Off-shell pions in Boltzmann-Uehling-Uhlenbeck transport theory

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.

16 pages, 7 figures; kaon results are postponed for future publication; version to appear in Phys. Rev. C

References in corpus (1)

• Quenching of resonance production in heavy-ion collisions at 1-2 A GeV

Cited by in corpus (6)

• Transport-theoretical Description of Nuclear Reactions
• Pion production in the MiniBooNE experiment
• The N N -> N Delta cross section in nuclear matter
• Constraining nucleon high momentum in nuclei
• Kaon production and propagation at intermediate relativistic energies
• In-medium pion dispersion relation and medium correction of $N\pi \leftrightarrow \Delta$ near the threshold energy of pion production