Measurement of the production cross section of pairs of isolated photons in $pp$ collisions at 13 TeV with the ATLAS detector - INSPIRE

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Measurement of the production cross section of pairs of isolated photons in $pp$ collisions at 13 TeV with the ATLAS detector

ATLAS

Collaboration

Jul 20, 2021

52 pages

Published in:

JHEP 11 (2021) 169

Published: Nov 22, 2021

e-Print:

2107.09330 [hep-ex]

DOI:

10.1007/JHEP11(2021)169

Report number:

CERN-EP-2021-105

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

A measurement of prompt photon-pair production in proton-proton collisions at

\sqrt{s}

= 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb

^{−1}

. Events with two photons in the well-instrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of

{p}_{\mathrm{T}{,}_{\gamma 1(2)}}

> 40 (30) GeV for the leading (sub-leading) photon. The differential cross sections as functions of several observables for the diphoton system are measured and compared with theoretical predictions from state-of-the-art Monte Carlo and fixed-order calculations. The QCD predictions from next-to-next-to-leading-order calculations and multi-leg merged calculations are able to describe the measured integrated and differential cross sections within uncertainties, whereas lower-order calculations show significant deviations, demonstrating that higher-order perturbative QCD corrections are crucial for this process. The resummed predictions with parton showers additionally provide an excellent description of the low transverse-momentum regime of the diphoton system.[graphic not available: see fulltext]

Note:

52 pages in total, author list starting page 36, 12 figures, 5 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-30/

Hadron-Hadron scattering (experiments)
photon production
proton-proton scattering
QCD
p p: scattering
p p: colliding beams
parton: showers
quantum chromodynamics: perturbation theory
quantum chromodynamics: correction
transverse momentum: low

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