Hard exclusive processes involving kaons

Abstract

Hard exclusive electroproduction of kaons as well as the kaon-induced exclusive Drell-Yan process are investigated within the handbag approach which is based on factorization in hard subprocesses and soft generalized parton distributions (GPDs). The kaon-hyperon transition GPDs occurring here, are related to the proton GPDs by flavor symmetry. The latter ones are taken from analyses of pion electroproduction. Like in hard processes involving pions the transversity GPDs play an important role in the processes of interest -the transverse cross sections are larger than (or, for the Drell-Yan process, about equal to) the longitudinal ones. The evolution of the transversity GPDs is taken into account for the first time but, as the analysis reveals, it is a minor effect in the range of photon virtualities of interest. The predictions for the cross sections agree fairly well with the sparse available electroproduction data.

Study of transversity GPDs from pseudoscalar mesons production at EIC of China

“…We show that if we consider the evolution of GPDs via Q 2 evolution of h T PDF in equation (9), the evolution of H T GPDs, found in [36] is reproduced quite well. The evolution of E T ¯GPDs is rather weak [36] and we do not consider Q 2 evolution in GPDs. Generally, in this work, the explicit form of GPDs evolution is not so important because we work at very limited Q 2 intervals.…”

“…The evolution of transversity GPDs was analyzed in [36]. We show that if we consider the evolution of GPDs via Q 2 evolution of h T PDF in equation (9), the evolution of H T GPDs, found in [36] is reproduced quite well. The evolution of E T ¯GPDs is rather weak [36] and we do not consider Q 2 evolution in GPDs.…”

“…We parameterized E T ¯as equation (8). The evolution of transversity GPDs was analyzed in [36]. We show that if we consider the evolution of GPDs via Q 2 evolution of h T PDF in equation (9), the evolution of H T GPDs, found in [36] is reproduced quite well.…”