Speaker
Description
Electromagnetic probes such as dileptons are a unique tool for studying the space-time evolution of the hot and dense matter created in ultra-relativistic heavy-ion collisions. Such pairs, being emitted throughout the entire system evolution, carry information from the moment of their creation to the detector unperturbed by strong final-state interactions, allowing one to get a direct access to the thermal radiation from early hot stages of the collision. At the LHC energies however, this signal sits on top of a large background from correlated semi-leptonic heavy-flavour decays, which makes the separation of prompt and non-prompt sources vital for the measurement of thermal radiation. The studies of dilepton production in proton–proton or light ions can shed light on possible onset of thermal radiation in smaller systems.
This talk will present an overview of ALICE results on the low-mass dielectron and dimuon production in pp, OO and Pb–Pb collisions at various collision energies using high-precision data collected during the LHC Run 3. The dilepton yield is compared to the sum of all known hadronic sources. Thanks to the new inner tracking system, the dielectrons from heavy-flavour hadrons can be identified and separated from the prompt sources using a data-driven approach.
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