Abstract
Spectra of thermal photons carry important information on the temperature of the hot and dense medium produced in heavy ion collisions. Photons can be measured via their conversion into electron-positron pairs in the detector material. In this contribution, challenges in the photon reconstruction are discussed and feasibility studies on photon conversion measurements in the future multipurpose detector (MPD) experiment at NICA are presented. The obtained results indicate good prospects for thermal photon measurements.
Highlights
D.; Malaev, M.; Riabov, V.; The future multipurpose detector (MPD) at the Nuclotron-based Ion Collider fAcility (NICA) is aimed towards the studies of hot and dense medium produced in heavy ion collisions in the range of center-of-mass energies sNN = 4 to 11 GeV [1]
Collider (LHC) corresponding to vanishing net baryonic densities, the matter produced in the NICA energy range is expected to reach large baryonic densities far exceeding the normal nuclear density ρ0
According to several model calculations described in [2], the nuclear fireball created in central heavy ion collisions will be compressed to a density above 8ρ0 already at the lowest NICA energy of sNN = 4 GeV
Summary
D.; Malaev, M.; Riabov, V.; The future multipurpose detector (MPD) at the Nuclotron-based Ion Collider fAcility (NICA) is aimed towards the studies of hot and dense medium produced in heavy ion. Heavy ion collisions at NICA complement experimental efforts at RHIC and LHC colliders in the studies of the phase diagram of nuclear matter and searches for the deconfinement phase transition This energy range will be studied by the STAR experiment in the RHIC beam energy scan. In the first stage of the MPD experiment, photons will mainly be converted in the beam pipe (0.3% X0 ) and in the inner TPC vessel structures (2.4% X0 ) the conversion reconstruction efficiency will hardly exceed a few percent. In this contribution, feasibility studies on photon conversion measurements in the future MPD experiment at NICA are presented
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