arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.13432hep-phhep-exnucl-th
收藏

在LHC区用色偶极方法计算核横动量不平衡

Nuclear transverse momentum imbalance in the color dipole approach at the LHC regime

F. G. Ben, A. V. Giannini, M. V. T. Machado

摘要:

用色偶极方法计算了部分子在大核中传播的横动量展宽,采用了不同的偶极截面模型或胶子分布模型,导致了系数$C_{\mathcal{F}}(0,s)$的不同值.数值计算相比,从LHCb和ALICE实验提取的数据为$J/ψ$的核增宽。我们发现,不同的模型描述的小$x$数据预测值的$Δp_T^2$,同意相当好的实验,特别是向前的速度。中心依赖性也进行了分析,模型是一致的ALICE测量。

英文摘要:

Transverse momentum broadening of a parton propagating through a large nucleus is evaluated in the color dipole approach using different models for the dipole cross section or unintegrated gluon distribution, which lead to different values of the coefficient $C_{\mathcal{F}}(0,s)$. Numerical calculations are compared to data extracted from LHCb and ALICE experiments for nuclear broadening of $J/ψ$. We find that different models which describe the small-$x$ data predict values of $Δp_T^2$ that agree reasonably well with experiment, specially for forward rapidity. The centrality dependence was also analysed and the models are consistent with the ALICE measurements.

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。

↑