2005/04/06 by Edward Shuryak, E. Shuryak, Shuryak, E.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0504048
arxiv created 2005/04/06 · openalex publication_date 2005/04/06 · openalex created_date 2016/06/24 · arxiv updated 2016/09/06 · openalex updated_date 2026/07/28
The QCD (tri)critical point, a genuine second-order phase transition, implies existence of a massless scalar mode, and singular behavior near it. In this work we however focus on the finite region around it, defined by a condition mσ=2mπ. We point out that in this region the inter-hadron interaction should be dramatically changed. Light sigma should increase attractive mean field potentials for baryons and non-Goldstone mesons. The same effect can be observed in additional downward shift of the mass of vector mesons ρ,ω,ϕ, accessible via dilepton experiments. For pions we predict that the mean change due to light sigma is in fact a repulsive mean potential. The implications of these effects for collective pion and nucleon flows, radial directed and elliptic, are estimated. Finally, we speculate tha unusual behavior of flows observed by NA49 at 40 GeV PbPb collisions at SPS may be explained by location of the critical point region nearby.