Relative contributions of fusion and fragmentation mechanisms in J/{psi} photoproduction at high energy

Journal Article · Thu Feb 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.034012· OSTI ID:21010988

Saleev, V A; Shipilova, A V ^[1]

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1. II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)

We study J/{psi} photoproduction via the fusion and fragmentation mechanisms at the HERA Collider within the frameworks of the collinear parton model and the quasi-multi-Regge kinematics approach using the factorization formalism of nonrelativistic QCD at leading order in the strong coupling constant {alpha}{sub s} and the relative velocity v of the bound quarks. It is shown that the fusion production mechanism dominates over the fragmentation production mechanism at the all relevant J/{psi} transverse momenta. The J/{psi} meson p{sub T} spectra in the fragmentation and fusion production at the asymptotilally large p{sub T} have equal slopes in the quasi-multi-Regge kinematics approach, opposite the collinear parton model.

• OSTI ID: 21010988
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
FACTORIZATION
GLUON MODEL
HERA STORAGE RING
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
QUARK MODEL
QUARKS
STRONG-COUPLING MODEL
TRANSVERSE MOMENTUM