Speaker
Description
In the recent decades of high energy physics, it was revealed that in ultra-realistic ion-ion collisions, a strongly interacting quark-gluon plasma (sQGP) is created. One of the most important goals of NA61/SHINE is to investigate and understand the phase structures of this matter. The investigation of the phase-diagram can be achieved by varying the collision energy or by changing the collision system. Investigating femtoscopic correlations in these collisions reveals the space-time structure of the hadron emitting source of the sQGP.
Here we report the comparison of the measurements of femtoscopic Bose-Einstein correlations in Be+Be and Ar+Sc collisions at 150A GeV/c beam momentum. Comparing the measurements to calculations based on alpha-stable symmetric Levy sources, we discuss the average pair transverse mass dependence of the source parameters. One of the source parameters, the Levy exponent alpha, is of particularly importance. It describes the shape of the source, which, in the vicinity of the critical point of the phase diagram, may be related to the critical exponent eta. Its measurement hence may contribute to the search for and characterization of the critical end point of the phase diagram.
