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arXiv 1801.09656hep-phhep-ex
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LHC上$t$通道单顶夸克产生的横动量恢复

Transverse Momentum Resummation for $t$-channel single top quark production at the LHC

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

摘要:

研究了多重软胶子辐射对LHC中$t$通道单顶夸克产生的运动学分布的影响。应用横向动量相关因子分解方法,将大质量(单顶加单喷流末态系统的大不变质量$Q$与小总横向动量$q_\perp$之比)在强相互作用耦合展开式中以次首对数的精度表示到所有阶,包括完全次首阶修正.我们表明,从PYTHIA预测的主要区别在于列入的初始和最终状态之间的确切的颜色相干性的影响,在我们的重新计算,这变得更加重要时,最终状态喷流需要在前进的区域。我们进一步提出了一个新的实验观测$ϕ^*$来检验多胶子辐射在单顶事件中的作用。最后讨论了底夸克质量的影响。

英文摘要:

We study the effect of multiple soft gluon radiation on the kinematical distributions of the $t$-channel single top quark production at the LHC. By applying the transverse momentum dependent factorization formalism, large logarithms (of the ratio of large invariant mass $Q$ and small total transverse momentum $q_\perp$ of the single-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, including the complete next-to-leading order corrections. 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, which becomes more important when the final state jet is required to be in the forward region. We further propose a new experimental observable $ϕ^*$ to test the effect of multiple gluon radiation in the single-top events. The effect of bottom quark mass is also discussed.

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