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Diffractive Hard Photoproduction at HERA and Evidence for the Gluon Content of the Pomeron
- Source :
- Physics Letters B, 356 (1), Scopus-Elsevier, Physics Letters B, 356. Elsevier, University of Manchester-PURE
- Publication Year :
- 1995
-
Abstract
- Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction $ep \rightarrow jet \; + \; X$ with quasi-real photons have been measured with the ZEUS detector. The cross sections refer to jets with transverse energies $E_T^{jet}>8$~GeV. The data show the characteristics of a diffractive process mediated by pomeron exchange. Assuming that the events are due to the exchange of a pomeron with partonic structure, the quark and gluon content of the pomeron is probed at a scale $\sim (E_T^{jet})^2$. A comparison of the measurements with model predictions based on QCD plus Regge phenomenology requires a contribution of partons with a hard momentum density in the pomeron. A combined analysis of the jet cross sections and recent ZEUS measurements of the diffractive structure function in deep inelastic scattering gives the first experimental evidence for the gluon content of the pomeron in diffractive hard scattering processes. The data indicate that between 30\% and 80\% of the momentum of the pomeron carried by partons is due to hard gluons.<br />25 pages, latex, 4 figures appended as uuencoded file. No change w.r.t. previous version (just avoiding warning latex messages while processing)
- Subjects :
- Quark
Nuclear and High Energy Physics
Particle physics
LUND MONTE-CARLO
Regge phenomenology
PARTON DISTRIBUTIONS
QUARK INTERACTIONS
JET FRAGMENTATION
E+E-PHYSICS
SCATTERING
EVENTS
DISSOCIATION
CALORIMETER
ZEUS
FOS: Physical sciences
Parton
cross section measurement
pomeron exchange
deep inelastic scattering
01 natural sciences
7. Clean energy
High Energy Physics - Experiment
Nuclear physics
High Energy Physics - Experiment (hep-ex)
Pomeron
0103 physical sciences
Rapidity
010306 general physics
Nuclear Experiment
Physics
Quantum chromodynamics
Research Groups and Centres\Physics\Low Temperature Physics
010308 nuclear & particles physics
Faculty of Science\Physics
High Energy Physics::Phenomenology
HERA
Deep inelastic scattering
Gluon
High Energy Physics::Experiment
Subjects
Details
- Language :
- English
- ISSN :
- 03702693
- Database :
- OpenAIRE
- Journal :
- Physics Letters B, 356 (1), Scopus-Elsevier, Physics Letters B, 356. Elsevier, University of Manchester-PURE
- Accession number :
- edsair.doi.dedup.....dc91a2380392f771c7ebf809c31e90b0