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arXiv 1102.2443hep-ph
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强子对撞机产生重粒子的天线减法

Antenna subtraction for the production of heavy particles at hadron colliders

Gabriel Abelof, Aude Gehrmann-De Ridder

摘要:

天线减法最初开发用于计算从无色初始状态的喷射观测量的高阶修正的强子对撞机过程中,涉及一对大质量粒子和喷流在末态下的次领先阶(NLO)水平扩展。由于有色初始状态的存在,减法项需要分为三类(final-final,initial-final和initial-initial)。在本文中,我们概述了他们的建设,并得出必要的成分:相空间分解,天线功能,也集成天线,包括大规模的最终状态的影响,在所有这些建设部分。作为第一个应用程序,我们明确地构建了色序的实际辐射和相应的天线减法项所需的非线性光学生产的顶夸克对和生产的顶夸克对与硬喷。后者构成了一个重要的组成部分,计算强子生产的顶-反顶对在NNLO。

英文摘要:

The antenna subtraction method developed originally for the computation of higher order corrections to jet observables from a colourless initial state is extended for hadron collider processes involving a pair of massive particles and jets in the final state at the next-to-leading order (NLO) level. Due to the presence of coloured initial states, the subtraction terms need to be divided into three categories (final-final, initial-final and initial-initial). In this paper, we outline their construction and derive the necessary ingredients: phase space factorisation, antenna functions and also integrated antennae, including the effects of massive final states in all of those building parts. As a first application, we explicitly construct the colour-ordered real radiation and the corresponding antenna subtraction terms required at NLO for the production of a top quark pair and for the production of a top quark pair in association with a hard jet. The latter constitutes an essential ingredient for the computation of the hadronic production of a top-antitop pair at NNLO.

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