Generalized parton distributions of 3He -: art. no. 015205

A realistic microscopic calculation of the unpolarized quark generalized parton distribution (GPD) H-q(3) of the He-3 nucleus is presented. In impulse approximation, H-q(3) is obtained as a convolution between the GPD of the internal nucleon and the non-digonal spectral function, describing properly Fermi motion and binding effects. The proposed scheme is valid at low values of Delta(2), the momentum transfer to the target, the most relevant kinematical region for the,coherent channel of hard exclusive processes. The obtained formula has the correct forward limit, corresponding to the standard deep inelastic nuclear parton distributions, and first moment, giving the charge form factor of He-3. Nuclear effects, evaluated by a modern realistic potential, are found to be larger than in the forward case. In particular, they increase with increasing the momentum transfer when the asymmetry of the process is kept fixed, and they increase with the asymmetry at fixed momentum transfer. Another relevant feature, of the obtained results is that the nuclear GPD cannot be factorized into a Delta(2)-dependent and a Delta(2)-independent term, as suggested in prescriptions proposed for finite nuclei. The size of nuclear effects reaches 8% even in the most important part of the kinematical range under scrutiny. The relevance of the obtained results to study the feasibility of experiments is addressed.