Two-pion annihilation into pairs in relativistic non-linear models

✍ Scribed by J. Pastor; J.C. Caillon; J. Labarsouque

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 336 KB
• Volume: 757
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2005.04.016

✦ Synopsis

We have studied the π + π -→ e + e -process in dense and hot nuclear matter using relativistic non-linear models taking into account all scalar-vector coupling terms up to fourth order in the Lagrangian. We have determined the influence of non-linear terms on the cross section and dilepton production rate in both isoscalar and isovector channels. For one of the models considered, we have found an enhancement of the π + π -→ ρ → e + e -dilepton production rate in the low invariant mass region as required by the experimental data.