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arXiv 1905.07331hep-ph
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考虑初始部分子横动量的质子-铅碰撞在LHC的Z玻色子产生

Z boson production in proton-lead collisions at the LHC accounting for transverse momenta of initial partons

E. Blanco, A. van Hameren, H. Jung, A. Kusina, K. Kutak

摘要:

我们在考虑初始部分子横动量的情况下,计算了LHC质子-铅碰撞中包含的$Z$玻色子的产生。我们使用$k_T$ -因子分解的框架结合横向动量依赖部分子分布(TMD)与离壳矩阵元素。为了做到这一点,我们需要构建适当的TMD的铅核,这是使用部分子分支方法。我们的计算进行了比较,从CMS在$\sqrt{s}=5.02$ TeV的数据。计算结果与测量结果特别是$Z$玻色子的横动量分布符合得很好。

英文摘要:

We perform a calculation of inclusive $Z$ boson production in proton-lead collisions at the LHC taking into account the transverse momenta of the initial partons. We use the framework of $k_T$-factorization combining transverse momentum dependent parton distributions (TMDs) with off-shell matrix elements. In order to do it we need to construct appropriate TMDs for lead nuclei which is done using the parton branching method. Our computations are compared with data from CMS taken at $\sqrt{s}=5.02$ TeV. The results are in good agreement with the measurements especially the transverse momentum distribution of the $Z$ boson.

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