Neutral strange hadron production in heavy ion collisions at energies √Snn = 8,7−17,3 Gev

  • Valeriy Kizka National Science Center «Kharkov Institute of Physics and Technology» https://orcid.org/0000-0003-1007-5295
  • Alexander Korchin National Science Center «Kharkov Institute of Physics and Technology» https://orcid.org/0000-0001-7947-170X
  • Victor Trubnikov National Science Center «Kharkov Institute of Physics and Technology»
Keywords: neutral strange hadrons, nuclear modification factor, parton degree of freedom

Abstract

The data on the yield of neutral strange hadrons at the collisions of heavy ions(Au+Au, Pb+Pb) at energies √Snn  = 8,7−17,3 GeV are presented. The ratios of yields of the neutral strange hadrons Λ0/KS0 are compared for the different centrality collisions of heavy ions. The nuclear modification factor RCP as function of transverse momentum for different colliding energies is investigated. The experimental results for Au+Au collisions at energy √Snn  = 9,2 GeV are compared with the different theoretical models (UrQMD2.3, EPOS1.67, HIJING1.7), describing the dynamics of processes of heavy ions collision. It was shown that the model UrQMD2.3, describing heavy ion collisions without using partonic degrees of freedom being created in area of heavy ion interaction, gives better agreement with experimental data than the models EPOS1.67 and HIJING1.7 that use the partonic degrees of freedom.

Downloads

Download data is not yet available.

References

Bedangadas Mohanty (for the STAR Collaboration). STAR experiment results from the beam energy scan program at RHIС // arXiv:1106.5902 [nucl-ex].

Hohne C. SPS energy scan results and physics prospects at FAIR // Nucl. Phys. A – 2009. – Vol. 830. – P. 369C-376C.

Alt C. et al. (NA49 Collaboration). Pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement // Phys. Rev. C – 2008. – Vol. 77. – P. 024903-1 – 024903-10.

Tounsi A., Redlich K. Strangeness Enhancement and Canonical Suppression // arXiv:0111159 [hep-ph].

Alt C. et al., (NA49 Collaboration). Energy dependence of Lambda and Xi production in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV measured at the CERN Super Proton Synchrotron // Phys. Rev. C – 2008. – Vol. 78. – P. 034918-1 – 034918-15.

Bormann C. (for NA49 Collaboration). Kaon-, Λ- and anti-Λ-production in Pb + Pb-collisions at 158 GeV per nucleon // J. Phys. G: Nucl. Part. Phys. – 1997. – Vol. 23. – P. 1817-1825.

Antinori F. et al. (NA57 Collaboration). Study of the transverse mass spectra of strange particles in Pb-Pb collisions at 158 A GeV/c // J. Phys. G: Nucl. Part. Phys. – 2004. – Vol. 30. – P. 823-840.

Antinori F. et al. (NA57 Collaboration). Transverse dynamics of Pb–Pb collisions at 40 A GeV/c viewed by strange hadrons // J. Phys. G: Nucl. Part. Phys. – 2006. – Vol. 32. – P. 2065-2080.

Hwa R.C. and Yang C.B. Inclusive distributions for hadronic collisions in the valon-recombination model // Phys. Rev. C – 2002. – Vol. 66. – P. 025205-1 – 025205-11; Greco V., Ko C.M. and Levai P. Parton Coalescence and the Antiproton/Pion Anomaly at RHIC // Phys. Rev. Lett. – 2003. – Vol. 90. – P. 202302-1 – 202302-4; Fries R..,Muller B., Nonaka C., Bass S.A. Hadronization in Heavy - Ion Collisions : Recombination and Fragmentation of Partons // Phys. Rev. Lett. – 2003. – Vol. 90. – P. 202303-1 – 202303-4; Molnar D., Voloshin S.A. Elliptic Flow at Large Transverse Momenta from Quark Coalescence // Phys. Rev. Lett. – 2003. – Vol. 91. – P. 092301-1 – 092301-4.

Laszlo A., Schuster T. (for NA49 Collaboration). High Spectra of Identified Particles Produced in Pb+Pb Collisions at 158 GeV/nucleon Beam Energy // Nuclear Physics A. – 2006. – Vol. 774. – P. 473-476.

Helstrup H. (for NA57 Collaboration). Results from NA57 //J. Phys. G: Nucl. Part. Phys. – 2006. – Vol. 32. – P. S89-S95.

Bass S.A., Belkacem M., Bleicher M. et al. Microscopic models for ultrarelativistic heavy ion collisions // Prog. Part. Nucl. Phys. – 1998. –Vol. 41. – P. 225-370.

Barbashov B.M., Nesterenko V.V. Model' relyativistskoy struny v fizike adronov. - M.: Energoatomizdat, 1987. – 185 s.

Xin-Nian Wang and Miklos Gyulassy. HIJING: A Monte Carlo model for multiple jet production in pp, pA, and AA collisions // Phys. Rev. D – 1991. – Vol. 44. – P. 3501-1 – 3501-15; Miklos Gyulassy and Xin-Nian Wang. HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions // Comput. Phys. Commun. – 1994. – Vol. 83. – P. 307-331.

Werner K. The hadronic interaction model EPOS // Nuclear Physics B (Proc. Suppl.). – 2008. – Vol. 175–176. – P. 81-87.

Published
2013-06-01
Cited
How to Cite
Kizka, V., Korchin, A., & Trubnikov, V. (2013). Neutral strange hadron production in heavy ion collisions at energies √Snn = 8,7−17,3 Gev. East European Journal of Physics, (1059(3), 22-28. Retrieved from https://periodicals.karazin.ua/eejp/article/view/12921