EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 4, 349-355

The $N(p,2\pi)2N$ reactions near threshold

D.A. Zaikin - I.I. Osipchuk

Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia

Received: 10 June 1997 / Revised version: 12 January 1998 Communicated by W. Weise

Abstract
A preliminary calculation of the total cross sections for the reactions $pn\to pn\pi^+\pi^-$, $pp\to pp\pi^+\pi^-$, $pp\to pp\pi^0\pi^0$,and $pp\to nn\pi^+\pi^+$ was carried out for the incident proton energy range $E_{p}\mathrel{\mathchoice {\vcenter{\offinterlineskip\halign{\hfil $\displaysty... ...\offinterlineskip\halign{\hfil$\scriptscriptstyle ... MeV. This calculation was done in the framework of a model based on a version of the standard effective chiral Lagrangian, for which only three- and four-pion diagrams were taken into account together with diagrams containing two two-pion vertices. The invariant amplitudes were calculated to the threshold approximation. It was shown that for a reliable description of the reactions under consideration it is necessary to take into account the N*(1440) mechanism too. The final state interaction of the nucleons was also considered. Results of the calculation are compared with available experimental
data.

PACS
13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy $\le 10$GeV) - 13.75.Cs Nucleon-nucleon interactions

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