Centrality dependence of freeze-out parameters from Au+Au collisions at $\sqrt {s_{NN} } $ = 7.7, 11.5 and 39 GeV

• Authors: Lokesh Kumar
• Languages of publication: EN

Abstracts

EN

The RHIC beam energy scan program in its first phase collected data for Au+Au collisions at beam energies of 7.7, 11.5 and 39 GeV. The event statistics collected at these lower energies allow us to study the centrality dependence of various observables in detail, and compare to fixed-target experiments at SPS for similar beam energies. The chemical and kinetic freeze-out parameters can be extracted from the experimentally measured yields of identified hadrons within the framework of thermodynamical models. These then provide information about the system at the stages of the expansion where inelastic and elastic collisions of the constituents cease. We present the centrality dependence of freeze-out parameters for Au+Au collisions at midrapidity for $\sqrt {s_{NN} } $ = 7.7, 11.5, and 39 GeV from the STAR experiment. The chemical freeze-out conditions are obtained by comparing the measured particle ratios (involving π, K, p, and p) to those from the statistical thermal model calculations. The kinetic freeze-out conditions are extracted at these energies by simultaneously fitting the invariant yields of identified hadrons (π, K, and p) using Blast Wave model calculations.

Keywords

EN

beam energy scan; QCD phase diagram; critical point; transverse momentum spectra; chemical and kinetic freeze-out

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2012
• Volume: 10
• Issue: 6
• Pages: 1274-1277

Dates

published

1 - 12 - 2012

online

4 - 12 - 2012

Contributors

author

Lokesh Kumar

• Kent State University, Kent, OH, 44242, USA

References

• [1] B. I. Abelev et al. (STAR Collaboration), Phys. Rev. C 81, 024911 (2010) http://dx.doi.org/10.1103/PhysRevC.81.024911[Crossref]
• [2] M. M. Aggarwal et al. (STAR Collaboration), arXiv:1007.2613
• [3] L. Kumar (STAR Collaboration), Nucl. Phys. A 830, 275C (2009) http://dx.doi.org/10.1016/j.nuclphysa.2009.10.023[Crossref]
• [4] L. Kumar (STAR Collaboration), Nucl. Phys. A 862, 125 (2011) http://dx.doi.org/10.1016/j.nuclphysa.2011.05.030[Crossref]
• [5] B. Mohanty, Nucl. Phys. A 830, 899C (2009) http://dx.doi.org/10.1016/j.nuclphysa.2009.10.132[Crossref]
• [6] Y. Aoki et al., Nature 443, 675 (2006) http://dx.doi.org/10.1038/nature05120[Crossref]
• [7] S. Gupta et al., Science 332, 1525 (2011) http://dx.doi.org/10.1126/science.1204621[Crossref]
• [8] S. Ejiri, Phys. Rev. D 78, 074507 (2008) http://dx.doi.org/10.1103/PhysRevD.78.074507[Crossref]
• [9] E. S. Bowman, J. I. Kapusta, Phys. Rev. C 79, 015202 (2009) http://dx.doi.org/10.1103/PhysRevE.79.015202[Crossref]
• [10] J. Adams et al. (STAR Collaboration), Nucl. Phys. A 757, 102 (2005) http://dx.doi.org/10.1016/j.nuclphysa.2005.03.085[Crossref]
• [11] P. Braun-Munzinger et al., Phys. Lett. B 344, 43 (1995) http://dx.doi.org/10.1016/0370-2693(94)01534-J[Crossref]
• [12] J. Cleymans et al., Comput. Phys. Commun., 180, 84 (2009) http://dx.doi.org/10.1016/j.cpc.2008.08.001[Crossref]
• [13] L. Kumar (STAR collaboration), J. Phys. G Nucl. Partic. 38, 124145 (2011) http://dx.doi.org/10.1088/0954-3899/38/12/124145[Crossref]
• [14] E. Schnedermann et al., Phys. Rev. C 48, 2462 (1993) http://dx.doi.org/10.1103/PhysRevC.48.2462[Crossref]
• [15] B. I. Abelev et al. (STAR Collaboration), Phys. Rev. C 79, 034909 (2009) http://dx.doi.org/10.1103/PhysRevC.79.034909[Crossref]

Identifiers

DOI

10.2478/s11534-012-0097-9