The 22nd International Conference on QCD in Extreme Conditions

Possible existence of second phase transtion in A-A collisions at LHC enegies ?

Not scheduled

20m

Pukyong Convention Hall (Pukyong National University)

Oral presentation (contributed) Scientific Contributions Contributed Talks

Speaker

Brijesh Srivastava (Purdue University)

Description

The observed fluid behavior of the matter produced in heavy ion and pp collisions implies that the strings stretched between the constituents of the projectile and target should have a hard core giving rise to a repulsion between them. It is shown that in these collisions there are two critical string densities, one corresponding to the well studied percolation of strings and another to the percolation of the hard core of the strings. These two critical densities are related to two critical temperatures, one T ~ 160 MeV would correspond to the restoration of chiral symmetry and partial deconfinement and a second transition T ~ 220 MeV form the fluid behavior of QCD matter strongly interacting to a quasi free gas of quarks and gluons. This behavior is observed in the recently published results in Pb-Pb and Xe-Xe collisions at LHC energies [1].
[1]. A. N. Mishra, G. Paic, C. Pajares, R. P Scharenberg, and B. K. Srivastava, Exploring the QGP phase above the deconfinement temperature in pp and A-A collisions at LHC energies, Nucl. Phys. A 1046 (2024) 122865.