton collisions at collider energies

Yan-Qing Ma, Raju Venugopalan

摘要:

我们采用一个小的$x$彩色玻璃凝聚(CGC)+非相对论QCD(NRQCD)方法计算了对撞机能量下质子-质子碰撞中低$p_\perp$下的$J/ψ$产生.对于总截面、快度分布和低动量$p_\perp$分布,得到了很好的一致性。$ψ^\prime$生产也获得了类似的一致性。我们在$p_\perp$中观察到一个重叠区域,在那里我们的结果与在次领先阶(NLO)共线分解的NRQCD形式主义中得到的结果相匹配。在CGC+NRQCD框架中可以量化颜色单重态和颜色八重态贡献的相对贡献,其中前者贡献了总截面的大约$10\%$。

英文摘要:

We employ a small $x$ Color Glass Condensate (CGC)+ Non-Relativistic QCD (NRQCD) formalism to compute $J/ψ$ production at low $p_\perp$ in proton-proton collisions at collider energies. Very good agreement is obtained for total cross-sections, rapidity distributions and low momentum $p_\perp$ distributions. Similar agreement is obtained for $ψ^\prime$ production. We observe an overlap region in $p_\perp$ where our results match smoothly to those obtained in a next-to-leading order (NLO) collinearly factorized NRQCD formalism. The relative contribution of color singlet and color octet contributions can be quantified in the CGC+NRQCD framework, with the former contributing approximately $10\%$ of the total cross-section.

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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