Measurement of photon production in proton-proton collisions at √s=13 TeV with the ATLAS detector

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作者：
Cantero, Josu [1 ]
机构：
[1] Oklahoma State Univ, Stillwater, OK 74078 USA
来源：
EUROPEAN PHYSICAL SOCIETY CONFERENCE ON HIGH ENERGY PHYSICS, EPS-HEP2019 | 2020年
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中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
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摘要：
The production of prompt photons in proton-proton collisions at the LHC provides a testing ground for perturbative QCD with a hard colourless probe. Since the dominant production mechanism in proton-proton collisions proceeds via the qg -> g gamma process, measurements of prompt-photon and photon plus jet production are sensitive at leading order to the gluon density in the proton. This contribution presents the latest ATLAS measurements of the ratio of the cross sections for inclusive isolated-photon production at centre-of-mass energies of 13 and 8 TeV, the measurements of isolated-photon plus jet cross sections at root s = 13 TeV using a dataset with an integrated luminosity of 3.2 fb(-1) and the differential cross section for isolated-photon production measured at root s = 13 TeV using an integrated luminosity of 36.1 fb(-1). The measurements are compared to next-to-leading-order QCD as well as to next-to-next-to-leading-order QCD calculations.
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