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arXiv 1701.08730hep-ph
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LHC正向Drell-Yan产生的核修正

Nuclear modification of forward Drell-Yan production at the LHC

B. Ducloué

摘要:

在高能量下的前向Drell-Yan产生可以在小的$x$下,在饱和区对胶子密度提供重要的约束。在这项工作中,我们专注于这个过程的核修改,这可以在不久的将来在LHC测量。为此,我们采用色偶极的方法,使用光学Glauber模型的偶极截面的一个核的质子。结合这些结果与我们以前的结果向前$J/ψ$生产,我们计算这两个过程的核修饰因子的比例。这个观测最近被建议作为区分前向粒子产生中的初始和最终状态效应的一种方法。

英文摘要:

Forward Drell-Yan production at high energy can provide important constraints on gluon densities at small $x$, in the saturation regime. In this work we focus on the nuclear modification of this process, which could be measured at the LHC in the near future. For this we employ the color dipole approach, using the optical Glauber model to relate the dipole cross section of a nucleus to the one of a proton. Combining these results with our earlier results for forward $J/ψ$ production, we compute the ratio of the nuclear modification factors of these two processes. This observable was recently suggested as a way to distinguish between initial and final state effects in forward particle production.

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