Temperature Measurement of QGP via Thermal Dileptons

Thermal dileptons, emitted throughout the medium evolution, are suggested as excellent penetrating probes of the extremely  hot and dense QCD medium created in relativistic heavy-ion collisions. The invariant mass distribution of thermal dileptons can reveal the temperature of their emitting source suffering neither from the blue-shift effect nor from the final-state interactions. Furthermore, the mass spectra of thermal dileptons radiated from the in-medium 𝜌 meson and QGP dominant regions can reflect the temperatures of hot QCD matter averaged over the dense hadronic phase and the deconfined partonic phase (QGP), respectively. In this talk, we will review the recent progress on the temperature measurements of hot QCD matter via thermal dilepton productions in heavy-ion collisions.