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Baryon and electric charge fluctuations at crossover

100%
Skokov V.
Open Physics
|
2012
|
vol. 10
|
issue 6
1375-1378
EN
We discuss the higher order cumulants of net-baryon and electric charge fluctuations as a probe of the QCD crossover. The sensitivity of the higher order cumulants in the hadron resonance gas model to an inclusion of repulsive interactions is also considered.
2
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Dynamical approach to spectator fragmentation in Au+Au reactions at 35 MeV/A

100%
Vermani Y., Puri R.
Open Physics
|
2011
|
vol. 9
|
issue 3
621-627
EN
The characteristics of fragment emission in peripheral 197Au+197Au collisions 35 MeV/A are studied using the two clusterization approaches within framework of quantum molecular dynamics model. Our model calculations using minimum spanning tree (MST) algorithm and advanced clusterization method namely simulated annealing clusterization algorithm (SACA) showed that fragment structure can be realized at an earlier time when spectators contribute significantly toward the fragment production even at such a low incident energy. Comparison of model predictions with experimental data reveals that SACA method can nicely reproduce the fragment charge yields and mean charge of the heaviest fragment. This reflects suitability of SACA method over conventional clusterization techniques to investigate spectator matter fragmentation in low energy domain.
3
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Multi-strange baryon elliptic flow in Pb-Pb collisions at $\sqrt {s_{NN} } $ = 2.76 TeV measured with the ALICE detector

100%
Yin Z.
Open Physics
|
2012
|
vol. 10
|
issue 6
1361-1364
EN
We present the results on elliptic flow with multi-strange baryons produced in Pb-Pb collisions at $\sqrt {s_{NN} } $ = 2.76 TeV. The analysis is performed with the ALICE detector at LHC. Multi-strange baryons are reconstructed via their decay topologies and the v 2 measurements are analyzed with the two-particle scalar product method. The p T differential v 2 values are compared to the viscous hydrodynamical (VISH2+1) model calculation and to the STAR measurements in Au-Au collisions at $\sqrt {s_{NN} } $ = 200 GeV. We found that the model describes ≡ and Ωv 2 measurements within uncertainties. The differential v 2 of ≡ and Ω is similar to the STAR measurements at 200 GeV in Au-Au collisions.
4
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Di-lepton production in heavy-ion collisions and the QCD phase diagram

100%
Zhang Y., Xu H., Zha W., Wang Q.
Open Physics
|
2012
|
vol. 10
|
issue 6
1352-1356
EN
We reproduce di-electron spectra in the region of 0 < m e+e < 4 GeV in both minimum bias and central Au+Au collisions at $\sqrt {s_{NN} } $ = 200 GeV measured by the STAR experiment. A cocktail simulation, incorporating STAR acceptance and detector responses, is able to describe the “enhancement” of the low mass region by including an in-medium modification of vector mesons and a thermal di-lepton calculation. We also predict the di-lepton mass spectra in RHIC lower energies via an extrapolation method. The evolution of Di-lepton mass spectra, effective temperature, and possible medium modifications versus colliding energies are studied to explore the QCD phase diagram.
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