Abstract
We calculate the amplitude for exclusive electroweak production of a pseudoscalar ${D}_{s}$ or a vector ${D}_{s}^{*}$ charmed strange meson on an unpolarized nucleon, through a charged current, in leading order in ${\ensuremath{\alpha}}_{s}$. We work in the framework of the collinear QCD approach where generalized gluon distributions factorize from perturbatively calculable coefficient functions. We include both $O({m}_{c})$ terms in the coefficient functions and $O({M}_{D})$ mass term contributions in the heavy meson distribution amplitudes. We show that this process may be accessed at future electron-ion colliders.
Highlights
Exclusive electroproduction processes involving charged currents have not been discussed much up to now, with the notable exception of the pioneering work [1]
The reason is simple as the smallness of the weak coupling prevents exclusive cross sections from being large enough to allow sufficient counting rates at existing electron-nucleon facilities
The very high luminosity anticipated at planned high-energy electron-ion colliders [2,3] should open this physics domain to a detailed investigation of various interesting channels
Summary
Exclusive electroproduction processes involving charged currents (i.e., through a WÆ exchange) have not been discussed much up to now, with the notable exception of the pioneering work [1]. The very high luminosity anticipated at planned high-energy electron-ion colliders [2,3] should open this physics domain to a detailed investigation of various interesting channels In this respect, the production of a single charmed meson—which is forbidden in pure electromagnetic processes—is a specific way to study various features of hadronic physics, and in particular the effects of the heavy quarks mass in the framework of collinear QCD factorization [4]. The well-established framework of collinear QCD factorization [5,6,7] for scattering amplitudes in exclusive electroproduction, in reactions mediated by a highly virtual photon, may be applied to reactions mediated by a virtual WÆ boson, in a similar generalized Bjorken regime [8].
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