Low-mass dielectrons in pp, p–Pb and Pb–Pb collisions measured by the ALICE Experiment
Physik Department, Technische Universität München, Munich, Germany
2 Excellence Cluster Universe, Technische Universität München, Munich, Germany
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Published online: 2 February 2018
Dielectrons produced in ultra-relativistic heavy-ion collisions at the LHC provide a unique probe of the system evolution as they are unperturbed by final-state interactions. The dielectron continuum is extremely rich in physics sources: on top of ordinary Dalitz and resonance decays of pseudoscalar and vector mesons, thermal black-body radiation is of particular interest as it carries information about the temperature of the hot and dense system created in such collisions. The dielectron invariant-mass distribution is furthermore sensitive to medium modifications of the spectral function of short-lived vector mesons that are linked to the potential restoration of chiral symmetry at high temperatures. Correlated electron pairs from semi-leptonic charm and beauty decays provide complementary information about the heavy-quark energy loss.
© The Authors, published by EDP Sciences, 2018
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