Speaker
Description
Correlated electron-positron pairs (dielectrons) are a unique probe for studying the properties of the medium created in relativistic heavy-ion collisions. They are produced at all stages of the collision and leave the system without loss of information, as they do not interact strongly with the medium. However, at LHC energies, thermal dielectrons emitted in the early stages of the collision from the quark-gluon plasma are outnumbered by a large contribution of correlated e$^{+}$e$^{-}$-pairs from semi-leptonic decays of heavy-flavor (HF) hadrons.
With the upgrade of the ALICE detector for LHC Run 3, the sensitivity to thermal dielectrons is improved. Continuous readout of the TPC allows for a higher data acquisition rate of up to 50 kHz in Pb$-$Pb collisions. Moreover, the new ITS with its higher granularity and closer proximity to the interaction point improves the pointing resolution, leading to a better topological separation of prompt thermal radiation and non-prompt e$^{+}$e$^{-}$ pairs from HF hadron decays.
This poster presents the analysis of dielectron production in Pb$-$Pb collisions at $\sqrt{s_{\rm{NN}}}=5.36$ TeV, recorded with the upgraded ALICE detector in Run 3. The distance of closest approach (DCA) of the electrons to the primary vertex of the collision will be investigated, and the impact of the detector upgrades on the dielectron analysis will be shown.
| Is this an experimental talk? | Yes |
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| Is this on behalf of a collaboration? | Yes |
| Which collaboration? | ALICE Collaboration |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |