Two-loop helicity amplitudes for gg → ZZ with full top-quark mass effects

被引：27

作者：

Agarwal, Bakul ^{[1
]}

Jones, Stephen P. ^{[2
,3
]}

von Manteuffel, Andreas ^{[1
]}

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

[3] CERN, Theoret Phys Dept, CH-1211 Geneva 23, Switzerland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 05期

基金：

美国国家科学基金会;

关键词：

NLO Computations; QCD Phenomenology; DIFFERENTIAL-EQUATIONS; NUMERICAL EVALUATION; FEYNMAN-INTEGRALS; PARTS; COMPUTATION; ALGORITHM; DIAGRAM;

D O I：

10.1007/JHEP05(2021)256

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We calculate the two-loop QCD corrections to gg -> ZZ involving a closed top-quark loop. We present a new method to systematically construct linear combinations of Feynman integrals with a convergent parametric representation, where we also allow for irreducible numerators, higher powers of propagators, dimensionally shifted integrals, and subsector integrals. The amplitude is expressed in terms of such finite integrals by employing syzygies derived with linear algebra and finite field techniques. Evaluating the amplitude using numerical integration, we find agreement with previous expansions in asymptotic limits and provide ab initio results also for intermediate partonic energies and non-central scattering at higher energies.

引用

页数：40

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