Nuclear shadowing at low photon energies

Abstract

We calculate the shadowing effect in nuclear photoabsorption at low photon energies (1-3 GeV) within a multiple scattering approach. We avoid some of the high energy approximations that are usually made in simple Glauber theory like the narrow width and the eikonal approximation. We find that the main contribution to nuclear shadowing at low energies stems from ${\rho }^0$ mesons with masses well below their pole mass. We also show that the possibility of scattering in non forward directions allows for a new contribution to shadowing at low energies: the production of neutral pions as intermediate hadronic states enhances the shadowing effect in the onset region. For light nuclei and small photon energies they give rise to about 30% of the total shadowing effect.

RevTeX, 16 pages including 6 eps figures; new calculation of effective pion propagator, negligible effect on results; version to be published in Phys. Rev. C

References in corpus (3)

• Photon- and meson-induced reactions on the nucleon
• Photoabsorption on nuclei in the shadowing threshold region
• Low energy onset of nuclear shadowing in photoabsorption

Cited by in corpus (7)

• Photoproduction of phi mesons from nuclei
• Determination of the real part of the η'-Nb optical potential
• Momentum dependence of the imaginary part of the $\omega$- and ${\eta }^{\prime }$-nucleus optical potential
• The η'-carbon potential at low meson momenta
• Hadron formation in high energy photonuclear reactions
• Shadowing in photo-production : role of in-medium hadrons
• Role of in-medium hadrons in photon-nucleus reactions : shadowing and dilepton spectrum