Nuclear Particle Astrophysics (NPA) Seminar, Roy Lacey, Stony Brook University, "Indications for a Critical Point in the Phase Diagram for Hot and Dense Nuclear Matter"

Name: Nuclear Particle Astrophysics (NPA) Seminar, Roy Lacey, Stony Brook University, "Indications for a Critical Point in the Phase Diagram for Hot and Dense Nuclear Matter"
Start: 2015-11-19T15:45:00-05:00
End: 2015-11-19T16:45:00-05:00
Location: WLC 108

Thursday Nov 19, 2015, 3:45 PM → 4:45 PM US/Eastern

WLC 108

Description

An essential goal of the heavy ion experimental programs at RHIC and the LHC, is the mapping of the QCD phase diagram. Pinpointing the location of the phase boundaries and the critical end point (CEP), in the temperature versus baryon chemical potential (T,µB) plane of the nuclear matter phase diagram, is key for this mapping.

I will discuss a recent attempt to locate the CEP via a Dynamic Finite-Size Scaling (DFSS) analysis of the non-monotonic excitation functions for the Gaussian emission source radii difference [(Rout)2 - (Rside)2] obtained from two-pion interferometry measurements in Au+Au (√sNN =7.7–200 GeV) and Pb+Pb (√sNN=2.76 TeV) collisions.

The analysis indicates a second order phase transition at the CEP, with the estimates Tcep ~165 MeV and µBcep ~95 MeV for its location. The critical exponents (ν ~0.66 and γ ~1.2) extracted via the same DFSS analysis, place this CEP in the 3D Ising model universality class.

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Nuclear Particle Astrophysics (NPA) Seminar, Roy Lacey, Stony Brook University, "Indications for a Critical Point in the Phase Diagram for Hot and Dense Nuclear Matter"

WLC 108