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Search for the critical point and the onset of deconfinement

100%
Blume C.
Open Physics
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2012
|
vol. 10
|
issue 6
1245-1253
EN
A review of the current experimental situation on the search for a critical point in the QCD phase diagram and the onset of deconfinement is given. Ongoing (STAR, NA61), as well as previous (NA49) experiments are presented. Their main results up-to-now are summarized and their findings are put into a general context. The future experimental program (CBM at FAIR, MPD at NICA) is discussed as well.
2
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Search for critical fluctuations of the proton density in central A+A collisions at maximum SPS energy

100%
Antoniou N., Davis N., Diakonos F.
Open Physics
|
2012
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vol. 10
|
issue 6
1330-1332
EN
We performed an intermittency analysis of the proton density fluctuations in transverse momentum space for the collisions Si+A (A=Al,Si,P) and C+A (A=C,N) at maximum SPS energy $\sqrt {s_{NN} } $ ≈ 17 GeV). In our analysis we used exclusively proton tracks in the midrapidity region (|y CM| ≤ 0.75). For the Si+A system we find signature of power-law distributed density fluctuations quantified by the intermittency index ϕ 2 which approaches in size the predictions of critical QCD [Phys. Rev. Lett. 97, 032002 (2006)]. This result supports further the recent findings of power-law fluctuations in the density of (π +, π −) pairs with invariant mass close to their production threshold for the Si+Si at the same energy, reported in [Phys. Rev. C 81, 064907 (2010)].
3
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Probing the QCD critical point with relativistic heavy-ion collisions

100%
Bass S., Petersen H., Quammen C., Canary H., Healey C., Taylor R.
Open Physics
|
2012
|
vol. 10
|
issue 6
1278-1281
EN
We utilize an event-by-event relativistic hydrodynamic calculation performed at a number of different incident beam energies to investigate the creation of hot and dense QCD matter near the critical point. Using state-of-the-art analysis and visualization tools we demonstrate that each collision event probes QCD matter characterized by a wide range of temperatures and baryo-chemical potentials, making a dynamical response of the system to the vicinity of the critical point very difficult to isolate above the background.
4
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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
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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.
5
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Highlights of the beam energy scan from STAR

88%
Schmah A.
Open Physics
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2012
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vol. 10
|
issue 6
1238-1241
EN
The first part of the beam energy scan (BES) program at RHIC was successfully completed in the years 2010 and 2011. First STAR results from particle yield measurements are in good agreement with previously published data from SPS and AGS experiments whereas other results like azimuthal HBT and K/π event-by-event fluctuations differ at some energies. In addition, new observations like the centrality dependence of chemical freeze-out parameters (T ch and µB) or the smoothly increasing difference with decreasing energy in the elliptic flow v 2 between particles and corresponding anti-particles, are discussed.
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