INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at √s = 7 TeV with the ATLAS detector'
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICAL REVIEW D
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1550-7998
Resumen:
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)|<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 dsigma/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<=|y(jet)|<2.8 and 2.8<=|y(jet)|< 4.4. For each rapidity
configuration the same-sign (eta(gamma)y(jet)>=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)<~45 GeV, where the theoretical predictions overestimate
the measured cross sections.