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Transport Model Approach to Λ and Λ¯ Polarization in Heavy-Ion Collisions
- Source :
- Symmetry, Volume 13, Issue 10, Symmetry, Vol 13, Iss 1852, p 1852 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- This paper investigates the symmetry breaking between the polarizations of Λ and Λ¯ hyperons in relativistic collisions of heavy ions at intermediate and low energies. The microscopic transport model UrQMD is employed to study the thermal vorticity of hot and dense nuclear matter formed in non-central Au + Au collisions at center-of-mass energies 7.7≤sNN≤62.4 GeV. The whole volume of an expanding fireball is subdivided into small cubic cells. Then, we trace the final Λ and Λ¯ hyperons back to their last interaction point within a certain cell. Extracting the bulk parameters, such as energy density, net baryon density, and net strangeness of the hot and dense medium in the cell, one can obtain the cell temperature and the chemical potentials at the time of the hyperon emission. To do this, the extracted characteristics have to be fitted to the statistical model (SM) of ideal hadron gas. After that, the vorticity of nuclear matter and polarization of both hyperons are calculated. We found that the polarization of both Λ and Λ¯ increases with decreasing energy of heavy-ion collisions. The stronger polarization of Λ¯ is explained by (i) the slightly different freeze-out conditions of both hyperons and (ii) the different space–time distributions of Λ and Λ¯.
- Subjects :
- Physics
Physics and Astronomy (miscellaneous)
General Mathematics
Hadron
Nuclear Theory
MathematicsofComputing_GENERAL
Hyperon
transport models
Vorticity
Strangeness
Nuclear matter
Polarization (waves)
Ion
Nuclear physics
TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES
Chemistry (miscellaneous)
QA1-939
Computer Science (miscellaneous)
polarization of hyperons
thermal vorticity
Symmetry breaking
Nuclear Experiment
Mathematics
relativistic heavy-ion collisions
Subjects
Details
- Language :
- English
- ISSN :
- 20738994
- Database :
- OpenAIRE
- Journal :
- Symmetry
- Accession number :
- edsair.doi.dedup.....31d217bb6bcdbb521c611d917975cfbd
- Full Text :
- https://doi.org/10.3390/sym13101852