arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1007.2351hep-phhep-ex
收藏

强子碰撞中Drell-Yan轻子对的产生:次-次-领先对数精度的横动量重算

Production of Drell--Yan lepton pairs in hadron collisions: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy

G. Bozzi, S. Catani, G. Ferrera, D. de Florian, M. Grazzini

摘要:

本文研究了强子碰撞中产生的Drell-Yan轻子对的横动量分布。在小的q_T值下,我们将微扰增强的微扰QCD贡献求和到次-次-领先的对数精度。在q_T的中间值和大值时,我们一致地将重算与已知的次首阶微扰结果相结合。我们的计算中包括了α_S^2阶以下的所有微扰项,在q_T上积分后,再现了Drell-Yan全截面的已知次-次-首阶结果。我们显示和讨论的规模依赖的结果相对于低阶计算,估计相应的扰动不确定性的减少。我们提出了与Tevatron运行II数据的初步比较。

英文摘要:

We consider the transverse-momentum (q_T) distribution of Drell--Yan lepton pairs produced in hadron collisions. At small values of q_T, we resum the logarithmically-enhanced perturbative QCD contributions up to next-to-next-to-leading logarithmic accuracy. At intermediate and large values of q_T, we consistently combine resummation with the known next-to-leading order perturbative result. All perturbative terms up to order alpha_S^2 are included in our computation which, after integration over q_T, reproduces the known next-to-next-to-leading order result for the Drell--Yan total cross section. We show and discuss the reduction in the scale dependence of the results with respect to lower-order calculations, estimating the corresponding perturbative uncertainty. We present a preliminary comparison with Tevatron Run II data.

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。

↑