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A measurement for studying the mass dependence of the dilepton interferometryin relativistic heavy-ion collision experiments as a tool to characterize thequark-gluon phase is proposed. In calculations involving dileptons, we showthat the mass dependence of radii extracted from the virtual photon (dilepton)interferometry provide access to the development of collective flow with time.It is argued that the non-monotonic variation of HBT radii with invariant massof the lepton pairs signals the formation of quark gluon plasma in heavy ioncollisions. Our proposal of experimentally measuring the ratio, $R_{\mathrmout}/R_{\mathrm side}$ for dileptons can be used to estimate the average lifetimes of the partonic as well as the hadronic phases.

Evolution of collectivity as a signal of quark gluon plasma formation in heavy ion collisions