Cross section fluctuations of a photon projectile in the generalized vector meson dominance model

Journal Article · Sun Nov 01 04:00:00 EST 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.58.094039· OSTI ID:662353

Frankfurt, L ^[1]; Guzey, V ^[2]; Strikman, M ^[2]

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1. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, 69978 Tel Aviv (Israel)
2. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)

We explain that the generalized vector meson dominance (GVMD) models successful in the theoretical description of photoproduction and electroproduction in high energy processes effectively implement color coherent phenomena expected in QCD. Within a model, which reproduces Bjorken scaling and nuclear shadowing for deep inelastic processes, we calculate P{sub {gamma}}({sigma},Q{sup 2}), the probability for a photon to interact with a target with the cross section {sigma}. We find that within the GVMD model the virtual photon has two main components: the {open_quotes}hard{close_quotes} one with a small cross section of the order of 1/Q{sup 2} and the high probability and the {open_quotes}soft{close_quotes} one with a typical hadronic cross section with the probability suppressed by the factor of 1/Q{sup 2}. Thus the GVDM model produces P{sub {gamma}}({sigma},Q{sup 2}) similar to that within the parton model and suggests the interplay between hard and soft QCD at Q{sup 2}{gt}1thinspGeV{sup 2}. We study the limit {sigma}{r_arrow}0 and show that P{sub {gamma}}({sigma},Q{sup 2}){proportional_to}1/{sigma} in both the GVMD model and QCD. Thus similarly to the parton model the GVMD model predicts the color transparency phenomenon. This is an indirect indication that Bjorken scaling, color transparency and shadowing in nuclei in DIS are closely related. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 662353
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 58; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DEEP INELASTIC SCATTERING
ELECTROPRODUCTION
PARTON MODEL
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
SCALING LAWS
VECTOR DOMINANCE MODEL