Hidden dibaryons in one- and two-pion production in NN collisions

M. N. Platonova, V. I. Kukulin

Published 2014-12-15Version 1

Processes of one- and two-pion production in NN collisions in connection with excitation of intermediate dibaryon resonances are considered. In particular, relative contributions of the conventional meson-exchange and dibaryon excitation mechanisms in the reaction pp --> d{\pi}$^+$ are investigated in detail. It is shown that inclusion of the intermediate isovector dibaryon resonances allows to essentially improve the description of experimental data for this reaction, provided the soft short-range cut-off parameters in the {\pi}NN and {\pi}N{\Delta} vertices are used. Manifestation and importance of intermediate isoscalar and isovector dibaryons in the two-pion production processes are also demonstrated. The possibility of investigating the isovector dibaryon resonances in reactions pp --> d{\pi}{\pi} and pp --> pp{\pi}{\pi} is discussed. An explanation of the observed strong differences between two-pion production cross sections in pn and pp collisions based in part on the analysis of dibaryon structure is suggested.