High-E{sub T} inclusive jet cross sections in photoproduction at HERA.

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Eur. Phys. J. C

OSTI ID:938303

Derrick, M

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}{sup jet} < 2 in the laboratory frame. The results are presented for three cone radii in the {eta} -rphi plane, R=1.0, 0.7and 0.5. Measurements of d{sigma} /d{eta} 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{sub 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 ? jet and ETjet. The inclusive jet cross section for ETjet>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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: ER
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 938303
• Report Number(s): ANL-HEP-PR-98-25
• Journal Information: Eur. Phys. J. C, Journal Name: Eur. Phys. J. C Journal Issue: 1998 Vol. 2
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
PHOTONS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS