Probing the QCD phase structure using event-by-event fluctuations
arXiv:2008.04643 · doi:10.1088/1742-6596/1602/1/012003
Abstract
Heavy-ion collisions at relativistic energies probe matter at extreme conditions of temperatures and energy densities. The study of event-by-event fluctuations of experimental observables is crucial to probe the QCD phase transition, locate the critical point, and learn about the associated critical phenomena. At the critical point, all thermodynamic quantities behave anomalously. Fluctuation measurements provide access to thermodynamic response functions. We discuss the methods for obtaining the isothermal compressibility using particle multiplicity fluctuation, and specific heat using fluctuations in mean transverse momentum, temperature, and energy. Lattice QCD calculations have predicted non-monotonic behavior in the higher-order cumulants of conserved quantities at the critical point. Fluctuations in the multiplicity of charged to neutral particles have been measured to understand the formation of domains of disoriented chiral condensates. We review the recent fluctuation results as a function of collision centrality and energy from experiments at SPS, RHIC, and LHC. In addition, we propose to map the temperature fluctuations in eta-phi plane to probe local fluctuations of temperature and energy density.
arXiv commentTo appear in the proceedings of WWND 2020 conference, 12 pages, 14 figures
References in corpus (27)
- The order of the quantum chromodynamics transition predicted by the standard model of particle physics
- The phase diagram of dense QCD
- Event-by-Event Fluctuations in Heavy Ion Collisions and the QCD Critical Point
- Non-Gaussian fluctuations near the QCD critical point
- Static and Dynamic Critical Phenomena at a Second Order QCD Phase Transition
- Mapping the Phases of Quantum Chromodynamics with Beam Energy Scan
- Canonical partition function and finite density phase transition in lattice QCD
- QCD phase diagram and the critical point
- Lattice QCD and heavy ion collisions: a review of recent progress
- Event-by-event hydrodynamics and elliptic flow from fluctuating initial state
- Using Higher Moments of Fluctuations and their Ratios in the Search for the QCD Critical Point
- Event-by-event physics in relativistic heavy ion collisions
- Collision Energy Dependence of Moments of Net-Kaon Multiplicity Distributions at RHIC
- When can long-range charge fluctuations serve as a QGP signal?
- Fluctuations, strangeness and quasi-quarks in heavy-ion collisions from lattice QCD
- Causal Diffusion and the Survival of Charge Fluctuations in Nuclear Collisions
- Hadronic matter compressibility from event-by-event analysis of heavy-ion collisions
- Search for Disoriented Chiral Condensates in 158 AGeV Pb+Pb Collisions
- Formation of droplets with high baryon density at the QCD phase transition in expanding matter
- Collision energy dependence of second-order off-diagonal and diagonal cumulants of net-charge, net-proton and net-kaon multiplicity distributions in Au+Au collisions
- Hadronic fluctuations in the QGP
- Baryonic Strangeness and Related Susceptibilities in QCD
- Characterization of initial fluctuations for the hydrodynamical description of heavy ion collisions
- Specific Heat of Matter Formed in Relativistic Nuclear Collisions
- Isothermal compressibility of hadronic matter formed in relativistic nuclear collisions
- Present Status and Future of DCC Analysis
- Modeling of Charged-Neutral Kaon Fluctuations as a Signature of DCC Production in A--A Collisions