Nuclear shadowing at low photon energies

Details Nuclear shadowing at low photon energies Nuclear shadowing at low photon energies

2001-02-26

arxiv.org/abs/nucl-th/0102058v2

Phys.Rev. C64 (2001) 024608

Physics

Nuclear Physics

Nuclear Theory

RevTeX, 16 pages including 6 eps figures; new calculation of effective pion propagator, negligible effect on results; version

Scientific paper

10.1103/PhysRevC.64.024608

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.

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