{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.99054.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1672785"}},{"@id":"https://doi.org/10.1103/PhysRevC.98.014910","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2021","description":"Global polarization of $\\Lambda$ hyperons has been measured to be of the order of a few tenths of a percent in Au+Au collisions at $\\sqrt{s_{_{NN}}}$ = 200 GeV, with no significant difference between $\\Lambda$ and $\\bar{\\Lambda}$. These new results reveal the collision energy dependence of the global polarization together with the results previously observed at $\\sqrt{s_{_{NN}}}$ = 7.7 - 62.4 GeV and indicate noticeable vorticity of the medium created in non-central heavy-ion collisions at the highest RHIC collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from the AMPT (A Multi-Phase Transport) model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity $\\eta^H$ within $|\\eta^H|<1$.  An indication of the polarization dependence on the event-by-event charge asymmetry is observed at the $2\\sigma$ level, suggesting a possible contribution to the polarization from the axial current induced by the initial magnetic field. ***Updated polarization values using the new $\\alpha_\\Lambda=0.732$ published on PDG2020 are also presented in this HEPData entry.***","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t1","@type":"Dataset","description":"Global polarization of $\\Lambda$ and $\\bar{\\Lambda}$ as a function of the collision energy $\\sqrt{s_{_{NN}}}$ for 20-50% centrality Au+Au collisions. Thin...","name":"Figure 4"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t2","@type":"Dataset","description":"$\\Lambda$ ($\\bar\\Lambda$) polarization as a function of the collision centrality in Au+Au collisions at $\\sqrt{s_{NN}} = 200$ GeV. Open boxes...","name":"Figure 5"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t3","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ as a function of $p_{T}$ for the $20\\%\u201360\\%$ centrality bin in Au+Au collisions at $\\sqrt{s_{NN}}...","name":"Figure 6"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t4","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ as a function of $\\eta$ for the $20\\%\u201360\\%$ centrality bin in Au+Au collisions at $\\sqrt{s_{NN}}...","name":"Figure 7"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t5","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ as a function of observed charge asymmetry $A_{ch}$ normalized with its RMS $\\sigma_{A_{ch}}$ for the...","name":"Figure 8"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t6","@type":"Dataset","description":"Global polarization of $\\Lambda$ and $\\bar{\\Lambda}$ using the new $\\alpha_\\Lambda=0.732$ updated on PDG2020 as a function of the collision energy...","name":"Figure 4 with New $\\alpha$"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t7","@type":"Dataset","description":"$\\Lambda$ ($\\bar\\Lambda$) polarization using the new $\\alpha_\\Lambda=0.732$ updated on PDG2020 as a function of the collision centrality in Au+Au collisions...","name":"Figure 5 with New $\\alpha$"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t8","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ using the new $\\alpha_\\Lambda=0.732$ updated on PDG2020 as a function of $p_{T}$ for the $20\\%\u201360\\%$...","name":"Figure 6 with New $\\alpha$"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t9","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ using the new $\\alpha_\\Lambda=0.732$ updated on PDG2020 as a function of $\\eta$ for the $20\\%\u201360\\%$...","name":"Figure 7 with New $\\alpha$"},{"@id":"https://doi.org/10.17182/hepdata.99054.v2/t10","@type":"Dataset","description":"Polarization of $\\Lambda$ and $\\bar\\Lambda$ using the new $\\alpha_\\Lambda=0.732$ updated on PDG2020 as a function of observed charge asymmetry $A_{ch}$...","name":"Figure 8 with New $\\alpha$"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1672785?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/99054"}],"inLanguage":"en","name":"Global polarization of $\\Lambda$ hyperons in Au+Au collisions at $\\sqrt{s_{_{NN}}}$ = 200 GeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1672785?version=2","version":2}