Lepton pair photoproduction in hadronic heavy-ion collisions with nuclear overlap

Lepton pair photoproduction provides a unique probe of the strong electromagnetic field produced in ultrarelativistic heavy-ion collisions. To map out the broadening behavior of the lepton pair transverse momentum with respect to the back-to-back correlation structure, we present a theoretical model based on the equivalent photon approximation, and then we update it to make direct comparisons with the recent experimental measurements. We find that the model calculations can describe well not only the average transverse momentum squared of e^+e^- pairs in Au-Au collisions at s₍₍=2004pt{0ex}GeV, but also the acoplanarity of ^+^- pairs in Pb-Pb collisions at s₍₍=5. 02 TeV. Furthermore, the model predictions are also able to reproduce the measured lepton pair mass and transverse momentum squared distributions.