Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-09-15
J.Phys. G32 (2006) 251-268
Physics
High Energy Physics
High Energy Physics - Phenomenology
Final version published in J. Phys. G. 17 pages, 9 figures
Scientific paper
10.1088/0954-3899/32/3/002
We perform a microscopic evaluation of nuclear GPDs for spin-0 nuclei in the framework of the Walecka model. We demonstrate that the meson (non-nucleon) degrees of freedom dramatically influence nuclear GPDs, which is revealed in the non-trivial and unexpected A-dependence of DVCS observables. In particular, we find that the first moment of the nuclear D-term, d_A(0) ~ A^2.26, which confirms the earlier prediction of M.Polyakov. We find that in the HERMES kinematics, contrary to the free proton case, the nuclear meson degrees of freedom in large nuclei enhance the nuclear DVCS amplitude which becomes comparable to the Bethe-Heitler amplitude, and, thus, give the non-trivial A-dependence to the DVCS asymmetries: as a function of the atomic number the beam-charge asymmetry increases whereas the beam-spin asymmetry decreases slowly.
Guzey Vadim
Siddikov Marat
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