München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Heavy-Ion Collisions and QCD Phases X

HK 58.2: Talk

Friday, March 22, 2019, 14:30–14:45, HS 15

Recent net-baryon fluctuation results from ALICE in view of the effect of detection efficiency losses — •Mesut Arslandok for the ALICE collaboration — Physikalisches Institut Heidelberg

In a thermal system, fluctuations of particle yields are directly encoded in the equation of state of the system under the study. By measuring event-by-event fluctuations over an ensemble of events via cumulants or moments of particle multiplicity distributions, one can study the freeze-out conditions in heavy-ion collisions and clarify their relation to the QCD phase transition. Higher order cumulants of fluctuations of conserved quantities like electric charge and baryon number are related to thermodynamic susceptibilities, which can be calculated in the Grand Canonical Ensemble formulation of thermodynamics such as Lattice QCD or statistical models. Cumulants beyond the second order are more sensitive to the underlying physics however experimentally more challenging. In particular the effect of finite detection efficiency losses drastically influences the measurements. In this contribution, recent experimental results on event-by-event analysis of net- baryon number fluctuation measurements in Pb-Pb collisions recorded by the ALICE Collaboration at the CERN LHC will be presented. The cumulants of net-proton, used as a proxy to net-baryon, results up to third order will be discussed in view of the effect of detection efficiency losses.

Supported by BMBF and SFB 1225 ISOQUANT.