Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Measurement of prompt photon cross sections in photoproduction at HERA
AU - H1 Collaboration, The
AU - Henderson, Robert C. W.
AU - Sloan, Terry
N1 - Author list is partial - see original article for full author list.
PY - 2005/1
Y1 - 2005/1
N2 - Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the γp center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < Eγ T < 10 GeV and for associated jets with Ejet T > 4.5 GeV. They are measured differentially as a function of Eγ T,Ejet T , the pseudorapidities ηγ and ηjet and estimators of the momentum fractions xγ and xp of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented.
AB - Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the γp center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < Eγ T < 10 GeV and for associated jets with Ejet T > 4.5 GeV. They are measured differentially as a function of Eγ T,Ejet T , the pseudorapidities ηγ and ηjet and estimators of the momentum fractions xγ and xp of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented.
U2 - 10.1140/epjc/s2004-02085-x
DO - 10.1140/epjc/s2004-02085-x
M3 - Journal article
VL - 38
SP - 437
EP - 445
JO - European Physical Journal C: Particles and Fields
JF - European Physical Journal C: Particles and Fields
SN - 1434-6044
IS - 4
ER -