动态梳理满足LHC数据
Dynamical grooming meets LHC data
摘要：
本文分析了强子碰撞中动力学疏导过程所标记的分裂的动量共享分数$z_g$、张开角$θ_g$和相对横动量$k_{t,g}$的全阶重构结构。我们证明了它们的重算是非指数的，并且没有聚类算法。然后，我们分析计算的概率分布（$z_g$，$θ_g$，$k_{t,g}$）的下一个到下一个到双对数精度（N2 DL）在窄喷流限制，包括匹配到领先的顺序在$α_s$。在现象学方面，我们进行了分析，部分子水平的比较与Pythia和Herwig。我们发现，分析和蒙特卡罗结果之间的差异主要是由红外调节器的部分子簇射。此外，我们提出了初步ALICE数据的第一个分析比较，并强调在这种低$p_t$制度的非微扰修正的作用。一旦分析结果是由现象学确定的非微扰因子校正，我们发现非常好的协议与数据。
英文摘要：
In this work, we analyse the all-orders resummation structure of the momentum sharing fraction, $z_g$, opening angle, $θ_g$, and relative transverse momentum, $k_{t,g}$, of the splitting tagged by the dynamical grooming procedure in hadronic collisions. We demonstrate that their resummation does non-exponentiate and it is free of clustering logarithms. Then, we analytically compute the probability distributions of ($z_g$, $θ_g$, $k_{t,g}$) up to next-to next-to-double logarithm accuracy (N2DL) in the narrow jet limit, including a matching to leading order in $α_s$. On the phenomenological side, we perform an analytic-to-parton level comparison with Pythia and Herwig. We find that differences between the analytic and the Monte-Carlo results are dominated by the infra-red regulator of the parton shower. Further, we present the first analytic comparison to preliminary ALICE data and highlight the role of non-perturbative corrections in such low-$p_t$ regime. Once the analytic result is corrected by a phenomenologically determined non-perturbative factor, we find very good agreement with the data.
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