{gamma}p and {gamma}{gamma} scattering from pp, pp forward amplitudes in a QCD eikonal model with a dynamical gluon mass

Journal Article · Sat Apr 01 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.73.074019· OSTI ID:20782815

Luna, E G.S. ^[1]; Natale, A A ^[1]

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1. Instituto de Fisica Teorica, UNESP, Sao Paulo State University, 01405-900, Sao Paulo, SP (Brazil)

We examine the {gamma}p photoproduction and the hadronic {gamma}{gamma} total cross sections by means of a QCD eikonal model with a dynamical infrared mass scale. In this model, where the dynamical gluon mass is the natural regulator for the tree level gluon-gluon scattering, the {gamma}p and {gamma}{gamma} total cross sections are derived from the pp and pp forward scattering amplitudes assuming vector meson dominance and the additive quark model. We show that the validity of the cross section factorization relation {sigma}{sub pp}/{sigma}{sub {gamma}}{sub p}={sigma}{sub {gamma}}{sub p}/{sigma}{sub {gamma}}{sub {gamma}} is fulfilled depending on the Monte Carlo model used to unfold the hadronic {gamma}{gamma} cross section data, and we discuss in detail the case of {sigma}({gamma}{gamma}{yields}hadrons) data with W{sub {gamma}}{sub {gamma}}>10 GeV unfolded by the Monte Carlo generators PYTHIA and PHOJET. The data seems to favor a mild dependence with the energy of the probability (P{sub had}) that the photon interacts as a hadron.

• OSTI ID: 20782815
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
EIKONAL APPROXIMATION
FACTORIZATION
GEV RANGE
GLUON-GLUON INTERACTIONS
GLUONS
MONTE CARLO METHOD
PHOTON-PHOTON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
PROBABILITY
QUANTUM CHROMODYNAMICS
QUARK MODEL
REST MASS
SCATTERING
SCATTERING AMPLITUDES
TOTAL CROSS SECTIONS
VECTOR MESONS