Eur. Phys. J. A (2015) 51: 148
https://doi.org/10.1140/epja/i2015-15148-2

Regular Article - Theoretical Physics

Charge-exchange reactions from the standpoint of the parton model

SRC Institute for High Energy Physics of NRC “Kurchatov Institute”, 142281, Protvino, Russia

^* e-mail: nekrasov@ihep.ru

Received: 6 August 2015
Accepted: 26 October 2015
Published online: 23 November 2015

Abstract

Using simple arguments, we show that charge-exchange reactions at high energies go through the hard scattering of fast quarks. On this basis we describe and , , in a combined approach which defines hard contributions in the parton model and soft ones in Regge phenomenology. The disappearance of a dip according to recent GAMS- data in the differential cross-section at (GeV/c)² at transition to relatively high momenta, is explained as a manifestation of a mode change of summation of hard contributions from coherent to incoherent. Other manifestations of the mentioned mode change are discussed. Constraints on the - mixing and gluonium admixture in are obtained.