SMuK 2023 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Heavy-Ion Collisions and QCD Phases I

HK 5.2: Talk

Monday, March 20, 2023, 16:45–17:00, SCH/A216

Probing rapidity structure of A-A events with correlations of particle number ratios — •Igor Altsybeev for the ALICE Germany collaboration — Technische Universität München, James-Franck-Straße 1, 85748 Garching bei München

Measurements of fluctuations allow one to study phase transitions and other collective phenomena in systems formed in high-energy hadronic collisions. In this report, we will discuss properties of a recently proposed fluctuation observable, namely, the correlation coefficient between ratios of identified particle yields measured in two angular acceptance windows. With such an observable it is possible, for instance, to study the correlation between relative strangeness yield in separated rapidity intervals, which should be sensitive to the density of the fireball formed in A-A collisions. Such correlations are also sensitive to various short-range effects, in particular, they are affected by spin statistics. We will show first experimental measurements of particle ratio correlations in pp and Pb-Pb data recorded by ALICE, and compare with predictions from several models that include various physics effects. Such comparison allows one to exclude some of the models.

This work is supported by BmBf.