Exclusive neutrino-production of a charmed vector meson and transversity gluon GPDs

TL;DR

This paper calculates the leading order QCD amplitude for exclusive neutrino-induced production of charmed vector mesons, highlighting how decay angular distributions can probe transversity gluon GPDs.

Contribution

It introduces a leading order calculation including mass corrections and links decay angular analysis to accessing transversity gluon GPDs.

Findings

Provides a framework for accessing transversity gluon GPDs via decay angular distributions.

Includes mass corrections in the calculation of the amplitude.

Establishes a method to study gluon GPDs through neutrino-induced processes.

Abstract

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 $O(m_D)$ term in the definition of heavy meson distribution amplitudes. The show that the analysis of the angular distribution of the decay $D_{(s)}^*\to D_{(s)} \pi$ allows to access the transversity gluon GPDs.