Speaker
Ms
Roli Esha
(UCLA)
Description
Fluctuations and correlations of conserved quantities (baryon number, strangeness, and charge) can be used to probe phases of strongly interacting QCD matter and the possible existence of a critical point in the phase diagram. The cumulants of the multiplicity distributions related to these conserved quantities are expected to be sensitive to possible increased fluctuations near a critical point and their ratios can be directly compared to the ratios of the susceptibilities from Lattice QCD.
In this talk, we will present the measurements of the cumulants of net-proton multiplicity distributions from Au+Au collisions at √sNN = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4 (up to fourth order) and 200 GeV (up to sixth order) as measured by the STAR experiment at RHIC. Multi-particle correlation functions will also be presented.
The higher order cumulants are also very sensitive to experimental artifacts that one has to deal with in the analyses of heavy-ion collision data. We will demonstrate a data-driven approach to measure the cumulants of event-by-event distributions of physical variables using large samples of AMPT events. Our approach investigates the corrections for non-Binomial detector response and efficiency variations. The comparison of the various correction approaches should provide important guidance towards a reliable experimental determination of the multiplicity cumulants.
Author
Ms
Roli Esha
(UCLA)
