Shadowing and antishadowing in neutrino deep inelastic scattering

par Ivan Schmidt (Universidad Federico Santa Maria)

vendredi 27 mai 2005, 14:00 → 15:00 Europe/Paris

Amphithéâtre

The shadowing and antishadowing of nuclear structure functions in the Gribov-Glauber picture is due to the constructive and destructive coherence, respectivly, of amplitudes arising from the multiple-scattering of quarks in the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron and Odderon contributions from multi-gluon exchange as well as Reggeon quark exchange contributions. We show that the rescattering from the Pomeron, Odderon and pseudoscalar Reggeon exchange in the final state leads to shadowing and antishadowing of the electromagnetic nuclear structure functions in agreement with measurement. This picture leads to substantially different nuclear effects for charged and neutral currents, particularly in anti-neutrino reactions, thus affecting the extraction of the weak mixing angle sin²(theta_w) and the constant rho_0 which are determined from the ration of charged and neutral current deep inelastic from neutrino and anti-neutrino scattering.