Non-Gaussian sources and the shape of the correlation function

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Search for the critical end point Poster Session

Speaker

Jakub Cimerman (Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University)

Description

Correlation femtoscopy is a standard technique for the experimental analysis of ultrarelativistic nuclear collisions. The measured two-particle correlation function is clearly non-Gaussian, and so it is often better reproduced by Levy stable distribution than a Gaussian one. It has been suggested that a particular shape of a Levy-stable distribution may help to identify the QCD critical endpoint. In order to set up a baseline for this statement, we show that there are non-critical effects that may influence its shape as well. By making use of two independent models (hydrodynamical simulation and a blast wave parametrisation) we estimate how much the individual effects modify the shape. We show that the Levy index may deviate considerably from 2 due to effects such as non-spherical shape, resonance decays, event-by-event fluctuations and functional dependence on $q_{inv}$ and/or $q_{lcms}$.

Primary authors

Jakub Cimerman (Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University) Boris Tomasik (Univerzita Mateja Bela (SK)) Christopher Plumberg

Presentation Materials