2017/05/31 by B. Pire, L. Szymanowski, J. Wagner
Physics and Astronomy · #hep-ph #hep-ex #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.95.114029
published as Phys. Rev. D 95, 114029 (2017) · 9 pages, 8 figures. second version (to be published in Phys Rev D): misprint in name of second author corrected; one added reference; minor misprints corrected. arXiv admin note: text overlap with arXiv:1702.00316
arxiv created 2017/06/07 · arxiv updated 2017/07/05
We update the leading order in αs QCD amplitude for deep exclusive neutrino and antineutrino production of a light meson on an unpolarized nucleon. The factorization theorems of the collinear QCD approach allow us to write the amplitude as the convolution of generalized parton distributions (GPDs) and perturbatively calculable coefficient functions. We study both the pseudoscalar meson and longitudinally polarized vector meson cases. It turns out that, contrarily to the electroproduction case, the leading twist scattering amplitudes for π and ρL productions are proportional to one another, which may serve as an interesting new test of the leading twist dominance of exclusive processes at medium scale. The dominance of the gluonic contribution to most cross sections is stressed.