Measurement of inclusive prompt photon photoproduction at HERA.

Journal Article · Sat Jan 01 00:00:00 EST 2000 · Phys. Lett. B

DOI:https://doi.org/10.1016/S0370-2693(99)01450-1· OSTI ID:949536

Breitweg, J; Chekanov, S; Derrick, M; Krakauer, D; Magill, S; Musgrave, B; Pellegrino, A; Repond, J; Stanek, R; Yoshida, R

First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb-1. Cross sections are given as a function of the pseudorapidity and the transverse energy ({eta}{sup {gamma}}, E{sub T}{sup {gamma}}) of the photon, for E{sub T}{sup {gamma}}>5 GeV in the {gamma}p centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from Monte Carlo models having leading-logarithm parton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward {eta}{sup {gamma}} (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 949536
• Report Number(s): ANL/HEP/JA-41797; PYLBAJ; TRN: US201012%%324
• Journal Information: Phys. Lett. B, Vol. B, Issue 472 ; 2000; ISSN 0370-2693
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
ENERGY RANGE
LUMINOSITY
PHOTONS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
TRANSVERSE ENERGY