Polarization of Λ and ¯Λ hyperons along the beam direction in Pb-Pb collisions at √sNN=5.02 TeV
dc.contributor.author | Acharya, Shreyasi | pt_BR |
dc.contributor.author | Gay Ducati, Maria Beatriz | pt_BR |
dc.contributor.author | Pereira, Luis Gustavo | pt_BR |
dc.contributor.author | Pezzi, Rafael Peretti | pt_BR |
dc.contributor.author | ALICE Collaboration | pt_BR |
dc.date.accessioned | 2022-06-25T05:08:31Z | pt_BR |
dc.date.issued | 2022 | pt_BR |
dc.identifier.issn | 0031-9007 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/241219 | pt_BR |
dc.description.abstract | The polarization of the Λ and ¯Λ hyperons along the beam (z) direction, Pz, has been measured in Pb-Pb collisions at √sNN=5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to Pz comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient Pz,s2=[Pzsin(2φ−2Ψ2)], where φ is the hyperon azimuthal emission angle and Ψ2 is the elliptic flow plane angle. We report the measurement of Pz,s2 for different collision centralities and in the 30%–50% centrality interval as a function of the hyperon transverse momentum and rapidity. The Pz,s2 is positive similarly as measured by the STAR Collaboration in Au-Au collisions at √sNN=200 GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon Pz in Pb-Pb collisions at the LHC. The comparison of the measured Pz,s2 with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review letters. Melville. Vol. 128, no. 17 (Apr. 2022), 172005, 13 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Colisao de ions pesados | pt_BR |
dc.subject | Aceleradores de partículas | pt_BR |
dc.title | Polarization of Λ and ¯Λ hyperons along the beam direction in Pb-Pb collisions at √sNN=5.02 TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001143102 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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