Single photon production at hadron colliders at NNLO QCD with realistic photon isolation

被引：12
作者：
Chen, X. [1 ,2 ]
Gehrmann, T. [3 ]
Glover, E. W. N. [4 ]
Hoefer, M. [5 ]
Huss, A. [6 ]
Schuermann, R. [3 ]
机构：
[1] Karlsruhe Inst Technol, Inst Theoret Phys, D-76131 Karlsruhe, Germany
[2] Karlsruhe Inst Technol, Inst Astroparticle Phys, D-76344 Eggenstein Leopoldshafen, Germany
[3] Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland
[4] Univ Durham, Inst Particle Phys Phenomenol, Dept Phys, Durham DH1 3LE, England
[5] Ludwig Maximilians Univ Munchen, Fak Phys, Arnold Sommerfeld Ctr Theoret Phys, D-80333 Munich, Germany
[6] CERN, Theoret Phys Dept, CH-1211 Geneva 23, Switzerland
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 2022卷 / 08期
基金：
瑞士国家科学基金会; 英国科学技术设施理事会; 欧洲研究理事会;
关键词：
Higher-Order Perturbative Calculations; Specific QCD Phenomenology; ONE-LOOP CORRECTIONS; FRAGMENTATION FUNCTION; TRANSVERSE-MOMENTUM; GLUON DISTRIBUTION; CONSTRAINTS; AMPLITUDES; PROTON; QUARK; REAL;
D O I：
10.1007/JHEP08(2022)094
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：
Isolated photons at hadron colliders are defined by permitting only a limited amount of hadronic energy inside a fixed-size cone around the candidate photon direction. This isolation criterion admits contributions from collinear photon radiation off QCD partons and from parton-to-photon fragmentation processes. We compute the NNLO QCD corrections to isolated photon and photon-plus-jet production, including these two contributions. Our newly derived results allow us to reproduce the isolation prescription used in the experimental measurements, performing detailed comparisons with data from the LHC experiments. We quantify the impact of different photon isolation prescriptions, including no isolation at all, on photon-plus-jet cross sections and discuss possible measurements of the photon fragmentation functions at hadron colliders.
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收藏
页数：43
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