We present a unified description of e+ e- dilepton production in heavy ion collisions at relativistic (3.7A GeV) and ultrarelativistic (200A GeV) energies. From the interactions of [12C and 22Ne] at 3.7A GeV and 32S at 200A GeV with nuclear emulsion, 134 e+ e- pairs are observed. The differential distribution of the energy asymmetry of pairs is compared to a background observation at Bristol. The events are consistent in a way that, they scale well in a single curve of exponential decay. This ensures correct asymptotics and provides a unified description of mesonic decay. The existence of light neutral boson of mass (1.55±0.14 MeV/c2) is questionable, because the candidate peak is seen in the invariant mass spectrum of its decay into e+ e- pairs. The data seem to suggest the production and subsequent decay of short lived neutral boson with lifetime of the order of 10-16 S.
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