PASTOR, J.; CAILLON, J.C.; LABARSOUQUE, J.

doi:10.1016/j.nuclphysa.2005.04.016

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PASTOR, J.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

CAILLON, J.C.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

LABARSOUQUE, J.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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Nuclear Physics A. 2005, vol. 757, p. 456-475

Elsevier

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We have studied the $\pi^{+}\pi^{-} \rightarrow e^+e^-$ 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 $\pi^+\pi^- \rightarrow \rho \rightarrow {e^+e^-}$ dilepton production rate in the low invariant mass region as required by the experimental data.< Leer menos

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Nuclear matter

Relativistic hadronic models

Dilepton production rate

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Two-pion annihilation into e+e−pairs in relativistic non-linear models

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