Workshop on Modeling of the Parton-Hadron Phase Transition The Summary

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Presentation transcript:

Workshop on Modeling of the Parton-Hadron Phase Transition The Summary Zhe Xu Frankfurt Institute for Advanced Studies Sept 23-24, 2010, Villasimius, Sardinia, Italy

(Physical) Motivation Talk by Greiner, Torrieri We know that there should be a (phase) transition from partons to hadrons, confirmed by the experimental findings. for exsample: Jet quenching at RHIC indicates a deconfined phase of partons, and we observe only hadrons.

Equation of State is important for freeze-out procedures in hydrodynamical calculations. Talk by Werner, Cheng, Horvat.

Equation of State in Hydrodynamic Models hadrons, quarks, Polyakov loop and excluded volume Talk by Schramm quark, meson, baryon densities at µ = 0 natural mixed phase, quarks dominate beyond 1.5 Tc Energy density and pressure compared to lattice simulations

Lattice QCD Talk by Ratti

Probing the phase diagram Talk by Redlich Nahrgang

Lattice QCD results model calculations : To see deviations from HRG results due to deconfinement and chiral transtion one needs to measure higher order fluctuations: Lattice QCD results model calculations : C. Schmidt

(Physical) Motivation We know that there should be a (phase) transition from partons to hadrons, confirmed by the experimental findings. for exsample: Jet quenching at RHIC indicates a deconfined phase of partons, and we observe only hadrons. We do not know yet how partons hadronize. There are no first principle calculations. We have to model the parton-hadron phase transition, which is a dynamical process.

Model 1 String Model PYTHIA

Strings break to hadrons. UrQMD, GiBUU, (P)HSD, ... Strings break to (pre)hadrons in cold nuclear matter. Talk by Gallmeister. Study EMC,Hermes,CLAS with linear cross sections Strings break to Hagedron States. Talk by Beitel Strings break to partons, which leads to a bumpy spatial structure. Talk by Werner Formation of hadrons inside the QGP. Mass-Ordering in RAA. Smaller v2? Talk by Bellwied

Model 2 H Coalescence Models Talk by Greco Parton spectrum Baryon Meson Fragmentation V. Greco et al./ R.J. Fries et al., PRL 90(2003)

Coalescence carries another features … Considering only momentum space -> x - p correlation neglected narrow wave function collinear approximation Enhancement of v2 Molnar and Voloshin, PRL91 (2003) v2 for baryon is larger and saturates at higher pT GKL (PRC68) includes: Radial flow x-p correlation finite width wave function No free parameter !

convincing argument for deconfinement and formation of QGP Problems: Success: convincing argument for deconfinement and formation of QGP Problems: energy conservation non-decreasing entropy gluons only for (anti)quarks with intermediate pT ...

Model 3 Parton-Hadron-String Dynamics Talk by Cassing

Model 4 NJL Model, talk by Marty keep energy conservation and entropy growing

Model 5 Statistical Model Talk by Ferroni and Bignamini

Boltzmann algorithm: pairwise combination + separation Model 6 Non-extensive Model Talk by Biro Boltzmann algorithm: pairwise combination + separation With associative composition rule at independence: Such rules generate ‘exponential of the formal logarithm’ distribution

Outlook Models should convince us, why they are suited for describing the dynamical parton-hadron transition.

(Personal) Motivation Results from the parton cascade BAMPS (Xu&Greiner)

A naive hadronization: parallel splitting -> dE_T/dy and v2 do not change.

Coalescence We need to implement the parton-hadron transition in BAMPS.