High E() inclusive jet cross-sections in photoproduction at HERA
Feb, 199824 pages
Published in:
- Eur.Phys.J.C 4 (1998) 591-606
e-Print:
- hep-ex/9802012 [hep-ex]
Report number:
- DESY-98-018,
- ANL-HEP-PR-98-25
Experiments:
Citations per year
Abstract:
Inclusive jet differential cross sections for the reaction e+ p --> e+ + jet + X with quasi-real photons have been measured with the ZEUS detector at HERA. These cross sections are given for the photon-proton centre-of-mass energy interval 134 < W < 277 GeV and jet pseudorapidity in the range -1 < eta(jet) < 2 in the laboratory frame. The results are presented for three cone radii in the eta-phi plane, R=1.0, 0.7 and 0.5. Measurements of dsigma/deta(jet) above various jet-transverse-energy thresholds up to 25 GeV and in three ranges of W are presented and compared to next-to-leading order (NLO) QCD calculations. For jets defined with R=1.0 differences between data and NLO calculations are seen at high eta(jet) and low E_T(jet). The measured cross sections for jets defined with R=0.7 are well described by the calculations in the entire measured range of eta(jet) and E_T(jet). The inclusive jet cross section for E_T(jet) > 21 GeV is consistent with an approximately linear variation with the cone radius R in the range between 0.5 and 1.0, and with NLO calculations.Note:
- 31 pages including 8 figures Report-no: DESY-98-018
- positron p: colliding beams
- positron p: inclusive reaction
- jet: photoproduction
- differential cross section: rapidity dependence
- jet: transverse energy
- quantum chromodynamics: perturbation theory
- jet: particle identification
- ZEUS
- experimental results
- DESY HERA Stor
References(65)
Figures(9)