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arXiv 2104.06920hep-phhep-ex
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在LHC生产Z+喷流时的喷流角

Jet Angularities in Z+jet production at the LHC

Simone Caletti, Oleh Fedkevych, Simone Marzani, Daniel Reichelt, Steffen Schumann, Gregory Soyez, Vincent Theeuwes

摘要:

我们提出了一个现象学的角度测量的最高横向动量喷流在大型强子对撞机事件,具有关联生产的$Z$玻色子和一个或多个喷流的研究。特别是,我们研究了在有和没有SoftDrop修饰过程的情况下在喷射上测量的棱角分布。我们开始我们的分析,利用国家的最先进的Monte Carlo部分子淋浴模拟,我们定量评估的影响下一个领先的顺序(NLO)匹配和合并程序。然后,我们移动到解析重申,并到达一个全阶表达式,其特点是重申大规模的对数精度(NLL),并匹配到确切的NLO结果。我们的预测包括软排放在大角度的影响,作为一个权力的扩张,在射流半径,和非全球性的湍流。此外,以确保通常被称为NLL $'$准确性的方式执行到固定阶的匹配。我们的结果占现实的实验削减,可以很容易地比较即将到来的测量喷射角从大型强子对撞机合作。

英文摘要:

We present a phenomenological study of angularities measured on the highest transverse-momentum jet in LHC events that feature the associate production of a $Z$ boson and one or more jets. In particular, we study angularity distributions that are measured on jets with and without the SoftDrop grooming procedure. We begin our analysis exploiting state-of-the-art Monte Carlo parton shower simulations and we quantitatively assess the impact of next-to-leading order (NLO) matching and merging procedures. We then move to analytic resummation and arrive at an all-order expression that features the resummation of large logarithms at next-to-leading logarithmic accuracy (NLL) and is matched to the exact NLO result. Our predictions include the effect of soft emissions at large angles, treated as a power expansion in the jet radius, and non-global logarithms. Furthermore, matching to fixed-order is performed in such a way to ensure what is usually referred to as NLL$'$ accuracy. Our results account for realistic experimental cuts and can be easily compared to upcoming measurements of jet angularities from the LHC collaborations.

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