Enhancement of {pi}A{r_arrow}{pi}{pi}A threshold cross sections by in-medium {pi}{pi} final state interactions
- Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800 (United States)
- Physics Department, Mount Holyoke College, South Hadley, Massachusetts 01075 (United States)
- Institut fuer Kernphysik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)
- Institut fuer Kernphysik, Schlossgartenstrasse 9, TU-Darmstadt, D-64289 Darmstadt (Germany)
- IPN, IN2P3-CNRS/Universite Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918 F-69622 Villeurbanne Cedex (France)
- ISN, IN2P3-CNRS/Universite Joseph Fourier, 53 Avenue de Martyrs, F-38026 Grenoble Cedex (France)
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{emdash}followed by the decay into two pions and a nucleon{emdash}of the N{sup {asterisk}}(1440) resonance. The production amplitude is modified by the final state interaction between the pions calculated using the chirally improved J{umlt u}lich meson exchange model including the polarization of the nuclear medium by the pions. The model reproduces well the experimentally observed {pi}A{r_arrow}{pi}{pi}A cross sections, especially the enhancement with increasing {ital A} of the {pi}{sup +}{pi}{sup {minus}} mass distribution in the threshold region. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 322022
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 59; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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