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arXiv 1902.09336hep-phhep-ex
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LHC上$t$通道单顶夸克产生中的软胶子恢复

Soft Gluon Resummation in $t$-channel single top quark production at the LHC

Qing-Hong Cao, Peng Sun, Bin Yan, C. -P. Yuan, Feng Yuan

摘要:

本文对大型强子对撞机(LHC)上$t$通道单顶夸克和反顶夸克产生过程中的多重软胶子辐射进行了详细的唯象研究。应用横向动量相关因式分解方法,将单顶(反顶)加单喷流末态系统的小总横向动量$q_\perp$引入的大扰动在强相互作用耦合展开式中以次领先对数的精度表示到各阶.我们讨论了对这种效应敏感的各种运动学分布,发现当末态喷流要求在前区时,软胶子辐射变得更加重要。我们表明,从PYTHIA预测的主要区别在于列入我们的重新计算中的初始和最终状态之间的确切的颜色相干效应。我们进一步提出了应用实验可观测$ϕ^*$来检验多胶子辐射在单顶和反顶事件中的作用。还讨论了底夸克质量效应和喷流快度分布。

英文摘要:

We present a detailed phenomenological study of the multiple soft gluon radiation for the $t$-channel single top and anti-top quark production at the Large Hadron Collider (LHC). By applying the transverse momentum dependent factorization formalism, large logarithms introduced by small total transverse momentum $q_\perp$ of the single-top (anti-top) plus one-jet final state system are resummed to all orders in the expansion of the strong interaction coupling at the accuracy of Next-to-Leading Logarithm. We discuss various kinematical distributions which are sensitive to this effect and find that soft gluon radiation become more important when the final state jet is required to be in the forward region. We show that the main difference from PYTHIA prediction lies on the inclusion of the exact color coherence effect between the initial and final states in our resummation calculation. We further propose to apply the experimental observable $ϕ^*$ to test the effect of multiple gluon radiation in the single-top and anti-top events. The bottom quark mass effect and jet rapidity distribution are also discussed.

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。

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