Higher-order soft-gluon corrections for [formula omitted] cross sections

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2024-11-20 DOI:10.1016/j.physletb.2024.139146

Nikolaos Kidonakis, Chris Foster

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引用次数: 0

Abstract

We calculate higher-order soft-gluon corrections for the associated production of a top-antitop quark pair and a Z boson (tt¯Z production) in proton-proton collisions. We find that these corrections are numerically dominant and large. We present approximate NNLO (aNNLO) and approximate N3LO (aN3LO) cross sections that add, respectively, second-order and third-order soft-gluon corrections to the exact NLO QCD result. We also add electroweak (EW) corrections through NLO. We estimate uncertainties that arise from scale dependence, which are smaller at higher orders, and from parton distribution functions. We compare our aN3LO QCD + NLO EW theoretical results to measurements of tt¯Z cross sections from the LHC and find good agreement. We also calculate single-particle-inclusive differential distributions in top-quark transverse momentum and rapidity.

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公式省略]截面的高阶软胶子修正

我们计算了质子-质子对撞中顶-顶夸克对和 Z 玻色子的相关产生（tt¯Z 产生）的高阶软胶子修正。我们发现这些修正在数值上占主导地位，而且很大。我们提出了近似 NNLO（aNNLO）和近似 N3LO（aN3LO）截面，它们分别在精确 NLO QCD 结果的基础上增加了二阶和三阶软胶子修正。我们还通过 NLO 增加了电弱（EW）修正。我们估算了尺度依赖性和粒子分布函数引起的不确定性，尺度依赖性在高阶时较小。我们将 aN3LO QCD + NLO EW 理论结果与大型强子对撞机的 tt¯Z 截面测量结果进行比较，发现两者吻合得很好。我们还计算了顶夸克横动量和速度的单粒子包含差分分布。

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.