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- W2003162209 abstract "We present a dynamical study of $e^+e^-$ production in $pi^-$A reactions at 1.3 and 1.7 GeV on the basis of the Coupled-Channel-BUU approach. The contributions from vector mesons ($rho,omega$) are calculated taking into account the collisional broadening effect and are compared to background sources in the dilepton spectrum from the Dalitz decays of $omega$ and $eta$ mesons produced in the reaction. Two possible scenarios for the medium modifications of the vector mesons are investigated, i.e. the 'dropping mass' scheme for the $rho$ and $omega$ and a momentum dependent $rho$-meson spectral function that includes the polarization of the $rho$-meson due to resonant $rho -N$ scattering." @default.
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- W2003162209 doi "https://doi.org/10.1103/physrevc.59.919" @default.
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