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 \( \pi^{-}p\rightarrow M^{0}n\) and \( K^{-}p\rightarrow M^{0}\Lambda\), \( M^{0}=\pi^{0},\eta,\eta'\), 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-\( 4\pi\) data in the differential cross-section \( K^{-}p\rightarrow\eta\Lambda\) at \( \vert t\vert\approx 0.4-0.5\) (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 \( \eta\)-\( \eta{^\prime}\) mixing and gluonium admixture in \( \eta{^\prime}\) are obtained.
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Nekrasov, M.L. Charge-exchange reactions from the standpoint of the parton model. Eur. Phys. J. A 51, 148 (2015). https://doi.org/10.1140/epja/i2015-15148-2
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DOI: https://doi.org/10.1140/epja/i2015-15148-2