Diffractive dijet photoproduction in ep collisions at HERA

Link:
Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Production
  • Protons
  • Central exclusive
  • Decay
  • Quarks
  • Neutrinos
  • Production
  • Protons
  • Central exclusive
  • Decay
  • Quarks
  • Neutrinos
Beschreibung:
  • Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb-1. The events are of the type ep→eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant dependence on the fraction xγ of the photon four-momentum entering the hard subprocess. Ratios of the diffractive to the inclusive dijet cross sections are measured for the first time and are compared with Monte Carlo models. © 2010 The Author(s).
Lizenz:
  • info:eu-repo/semantics/openAccess
Quellsystem:
Forschungsinformationssystem der UHH
Interne Metadaten
Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/4c94e4ce-1f92-455a-8fd2-33e175f2ad3a