Hard Diffraction at HERA and the Gluonic Content of the Pomeron

Abstract

We show that the previously introduced CKMT model, based on conventional Regge theory, gives a good description of the HERA data on the structure function F_2^D for large rapidity gap (diffractive) events. These data allow, not only to determine the valence and sea quark content of the Pomeron, but also, through their Q^2 dependence, give 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 0.3-0.4 - strongly violating the momentum sum rule.

arXiv commentC-Shell archive of a PostScript file containing a 20 page paper with text and 12 figures in it

References in corpus (5)

• First Measurement of the Deep--Inelastic Structure of Proton Diffraction
• Structure functions and low x physics
• Hard diffraction in hadron--hadron interactions and in photoproduction
• Diffractive Dissociation in Deep Inelastic Scattering at HERA
• QCD Analysis of Deep Inelastic Diffractive Scattering at HERA

Cited by in corpus (13)

• The Monte Carlo Event Generator DPMJET-III
• Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• Behavior of Diffractive Parton Distribution Functions
• Diffractive Dijet Production in Deep Inelastic Scattering and Photon-Hadron Collisions in the Color Glass Condensate
• Large Rapidity Gap Events in Deep Inelastic Scattering
• Odderon-Pomeron Interference
• A unitary model for structure functions and diffractive production at small x
• Deep Inelastic Scattering Data and the Problem of Saturation in Small-x Physics
• Scaling Violations in the $Q^2$ Logarithmic Derivative of $F_2$
• The Hard and Soft Contributions in Diffraction: A Closer Look
• The Logarithmic Slope in Diffractive DIS
• Charm production in diffractive deep inelastic scattering
• Multiparticle production in small-x deep inelastic scattering and the nature of the Pomeron