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New phases of QCD, the tricritical point, and RHIC as a ``nutcracker''

1999/03/09 by Edward Shuryak, Shuryak, E. V.
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ph/9903297

openalex publication_date 1999/03/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Because too many interesting things are going on now, I have tried to squeeze three different subjects into one talk. The first is a brief summary of the color super-conductivity. During the last year we learned that instanton-induced forces can not only break chiral symmetry in the QCD vacuum, but also create correlated scalar diquarks and form new phases,some similar to the Higgs phase of the Standard model. The second issue I discuss is the remnant of the so called tricritical point, which in QCD with physical masses is the endpoint of the first order transition. I will argue that exchange of sigmas (which are massless at this point even with quark masses included) create interesting event-by-event fluctuations, which can be used to locate it. Finally I describe first results on flow calculations for non-central collisions at RHIC. It was found that it is extremely sensitive to Equation of State (EOS). Furthermore, the unusual ``nutcracker'' picture emerges for lattice-motivated EOS, which is formation of two shells which are physically separated before the freeze-out.

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