arXiv 2001.064882020-01hep-ph

用部分子分支方法计算次主导阶低质量Drell-Yan产生的横动量谱

The transverse momentum spectrum of low mass Drell-Yan production at next-to-leading order in the parton branching method

A. Bermudez Martinez, P. L. S. Connor, D. Dominguez Damiani, L. I. Estevez Banos, F. Hautmann, H. Jung, J. Lidrych, A. Lelek, M. Mendizabal, M. Schmitz, S. Tahe… 展开作者

A. Bermudez Martinez, P. L. S. Connor, D. Dominguez Damiani, L. I. Estevez Banos, F. Hautmann, H. Jung, J. Lidrych, A. Lelek, M. Mendizabal, M. Schmitz, S. Taheri Monfared, Q. Wang, T. Wening, H. Yang, R. Zlebcik

备注：: v2: references, clarifications and discussion added; results unchanged Version to appear in EPJC

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摘要：

在文献中已经观察到，在低质心能量$\sqrt{s}$下低质量Drell-Yan（DY）横动量谱的测量，在横动量与DY质量相当的区域，用微扰QCD计算在共线因子分解中不能很好地描述。我们从部分子分支（PB）方法的角度研究这个问题，结合下一个领导阶（NLO）计算的硬过程与横向动量相关（TMD）部分子分布的演变。在低DY质量下，我们将我们的预测与实验测量进行了比较，发现两者吻合得很好.此外，我们还利用低$\sqrt{s}$下的低质量DY测量值确定了低演化尺度下PB-TMD的本征高斯分布宽度$q_s$.我们发现的值接近什么早些时候已被用于在大型强子对撞机（LHC）和HERA的应用程序的PB -TMD的高能过程。我们发现，在低DY质量和低$\sqrt{s}$时，即使在$p_t/m_{DY} \sim 1$区域，多重软胶子辐射（包含在PB-TMD中）的贡献对描述大气运动也是必不可少的，而在较大质量（$m_{DY} \sim m_{Z}$）和LHC能量时，软胶子在$p_t/m_{DY}\sim 1$区域的贡献很小.

英文摘要：

It has been observed in the literature that measurements of low-mass Drell-Yan (DY) transverse momentum spectra at low center-of-mass energies $\sqrt{s}$ are not well described by perturbative QCD calculations in collinear factorization in the region where transverse momenta are comparable with the DY mass. We examine this issue from the standpoint of the Parton Branching (PB) method, combining next-to-leading-order (NLO) calculations of the hard process with the evolution of transverse momentum dependent (TMD) parton distributions. We compare our predictions with experimental measurements at low DY mass, and find very good agreement.In addition we use the low mass DY measurements at low $\sqrt{s}$ to determine the width $q_s$ of the intrinsic Gauss distribution of the PB-TMDs at low evolution scales. We find values close to what has earlier been used in applications of PB -TMDs to high-energy processes at the Large Hadron Collider (LHC) and HERA. We find that at low DY mass and low $\sqrt{s}$ even in the region of $p_t/m_{DY} \sim 1$ the contribution of multiple soft gluon emissions (included in the PB-TMDs) is essential to describe themeasurements, while at larger masses ($m_{DY} \sim m_{Z}$) and LHC energies the contribution from soft gluons in the region of $p_t/m_{DY}\sim 1$ is small.

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