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  1. 3 Open Physics

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  1. 3 2012

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  1. 1 Karsch F.

  2. 1 Luo X.

  3. 1 Zhu X.

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Determination of freeze-out conditions from lattice QCD calculations

100%
Karsch F.
Open Physics
|
2012
|
vol. 10
|
issue 6
1234-1237
EN
Freeze-out conditions in Heavy Ion Collisions are generally determined by comparing experimental results for ratios of particle yields with theoretical predictions based on applications of the Hadron Resonance Gas model. We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.
2
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KS0, Λ and ≡ production at intermediate to high pT from Au+Au collisions at $\sqrt {s_{NN} } $ = 39, 11.5 and 7.7 GeV

100%
Zhu X.
Open Physics
|
2012
|
vol. 10
|
issue 6
1345-1348
EN
We report on the p T dependence of nuclear modification factors (R CP) for KS0, Λ, ≡ and the $\bar NK_S^0 $ ratios at mid-rapidity from Au+Au collisions at $\sqrt {s_{NN} } $ = 39, 11.5 and 7.7 GeV. At $\sqrt {s_{NN} } $ = 39 GeV, the R CP data show a baryon/meson separation at intermediate p T and a suppression for KS0 for p T up to 4.5 GeV/c; the $\bar \Lambda K_S^0 $ shows baryon enhancement in the most central collisions. However, at $\sqrt {s_{NN} } $ = 11.5 and 7.7 GeV, R CP shows less baryon/meson separation and $\bar NK_S^0 $ shows almost no baryon enhancement. These observations indicate that the matter created in Au+Au collisions at $\sqrt {s_{NN} } $ = 11.5 or 7.7 GeV might be distinct from that created at $\sqrt {s_{NN} } $ = 39 GeV.
3
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Probing the QCD critical point by higher moments of net-proton multiplicity distributions at STAR

88%
Luo X.
Open Physics
|
2012
|
vol. 10
|
issue 6
1372-1374
EN
Higher moments (kurtosis (κ), skewness (S) and variance (σ 2)) of multiplicity distributions are sensitive to the correlation length and can be used to search for the QCD critical point. The moment products κσ 2 and S σ of net-proton distributions, which are also related to volume independent baryon number susceptibility ratios, can be compared with Lattice QCD and Hadron Resonance Gas (HRG) model calculations. We discuss the recent progress in the higher moments analysis of net-protons multiplicity distributions.
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