arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2603.09646hep-ph
收藏

缪子产生在轻子-核碰撞中的次次次leading order in perturbative QCD

Dimuon production in neutrino-nucleus collisions at next-to-next-to-leading order in perturbative QCD

University of Jyväskylä(于韦斯屈莱大学);Helsinki Institute of Physics(赫尔辛基物理研究所)

Ilkka Helenius, Hannu Paukkunen, Sami Yrjänheikki

AI总结:

本文基于SIDIS模型,提出NNLO级perturbative QCD计算,以解决中微子-核碰撞中缪子产生与LHC数据之间的矛盾。

摘要:

charm产生在带电电流中微子-核深度非弹性散射(DIS)中,通过缪子最终状态测量,仍然是全球部分子分布函数(PDFs)分析中 strangeness 的重要约束。该过程传统上倾向于在小动量分数 x 处具有比 LHC 重规范玻色子数据所指示的更小的 strange-quark PDF。在这里,我们提出了一种基于半包容 DIS(SIDIS)的次次次leading order(NNLO)perturbative QCD 计算,用于中微子-核 DIS 中的缪子产生。该过程此前通过完全包容 charm 产生在 NNLO 被计算过。我们讨论了该方法的不足之处以及在 SIDIS 情况下如何解决这些问题。我们研究了 perturbative 收敛性,并探索了在 NNLO 可用的新重夸克产生通道。我们发现,NNLO 纠正显著减少了在大 x 值处的标度不确定性,其中截面被 NNLO 纠正增强。在小 x 处,NNLO 纠正倾向于为负,这缓解了缪子和 LHC 数据之间的张力。

英文摘要:

Charm production in charged-current neutrino-nucleus deep-inelastic scattering (DIS), measured through dimuon final states, remains an important constraint of strangeness in global analyses of parton distribution functions (PDFs). This process has traditionally favored a smaller strange-quark PDF at small momentum fractions $x$ than what the LHC heavy-gauge boson data have indicated. Here, we present a self-contained next-to-next-to-leading-order (NNLO) perturbative QCD calculation of dimuon production in neutrino-nucleus DIS based on semi-inclusive DIS (SIDIS). This process has been previously computed at NNLO through fully inclusive charm production. We discuss the shortcomings of this approach and how they are addressed in the SIDIS picture. We study the perturbative convergence and explore new heavy-quark production channels that become available at NNLO. We find that the NNLO corrections significantly reduce the scale uncertainties at large values of $x$ where the cross sections are enhanced by the NNLO corrections. At small $x$, the NNLO corrections tend to be negative instead, which alleviate the tension between the dimuon and LHC 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。

↑