Hyperon global polarization in isobar Ru plus Ru and Zr plus Zr collisions at root SNN=200 GeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00388938" target="_blank" >RIV/68407700:21340/25:00388938 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2025.139891" target="_blank" >https://doi.org/10.1016/j.physletb.2025.139891</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2025.139891" target="_blank" >10.1016/j.physletb.2025.139891</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hyperon global polarization in isobar Ru plus Ru and Zr plus Zr collisions at root SNN=200 GeV

Popis výsledku v původním jazyce

The polarization of Lambda, (Lambda) over bar, Xi(-), and (Xi) over bar (+) hyperons along the angular momentum of the system has been measured in isobar collisions of Ru+Ru and Zr+Zr at root S-NN = 200 GeV with the STAR detector at RHIC. The polarization dependence on collision centrality exhibits an increasing trend in more peripheral collisions.. and.<overline> polarization dependence on the transverse momentum and pseudorapidity have been investigated, but no significant dependence was observed. The polarizations of. and.<overline> are found to be consistent with each other, indicating little contribution of the spin-magnetic coupling to the measured polarization. Comparison to previously measured polarization in Au+Au collisions show no obvious system size dependence. The results are qualitatively consistent with hydrodynamic calculations including contributions from shear-induced polarization and thermal vorticity. For the first time in heavy-ion collisions, the dependence of the global polarization on the hyperon's emission azimuthal angle relative to the second-order event plane has been measured, indicating stronger polarization for the in-plane emitted hyperons at the level of 2.4 sigma significance in 20-50% centrality. The Xi hyperon polarization measurements via polarization transfer analysis yield finite positive values with 2.9 sigma significance in 20-50% centrality, slightly larger compared to the inclusive Lambda polarization.

Název v anglickém jazyce

Hyperon global polarization in isobar Ru plus Ru and Zr plus Zr collisions at root SNN=200 GeV

Popis výsledku anglicky

The polarization of Lambda, (Lambda) over bar, Xi(-), and (Xi) over bar (+) hyperons along the angular momentum of the system has been measured in isobar collisions of Ru+Ru and Zr+Zr at root S-NN = 200 GeV with the STAR detector at RHIC. The polarization dependence on collision centrality exhibits an increasing trend in more peripheral collisions.. and.<overline> polarization dependence on the transverse momentum and pseudorapidity have been investigated, but no significant dependence was observed. The polarizations of. and.<overline> are found to be consistent with each other, indicating little contribution of the spin-magnetic coupling to the measured polarization. Comparison to previously measured polarization in Au+Au collisions show no obvious system size dependence. The results are qualitatively consistent with hydrodynamic calculations including contributions from shear-induced polarization and thermal vorticity. For the first time in heavy-ion collisions, the dependence of the global polarization on the hyperon's emission azimuthal angle relative to the second-order event plane has been measured, indicating stronger polarization for the in-plane emitted hyperons at the level of 2.4 sigma significance in 20-50% centrality. The Xi hyperon polarization measurements via polarization transfer analysis yield finite positive values with 2.9 sigma significance in 20-50% centrality, slightly larger compared to the inclusive Lambda polarization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023034" target="_blank" >LM2023034: Brookhavenská národní laboratoř – účast České republiky</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics Letters B

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

870

Číslo periodika v rámci svazku

139891

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

001642065700001

EID výsledku v databázi Scopus

2-s2.0-105021051006