Speaker
Description
The Multi-Purpose Detector (MPD) at the NICA facility is designed to study heavy-ion collisions at $\sqrt{s_{NN}} = 4$–$11$ GeV, aiming to explore the baryon-rich region of the QCD phase diagram to investigate the possible existence of a first-order phase transition and a critical end-point. Dilepton measurements, particularly the invariant mass spectrum of dielectrons, serve as a key electromagnetic probe sensitive to the initial temperature, chiral symmetry restoration, and lifetime of the hot dense medium.
We will present a feasibility study of dielectron production in $\sqrt{s_{NN}} = 9.2$ GeV Bi+Bi collisions using full MPD detector simulations with realistic event generators. Details will be provided on electron reconstruction using the Time Projection Chamber (TPC), Time-of-Flight (TOF) detector, and Electromagnetic Calorimeter (ECal), background suppression techniques for photon conversions and $\pi^0$ Dalitz decays and performance evaluation based on signal-to-background ratio (S/B) and statistical significance ($n_{\sigma}$). These established reconstruction and background suppression procedures provide support for future experimental data analysis, and the results verify the ability of MPD to perform high-precision dilepton measurements.
