On neutrino production of a charmed meson
Résumé
We calculate in the framework of the collinear QCD approach the amplitude for exclusive neutrino-production of a pseudoscalar charmed D meson. This process allows to access gluon and both chiral-odd and chiral-even quark generalized parton distributions (GPDs), which contribute in specific ways to the amplitude for different polarization states of the W boson. The energy dependence of the cross section allows to separate different contributions and the measurement of the azimuthal dependence helps to single out the transversity chiral-odd GPDs contributions. The flavor dependence, and in particular the difference between D^+ and D^0 production rates, allows to test the importance of gluonic contributions. The behaviour of the proton and neutron target cross sections enables to separate the u and d quark contributions. Planned medium and high energy neutrino facilities will thus allow some important progress in the realm of hadronic physics.