Study of noncollinear parton dynamics in the prompt photon photoproduction at HERA

Journal Article · Sat May 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.094027· OSTI ID:21409950

Lipatov, A V; Zotov, N P ^[1]

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1. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow (Russian Federation)

We investigate the prompt photon photoproduction at HERA within the framework of the k{sub T}-factorization QCD approach. Our consideration is based on the off-shell matrix elements for the underlying partonic subprocesses. The unintegrated parton densities in a proton and in a photon are determined using the Kimber-Martin-Ryskin prescription. Additionally, we use the Ciafaloni-Catani-Fiorani-Marchesini-evolved unintegrated gluon as well as valence and sea quark distributions in a proton. A conservative error analysis is performed. Both inclusive and associated with the hadronic jet production rates are investigated. The theoretical results are compared with the recent experimental data taken by the H1 and ZEUS Collaborations. We study also the specific kinematical properties of the photon-jet system which are strongly sensitive to the transverse momentum of incoming partons. Using the Kimber-Martin-Ryskin scheme, the contribution from the quarks emerging from the earlier steps of the parton evolution is estimated and found to be of 15%-20% approximately.

• OSTI ID: 21409950
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BASIC INTERACTIONS
BOSONS
DENSITY
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FACTORIZATION
FERMIONS
FIELD THEORIES
GLUONS
HADRONS
HERA STORAGE RING
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATRIX ELEMENTS
MEASURING INSTRUMENTS
MULTIPARTICLE SPECTROMETERS
NUCLEONS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PHOTOPRODUCTION
PHYSICAL PROPERTIES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SPECTROMETERS
STORAGE RINGS
TRANSVERSE MOMENTUM