Shadowing in the nuclear photoabsorption above the resonance region

Abstract

A model based on the hadronic fluctuations of the real photon is developed to describe the total photonucleon and photonuclear cross sections in the energy region above the nucleon resonances. The hadronic spectral function of the photon is derived including the finite width of vector-meson resonances and the quark-antiquark continuum. The shadowing effect is evaluated considering the effective interaction of the hadronic component with the bound nucleons within a Glauber-Gribov multiple scattering theory. The low energy onset of the shadowing effect is interpreted as a possible signature of a modification of the hadronic spectral function in the nuclear medium. A decrease of the $\rho$-meson mass in nuclei is suggested for a better explanation of the experimental data.

arXiv comment8 pages, 7 figures

References in corpus (10)

• Total cross sections
• Current correlation functions, QCD sum rules and vector mesons in baryonic matter
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Variation of hadron masses in finite nuclei
• Phenomenology of Nuclear Shadowing in Deep-Inelastic Scattering
• Rho-meson mass in light nuclei
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• Nuclear shadowing and rho photoproduction
• $\rho$-mass Modification in $H{e}^3$ - a Signal of Restoration of Chiral Symmetry or Test for Nuclear Matter Models ?

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• In-Medium rho^0 Spectral Function Study via the 2H, 3He, 12C(gamma,pi+pi-) Reaction
• Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV
• Evaluation of the total photoabsorption cross sections for actinides from photofission data and model calculations
• Low energy onset of nuclear shadowing in photoabsorption
• Total Hadron-Hadron Cross Sections at High Energies
• In-Medium Properties of Hadrons - Observables II
• Shadowing in the low energy photonuclear reaction
• Shadowing in photo-production : role of in-medium hadrons
• Experimental Review of Baryons in the Nuclear Medium
• $\rho$ - nucleus bound states in Walecka model
• Role of in-medium hadrons in photon-nucleus reactions : shadowing and dilepton spectrum