Indications for a Critical End Point in the Phase Diagram for Hot and Dense Nuclear Matter

Lacey, Roy A.

doi:10.1103/PhysRevLett.114.142301

Title: Indications for a Critical End Point in the Phase Diagram for Hot and Dense Nuclear Matter

Journal Article · Mon Apr 06 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.142301· OSTI ID:1598592

Lacey, Roy A. ^[1]

Stony Brook Univ., NY (United States)

Here, excitation functions for the Gaussian emission source radii difference ( $R_{out}^{2} - R_{side}^{2}$ ) obtained from two-pion interferometry measurements in $Au + Au$ ( $\sqrt{s_{N N}} = 7.7 - 200 GeV$ ) and $Pb + Pb$ ( $\sqrt{s_{N N}} = 2.76 TeV$ ) collisions are reported on for a broad range of collision centralities. The observed nonmonotonic excitation functions validate the finite-size scaling patterns expected for the deconfinement phase transition and the critical end point (CEP), in the temperature versus baryon chemical potential ( $T, μ_{B}$ ) plane of the nuclear matter phase diagram. A finite-size scaling (FSS) analysis of these data suggests a second order phase transition with the estimates $T^{cep} ~ 165 MeV$ and $μ_{B}^{cep} ~ 95 MeV$ for the location of the critical end point. The critical exponents ( $ν \approx 0.66$ and $γ \approx 1.2$ ) extracted via the same FSS analysis place this CEP in the 3D Ising model universality class.

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Research Organization:: Stony Brook Univ., NY (United States); State Univ. of New York (SUNY), Syracuse, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-87ER40331

OSTI ID:: 1598592

Alternate ID(s):: OSTI ID: 1179322

Journal Information:: Physical Review Letters, Vol. 114, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 74 works

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