Enhancement of $\pi A \to \pi\pi A$ threshold cross sections by in-medium $\pi\pi$ final state interactions - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 1999

Enhancement of $\pi A \to \pi\pi A$ threshold cross sections by in-medium $\pi\pi$ final state interactions

R. Rapp
  • Function : Author
J.W. Durso
  • Function : Author
Z. Aouissat
  • Function : Author
O. Krehl
  • Function : Author
J. Speth
  • Function : Author
J. Wambach
  • Function : Author

Abstract

We address the problem of pion production in low energy $\pi$-nucleus collisions. For the production mechanism we assume a simple model consisting of a coherent sum of single pion exchange and the excitation---followed by the decay into two pions and a nucleon---of the $N^*(1440)$ resonance. The production amplitude is modified by the final state interaction between the pions calculated using the chirally improved Jülich meson exchange model including the polarization of the nuclear medium by the pions. The model reproduces well the experimentally observed $\pi A \to \pi\pi A$ cross sections, especially the enhancement with increasing $A$ of the $\pi^+\pi^-$ mass distribution in the threshold region.

Dates and versions

in2p3-00005120 , version 1 (31-03-1999)

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Cite

R. Rapp, J.W. Durso, Z. Aouissat, G. Chanfray, O. Krehl, et al.. Enhancement of $\pi A \to \pi\pi A$ threshold cross sections by in-medium $\pi\pi$ final state interactions. Physical Review C, 1999, 59, pp.R1237-R1241. ⟨10.1103/PhysRevC.59.R1237⟩. ⟨in2p3-00005120⟩
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