Abstract
Vorticity and polarization of \(\varLambda \) and \(\bar{\varLambda }\) were calculated within the UrQMD model in non-central Au+Au collisions at energies of FAIR and NICA. To determine temperature and chemical potentials of the areas from where \(\varLambda / \bar{\varLambda }\) were emitted, the fit to statistical model of ideal hadron gas was employed. Then the thermal vorticities of the areas and polarization of both hyperons were calculated. It is found that the polarization of \(\varLambda / \bar{\varLambda }\) increases with decreasing energy of the collisions. The stronger \(\bar{\varLambda }\) polarization compared to that of \(\varLambda \) is explained by different space-time distributions and different freeze-out conditions of both hyperons.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Z. Liang, X.N. Wang, Globally polarized quark-gluon plasma in non-central A+A collisions. Phys. Rev. Lett. 94, 102301 (2005). https://doi.org/10.1103/PhysRevLett.94.102301
F. Becattini, F. Piccinini, J. Rizzo, Angular momentum conservation in heavy ion collisions at very high energy. Phys. Rev. C77, 024906 (2008). https://doi.org/10.1103/PhysRevC.77.024906
A. Sorin, O. Teryaev, Axial anomaly and energy dependence of hyperon polarization in heavy-ion collisions. Phys. Rev. C95, 011902(R) (2017). https://doi.org/10.1103/PhysRevC.95.011902
STAR Collaboration: Global \(\Lambda \) hyperon polarization in nuclear collisions: evidence for the most vortical fluid. Nature 548, 62 (2017). https://doi.org/10.1038/nature23004
S.A. Bass et al.: Microscopic models for ultrarelativistic heavy ion collisions. Prog. Part. Nucl. Phys. 41, 255 (1998). https://doi.org/10.1016/S0146-6410(98)00058-1
M. Bleicher et al., Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model. J. Phys. G25, 1859 (1999). https://doi.org/10.1088/0954-3899/25/9/308
L.V. Bravina et al., Microscopic study of freezeout in relativistic heavy ion collisions at SPS energies. Phys. Rev. C60, 044905 (1999). https://doi.org/10.1103/PhysRevC.60.044905
L. Bravina et al., The spatial sub-separation of strangeness from anti-strangeness in heavy-ion collisions at energies of FAIR and NICA. These Proceedings
L.V. Bravina et al., Local equilibrium in heavy ion collisions: Microscopic model versus statistical model analysis. Phys. Rev. C60, 024904 (1999). https://doi.org/10.1103/PhysRevC.60.024904
L.V. Bravina et al., Microscopic models and effective equation of state in nuclear collisions in the vicinity of \(E_{lab} = 30 A\) GeV at the GSI Facility for Antiproton and Ion Research (FAIR) and beyond. Phys. Rev. C78, 014907 (2008). https://doi.org/10.1103/PhysRevC.78.014907
O. Vitiuk, L. Bravina, E. Zabrodin, Different space-time freeze-out picture - an explanation of different \(\Lambda \) and \(\bar{\Lambda }\) polarization? eprint: arXiv:1910.06292 [hep-ph]
Acknowledgments
The work of L.B. and E.Z. was supported by Russian Foundation for Basic Research (RFBR) under Grants No. 18-02-40084 and No. 18-02-40085, and by the Norwegian Research Council (NFR) under grant No. 255253/F50. O.V. acknowledges the financial support of the Norwegian Centre for International Cooperation in Education (SIU) under Grant CPEA-LT-2016/10094. Computer calculations were made at Abel (UiO, Oslo) and Govorun (JINR, Dubna) computer cluster facilities.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Switzerland AG
About this paper
Cite this paper
Vitiuk, O., Bravina, L., Zabrodin, E., Sorin, A., Teryaev, O. (2020). Vorticity and \(\varLambda / \bar{\varLambda }\) Polarization in Heavy-Ion Collisions at FAIR and NICA Energies. In: Elia, D., Bruno, G.E., Colangelo, P., Cosmai, L. (eds) The XVIII International Conference on Strangeness in Quark Matter (SQM 2019). Springer Proceedings in Physics, vol 250. Springer, Cham. https://doi.org/10.1007/978-3-030-53448-6_67
Download citation
DOI: https://doi.org/10.1007/978-3-030-53448-6_67
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-53447-9
Online ISBN: 978-3-030-53448-6
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)