Production of e+e− from U+U collisions at sNN=193 GeV and Au+Au collisions at sNN=19.6,27,39,62.4, and 200 GeV as measured by STAR

We present STAR's measurement of the e+e− continuum as a function of centrality, invariant mass, and transverse momentum for U+U collisions at sNN=193 GeV. Also reported are the acceptance-corrected e+e− invariant mass spectra for minimum-bias Au+Au collisions at sNN=27,39, and 62.4 GeV and U+U collisions at sNN=193 GeV. The connection between the integrated e+e− excess yields normalized by charge particle multiplicity (dNch/dy) at mid-rapidity and the lifetime of the fireball is discussed.