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arXiv 1809.03573hep-phnucl-exnucl-th
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CGC + NRQCD方法中的$J/ψ$极化

$J/ψ$ polarization in the CGC+NRQCD approach

Yan-Qing Ma, Tomasz Stebel, Raju Venugopalan

摘要:

我们计算$J/ψ$偏振观测$λ_θ$,$λ_ϕ$,$λ_{θϕ}$在一个彩色玻璃凝聚(CGC)+非相对论QCQ(NRQCD)形式主义,其中包括颜色单重态和颜色八重态中间态的贡献。我们的研究结果进行了比较低$p_T$数据$J/ψ$极化从LHCb和ALICE实验质子-质子碰撞的质量中心能量的$\sqrt{s}=7$ TeV和8 TeV。我们的CGC+NRQCD计算提供了一个更好的描述$p_T \leq 15$ GeV的数据相对于现有的下一个领先(NLO)计算内的共线因式分解框架。这些结果表明,在CGC+NRQCD框架下的高阶计算有可能大大提高NRQCD普适长距离矩阵元提取值的精度。

英文摘要:

We compute the $J/ψ$ polarization observables $λ_θ$, $λ_ϕ$, $λ_{θϕ}$ in a Color Glass Condensate (CGC) + nonrelativistic QCQ (NRQCD) formalism that includes contributions from both color singlet and color octet intermediate states. Our results are compared to low $p_T$ data on $J/ψ$ polarization from the LHCb and ALICE experiments on proton-proton collisions at center-of-mass energies of $\sqrt{s}=7$ TeV and 8 TeV. Our CGC+NRQCD computation provides a better description of data for $p_T \leq 15$ GeV relative to extant next-to-leading (NLO) calculations within the collinear factorization framework. These results suggest that higher order computations in the CGC+NRQCD framework have the potential to greatly improve the accuracy of extracted values of the NRQCD universal long distance matrix elements.

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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