Diffractive Dijet Photoproduction in ep Collisions at HERA
201035 pages
Published in:
- Eur.Phys.J.C 70 (2010) 15-37
e-Print:
- 1006.0946 [hep-ex]
Report number:
- DESY-10-043,
- DESY10-043
Experiments:
Citations per year
Abstract: (arXiv)
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 x_gamma 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.Note:
- 34 pages, 9 figures, 6 tables
- jet: pair production
- higher-order: 1
- parton: showers
- rapidity: gap
- positron p: deep inelastic scattering
- positron p: inclusive reaction
- positron: photoproduction
- diffraction
- Monte Carlo
- quantum chromodynamics: perturbation theory
References(69)
Figures(10)