Dileptons as a probe of excited nuclear matter

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Abstract
The general features of dilepton production from nucleon–nucleon and nucleus–nucleus collisions are discussed. Estimates are made of the thermal production rates arising from incoherent nucleon–nucleon scattering and from two-pion annihilation. It may be possible to infer the pion dispersion relation in hot, dense nuclear matter by measuring the invariant mass distribution of back-to-back electrons and positrons in the center of mass frame in high energy nucleus–nucleus collisions. Comparison with recent data on p + Be → e+e−X at 4.9 GeV from the Bevalac is made.

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