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- W2045917664 abstract "The production of low mass dileptons from $ensuremath{pi}$-$ensuremath{rho}$ interactions in a hot medium is studied. Applying finite temperature perturbation theory the dilepton rate is computed up to order ${g}_{ensuremath{rho}}^{2}.$ For dilepton masses below the $ensuremath{rho}$ the two-body reactions $ensuremath{pi}ensuremath{pi}ensuremath{rightarrow}ensuremath{rho}{ensuremath{gamma}}^{*}$, $ensuremath{pi}ensuremath{rho}ensuremath{rightarrow}ensuremath{pi}{ensuremath{gamma}}^{*}$, and the decay process $ensuremath{rho}ensuremath{rightarrow}ensuremath{pi}ensuremath{pi}{ensuremath{gamma}}^{*}$ give significant contributions. Nonequilibrium contributions to the thermal rate are estimated, including the modification of the particle distribution function with a nonzero pion chemical potential. A comparison of the dilepton rate with the recent data measured in nucleus-nucleus collisions at CERN SPS energy by the CERES Collaboration is also performed. It is shown that the additional thermal dileptons from $ensuremath{pi}$-$ensuremath{rho}$ interactions can partially account for the excess of the soft dilepton yield seen experimentally." @default.
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- W2045917664 date "1997-04-01" @default.
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- W2045917664 title "Thermal dileptons fromπ-ρinteractions in a hot pion gas" @default.
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