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Measurement of global polarization of Λ hyperons in few-GeV heavy-ion collisions

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dc.abstract.enThe global polarization of Λ hyperons along the total orbital angular momentum of a relativistic heavy-ion collision is presented based on the high statistics data samples collected in Au+Au collisions at sNN=2.4 GeV and Ag+Ag at 2.55 GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at GSI, Darmstadt. This is the first measurement below the strangeness production threshold in nucleon-nucleon collisions. Results are reported as a function of the collision centrality as well as a function of the hyperons transverse momentum (pT) and rapidity (yCM) for the range of centrality 0–40%. We observe a strong centrality dependence of the polarization with an increasing signal towards peripheral collisions. For mid-central (20 – 40%) collisions the polarization magnitudes are 〈PΛ〉(%)=6.8±1.3(stat.)±2.1(syst.) for Au+Au and 〈PΛ〉(%)=6.2±0.4(stat.)±0.6(syst.) for Ag+Ag, which are the largest values observed so far. This observation thus provides a continuation of the increasing trend previously observed by STAR and contrasts expectations from recent theoretical calculations predicting a maximum in the region of collision energies about 3 GeV. The observed polarization is of a similar magnitude as predicted by 3D-fluid-dynamics and the UrQMD plus thermal vorticity model and significantly above results from the AMPT model.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPiasecki, Krzysztof
dc.contributor.authorMatulewicz, Tomasz
dc.contributor.authorOrliński, Jan
dc.contributor.authorYassine, Rayane Abou
dc.contributor.authorMolenda, Aleksandra
dc.contributor.authorIDZIK, MAREK
dc.date.accessioned2024-01-25T07:58:17Z
dc.date.available2024-01-25T07:58:17Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.volume835
dc.identifier.doi10.1016/J.PHYSLETB.2022.137506
dc.identifier.issn0370-2693
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112047
dc.identifier.weblinkhttps://www.sciencedirect.com/science/article/pii/S0370269322006402
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.relation.pages137506 (6 stron)
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enheavy-ion collisions
dc.subject.enhyperons transverse momentum
dc.subject.englobal polarization
dc.titleMeasurement of global polarization of Λ hyperons in few-GeV heavy-ion collisions
dc.typeJournalArticle
dspace.entity.typePublication