Abstract
The study of 3π and 4π meson production in np interactions was carried out at the momenta of incident neutrons P0 = 3.83, 4.42 and 5.20 GeV/c. The characteristics of the reactions were satisfactorily described by OPER model. For the better description of the reaction np → pp π + π − π − π 0 it was necessary to take into account the production of η 0 and ω 0 mesons.
Highlights
The study of multipion production in NN collisions is one way to obtain information about the NN, πN and ππ states, including: dibaryons, dipions, pentaquarks (I=5/2, S=+1), missing resonances, etc. the important task is the test of various models of pion production in NN interaction, such as, for example, Valencia model [1], Xu Cao model [2] and OPER model [3, 4]
One can see a good agreement between the experimental data and theoretical calculations
The results of the calculations using OPER model for the reaction np → ppπ+ π− π− π0 are shown in figure 5 for the data at P0 = 5.20 GeV/c
Summary
The study of multipion production in NN collisions is one way to obtain information about the NN, πN and ππ states, including: dibaryons (including I=2 in ppπ+ ), dipions (narrow σ0 meson, ππ state with I=2), pentaquarks (I=5/2, S=+1), missing resonances, etc. The unique in fullness and precision data were obtained. It allowed to carry out the detailed study of inelastic np interactions in in a wide range of energies using the quasimonochromatic neutrons with P0
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