Speaker
Description
The extraction of thermal freezeout parameters from measured hadron yields
and their higher moments have met with considerable success within the frame-
work of hadron resonance gas models. The standard assumption in such studies
is to consider a constant freezeout parameter set which is extracted by chi-square
fit to data. However, in reality, thermal conditions at freezeout need not be con-
stant. They can fluctuate event by event as well as in the same event, there
could be a distribution of temperatures and chemical potentials over freezeout
spacetime points instead of a constant value. In this study we set up the frame-
work to study such possible fluctuations in thermal freezeout conditions and
extract them by comparing the model predictions to mean hadron multiplicities
and their higher moments. We utilise all available data across beam energies
and centralities. The extracted thermal parameters and their higher moments
and the goodness of fits are compared to the standard scenario of constant ther-
mal parameters. Understanding the nature of fluctuation of freezeout thermal
parameters has significant implications on the ongoing searches for the QCD
critical point.
