Drell-Yan lepton angular distributions in perturbative QCD
Drell-Yan lepton angular distributions in perturbative QCD
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DOI：
10.1103/physrevd.93.114013
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发表时间：
2016-05
影响因子：
5
通讯作者：
Martin Lambertsen;W. Vogelsang
中科院分区：
文献类型：
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作者：
Martin Lambertsen;W. Vogelsang
我们提出了一个全面的比较现有的实验数据的Drell-Yan轻子角系数$\ensuremath{\lambda}$和$\ensuremath{\nu}$的计算在领先和次领先的顺序微扰QCD。为了获得下一个领先的顺序修正，我们利用公开的数字代码，使我们能够计算的Drell-Yan截面在二阶微扰理论和我们需要的贡献，可以从中提取。我们的比较表明，微扰QCD是能够描述的实验数据总体上相当不错，特别是在对撞机，但也在固定的目标制度。在角度系数的基础上，似乎很少（如果有的话）有令人信服的证据，效果超出了固定阶共线因式分解微扰理论，虽然存在这样的影响是不排除的。
We present a comprehensive comparison of the available experimental data for the Drell-Yan lepton angular coefficients $\ensuremath{\lambda}$ and $\ensuremath{\nu}$ to calculations at leading and next-to-leading order of perturbative QCD. To obtain the next-to-leading order corrections, we make use of publicly available numerical codes that allow us to compute the Drell-Yan cross section at second order in perturbation theory and from which the contributions we need can be extracted. Our comparisons reveal that perturbative QCD is able to describe the experimental data overall rather well, especially at colliders, but also in the fixed-target regime. On the basis of the angular coefficients alone, there appears to be little (if any) convincing evidence for effects that go beyond fixed-order collinear factorized perturbation theory, although the presence of such effects is not ruled out.