Exclusive neutrino production of a charmed vector meson and transversity gluon generalized parton distributions

We calculate at the leading order in alpha(s) the QCD amplitude for exclusive neutrino production of a D* or D*(s) charmed vector meson on a nucleon. We work in the framework of the collinear QCD approach where generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. We include O(m(c)) terms in the coefficient functions and the O(m(D)) term in the definition of heavy meson distribution amplitudes. The show that the analysis of the angular distribution of the decay D* D*((S)) -> D-(S)pi allows us to access the transversity gluon GPDs.