Off-shell pions in Boltzmann-Uehling-Uhlenbeck transport theory
Nuclear Theory
2011-01-25 v3
Abstract
Due to large pi N --> Delta cross section a pion acquires a large width in nuclear matter. Therefore, a Delta-resonance decaying in the nuclear medium can produce far off-shell pions, which will gradually lose their virtuality while propagating to the vacuum. To describe such off-shell dynamics, we implemented a pion spectral function for finite nuclear matter density -- calculated on the basis of the Delta-hole model -- in the BUU transport approach. The pion off-shell dynamics leads to an enhancement of the low-p_t pion yields in the collisions of Au+Au at 1 A GeV.
Keywords
Cite
@article{arxiv.nucl-th/0202008,
title = {Off-shell pions in Boltzmann-Uehling-Uhlenbeck transport theory},
author = {A. B. Larionov and U. Mosel},
journal= {arXiv preprint arXiv:nucl-th/0202008},
year = {2011}
}
Comments
16 pages, 7 figures; kaon results are postponed for future publication; version to appear in Phys. Rev. C