Hard diffraction at DESY HERA and the gluonic content of the Pomeron

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.2309· OSTI ID:279517

Capella, A; Kaidalov, A; Merino, C; Pertermann, D; Tran Thanh Van, J ^[1]

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1. Laboratoire de Physique Theorique et Hautes Energies, Batiment 211, Universite de Paris-Sud, 91405 Orsay Cedex (France)

We show that the previously introduced CKMT model, based on conventional Regge theory, gives a good description of the data from DESY HERA on the structure function {ital F}{sup {ital D}}{sub 2} for large rapidity gap (diffractive) events. These data allow us not only to determine the valence and sea quark content of the Pomeron, but also, through their {ital Q}{sup 2} dependence, give us information on its gluonic content. Using DGLAP evolution, we find that the gluon distribution in the Pomeron is very hard and the gluons carry more momentum than the quarks. This indicates that the Pomeron, unlike ordinary hadrons, is a mostly gluonic object. With our definition of the Pomeron flux factor the total momentum carried by quarks and gluons turns out to be 0.3{endash}0.4, strongly violating the momentum sum rule. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279517
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 53; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIFFRACTION
DISTRIBUTION
GLUONS
MOMENTUM TRANSFER
PARTICLE RAPIDITY
POMERANCHUK PARTICLES
QUARKS
REGGE CALCULUS
STRUCTURE FUNCTIONS