Longitudinal spin polarization in a thermal model

2019
journal article
article
62
cris.lastimport.wos2024-04-09T18:21:42Z
dc.abstract.enWe use a thermal model with single freeze-out to determine longitudinal polarization of $\Lambda$ hyperons emitted from a hot and rotating hadronic medium. We consider the top RHIC energies and use the model parameters determined in the previous analyses of particle spectra and elliptic flow. Using a direct connection between the spin polarization tensor and thermal vorticity, we reproduce earlier results which indicate a quadrupole structure of the longitudinal component of the polarization three-vector with an opposite sign compared to that found in the experiment. We further use only the spatial components of the thermal vorticity in the laboratory system to define polarization and show that this leads to the correct sign and magnitude of the quadrupole structure. This procedure resembles a non-relativistic connection between the polarization three-vector and vorticity employed in other works. In general, our results bring further evidence that the spin polarization dynamics in heavy-ion collisions may be not directly related to the thermal vorticity. The additional material explains the construction of the hydrodynamically consistent gradients of fluid velocity and temperature in thermal models with the help of the perfect-fluid equations of motion.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiegopl
dc.contributor.authorFlorkowski, Wojciech - 343994 pl
dc.contributor.authorKumar, Avdheshpl
dc.contributor.authorMazeliauskas, Aleksaspl
dc.contributor.authorRyblewski, Radoslawpl
dc.date.accessioned2019-12-03T08:48:49Z
dc.date.available2019-12-03T08:48:49Z
dc.date.issued2019pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number5pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume100pl
dc.identifier.articleid054907pl
dc.identifier.doi10.1103/PhysRevC.100.054907pl
dc.identifier.eissn2469-9993pl
dc.identifier.issn2469-9985pl
dc.identifier.projectROD UJ / OPpl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/88442
dc.languageengpl
dc.language.containerengpl
dc.rightsUdzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa*
dc.rights.licenceCC-BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/legalcode.pl*
dc.share.typeinne
dc.subtypeArticlepl
dc.titleLongitudinal spin polarization in a thermal modelpl
dc.title.journalPhysical Review. Cpl
dc.typeJournalArticlepl
dspace.entity.typePublication
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