Photon pair production in gluon fusion: top quark effects at NLO with threshold matching

被引：9

作者：

Chen, Long ^{[1
]}

Heinrich, Gudrun ^{[1
]}

Jahn, Stephan ^{[1
]}

Jones, Stephen P. ^{[2
]}

Kerner, Matthias ^{[3
]}

Schlenk, Johannes ^{[4
]}

Yokoya, Hiroshi ^{[5
]}

机构：

[1] Max Planck Inst Phys & Astrophys, Fohringer Ring 6, D-80805 Munich, Germany

[2] CERN, Theoret Phys Dept, Geneva, Switzerland

[3] Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[4] Paul Scherrer Inst, Theory Grp LTP, CH-5232 Villigen, Switzerland

[5] KIAS, Quantum Universe Ctr, Seoul 02455, South Korea

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 04期

基金：

瑞士国家科学基金会;

关键词：

NLO Computations; QCD Phenomenology; NEAR-THRESHOLD; HEAVY; QCD; DECAYS; LIGHT; ORDER;

D O I：

10.1007/JHEP04(2020)115

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 present a calculation of the NLO QCD corrections to the loop-induced production of a photon pair through gluon fusion, including massive top quarks at two loops, where the two-loop integrals are calculated numerically. Matching the fixed-order NLO results to a threshold expansion, we obtain accurate results around the top quark pair production threshold. We analyse how the top quark threshold corrections affect distributions of the photon pair invariant mass and comment on the possibility of determining the top quark mass from precision measurements of the diphoton invariant mass spectrum.

引用

页数：23

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