Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA. Search for signals of Phase Transition in Au + Au collisions at √s NN = 3 – 9 GeV Motivation
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-2 < η < 2
-1 < η < 1
Table: Marked hyperons are accessible through their decays into charged hadrons
Λ → pπ-
Ξ- → Λπ- → pπ- π-
Ω- → ΛK- → pK- π-
T – inverse slope
Measured scaled variances are close to the Poisson one – close to 1!
No sign of increased fluctuations as expected for a freezeout
near the critical point of strongly interacting matter was observed.
To exclude trivial fluctuations from consideration the following variable is used:
For the system of independently emitted particles (no inter-particle
correlations) Фpt goes to zero.
Directed flow v collisions (b < 3fm)1 & elliptic flow v2
Non-central Au+Au collisions:
Interactions between constituents leads to a pressure gradients => spartial asymmetry is converted in asymmetry in momentum space => collective flows
- directed flow
V2>0 indicates in-plane emission of particles
V2<0 corresponds to out-of-plane emission (squeeze-out perpendicular to the reaction plane)
- elliptic flow
HBT collisions (b < 3fm)interferometry
Gaussian model (3-d):
New simulation codes which take into accountphase transitions of deconfinement and/or chiral symmetry restoration are needed.