Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector - INSPIRE

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Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

ATLAS

Collaboration

Mar, 2012

34 pages

Published in:

Phys.Rev.D 85 (2012) 092014

e-Print:

1203.3161 [hep-ex]

DOI:

10.1103/PhysRevD.85.092014

Report number:

CERN-PH-EP-2012-009

Experiments:

CERN-LHC-ATLAS

View in:

reference search91 citations

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Abstract: (arXiv)

A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy

\sqrt{s}

= 7 TeV is presented. Photons are reconstructed in the pseudorapidity range

|\eta^{\gamma}| \lt 1.37

and with a transverse energy

E_T^\gamma

> 25 GeV. Jets are reconstructed in the rapidity range

|y^{jet}|

< 4.4 and with a transverse momentum

p_T^{jet}

> 20 GeV. The differential cross section

d\sigma/dE_T^\gamma

is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-

p_T

jet:

|y^{jet}| < 1.2, 1.2 \le |y^{jet}|

< 2.8 and 2.8

\le |y^{jet}|

< 4.4. For each rapidity configuration the same-sign

(\eta^{\gamma}y^{jet}\ge 0)

and opposite-sign

(\eta^{\gamma}y^{jet}<0)

cases are studied separately. The results are based on an integrated luminosity of 37 pb

^{-1}

, collected with the ATLAS detector at the LHC. Next-to-leading order perturbative QCD calculations are found to be in fair agreement with the data, except for

E_T^{\gamma} \lt 45

GeV, where the theoretical predictions overestimate the measured cross sections.

Note:

21 pages plus author list (34 pages total), 3 figures, 22 tables, version published in Physical Review D

13.85.Qk
12.38.Qk
p p: interaction
photon: isolated production
jet: associated production
photon: transverse energy
differential cross section: transverse energy: measured
rapidity dependence
angular correlation: (jet photon)
quantum chromodynamics: perturbation theory

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