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HK: Fachverband Physik der Hadronen und Kerne
HK 72: Poster
HK 72.14: Poster
Thursday, March 14, 2024, 17:15–18:45, HBR 14: Foyer
Prefilter methods in dielectron measurements in pp collisions at √s = 13.6 TeV at ALICE in Run 3 — •Davud Sokolovic — Goethe Universität Frankfurt
Thermal radiation in form of e+e− pairs carry undistorted information about the properties of the quark-gluon plasma (QGP) produced in heavy-ion collisions. However, the separation of dielectrons emitted by the QGP and the other sources is a highly non-trivial task. Therefore dielectron measurements in pp collisions, where no medium effects are expected in first order, serve as reference. Here, the main sources of e+e− pairs at low invariant mass are light- and heavy-flavour hadron decays, as well as background from real photon conversions in the detector material. In particular, electrons from π0-Dalitz decays and real photon conversions contribute to the combinatorial background up to a relatively large mass and reduce the signal-to-background ratio and significance of the measurements.
In this poster, we will explain how the contribution from electrons from π0-Dalitz decays and real photon conversion can be suppressed in the electron candidate sample with prefilter methods. Such techniques will be applied and optimised in the analysis of the ALICE pp data at 13.6 TeV recorded in 2022. The improvement will be quantified in terms of significance and signal-to-background ratio.
Keywords: Dielectrons; ALICE; CERN; pp collisions; Prefilter