Diffractive Dijets in DIS and Photoproduction

Journal Article · Thu Oct 06 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2122084· OSTI ID:20726487

Mozer, Matthias U ^[1]

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1. Physikalisches Institut, Universitaet Heidelberg, Philosophenweg 12, 69120 Heidelberg (Germany)

The factorization of diffractive ep cross sections into a (perturbatively accessible) matrix element and a diffractive structure function was proven for the case of DIS by Collins in 1998. This factorization is not expected to hold for Photoproduction. Diffractive dijet production provides a valuable probe to testing factorization and characterize possible mechanisms of factorization breaking. Measurements of dijet cross-sections in DIS and photoproduction made with the H1 detector at the HERA accelerator are presented. Diffractive events were identified by a rapidity gap selection. The resulting differential cross sections are compared to QCD calculations in NLO, based on structure functions extracted from inclusive diffraction. The diffractive dijet cross sections in DIS agree well with the QCD predictions, supporting the QCD factorization for DIS. This is not the case for the diffractive dijet cross sections in photoproduction, which are significantly suppressed with respect to the expectations from QCD factorization.

• OSTI ID: 20726487
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 792; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEEP INELASTIC SCATTERING
DIFFRACTION MODELS
FACTORIZATION
HADRONS
HERA STORAGE RING
JET MODEL
MATRIX ELEMENTS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
STRUCTURE FUNCTIONS