Probing the transversity spin structure of a nucleon in   neutrino-production of a charmed meson
  Including O(m_c) terms in the coefficient functions and/or O(m_D) twist 3 contributions in the heavy meson distribution amplitudes leads to a non-zero transverse amplitude for exclusive neutrino production of a D pseudoscalar charmed meson on an unpolarized target. We work in the framework of the collinear QCD approach where chiral-odd transversity generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. 
B. Pire, L. Szymanowski and J. Wagner
hep-ph hep-ex nucl-ex nucl-th