Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC

The global polarization of the Λ and Λ¯ hyperons (PH) has been measured in Pb–Pb collisions at √SNN = 2.76 TeV and 5.02 TeV in ALICE at the Large Hadron Collider (LHC). The hyperon global polarization is found to be consistent with zero at both collision energies. The local polarization of the Λ and...

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Autor principal: Sarkar, Debojit
Lenguaje:eng
Publicado: EDP Sciences 2022
Materias:
Particle Physics - Experiment
Nuclear Physics - Experiment
Particle Physics - Phenomenology
Other Fields of Physics
Acceso en línea:https://dx.doi.org/10.1051/epjconf/202225906001
http://cds.cern.ch/record/2825142
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author Sarkar, Debojit
author_facet Sarkar, Debojit
author_sort Sarkar, Debojit
collection CERN
description The global polarization of the Λ and Λ¯ hyperons (PH) has been measured in Pb–Pb collisions at √SNN = 2.76 TeV and 5.02 TeV in ALICE at the Large Hadron Collider (LHC). The hyperon global polarization is found to be consistent with zero at both collision energies. The local polarization of the Λ and Λ¯ hyperons along the beam (z) direction, Pz, has also been measured in Pb–Pb collisions at √SNN = 5.02 TeV. The Pz, measured as a function of the hyperon emission angle relative to the second harmonic symmetry plane, exhibits a second harmonic sine modulation, as expected due to elliptic flow. The measurements of global and local hyperon polarization are reported for different collision centralities and as a function of transverse momentum in semicentral collisions. These results show the first experimental evidence of a non-zero hyperon Pz in Pb–Pb collisions at the LHC.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2022
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spelling cern-28251422023-06-13T14:19:23Zdoi:10.1051/epjconf/202225906001http://cds.cern.ch/record/2825142engSarkar, DebojitGlobal and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHCParticle Physics - ExperimentNuclear Physics - ExperimentParticle Physics - PhenomenologyOther Fields of PhysicsThe global polarization of the Λ and Λ¯ hyperons (PH) has been measured in Pb–Pb collisions at √SNN = 2.76 TeV and 5.02 TeV in ALICE at the Large Hadron Collider (LHC). The hyperon global polarization is found to be consistent with zero at both collision energies. The local polarization of the Λ and Λ¯ hyperons along the beam (z) direction, Pz, has also been measured in Pb–Pb collisions at √SNN = 5.02 TeV. The Pz, measured as a function of the hyperon emission angle relative to the second harmonic symmetry plane, exhibits a second harmonic sine modulation, as expected due to elliptic flow. The measurements of global and local hyperon polarization are reported for different collision centralities and as a function of transverse momentum in semicentral collisions. These results show the first experimental evidence of a non-zero hyperon Pz in Pb–Pb collisions at the LHC.The global polarization of the $\Lambda$ and $\bar\Lambda$ hyperons ($P_{\rm H}$) has been measured in Pb--Pb collisions at $\sNN=$ 2.76 TeV and 5.02 TeV in ALICE at the Large Hadron Collider (LHC). The hyperon global polarization is found to be consistent with zero at both collision energies. The local polarization of the $\Lambda$ and $\bar\Lambda$ hyperons along the beam ($z$) direction, $P_{\rm z}$, has also been measured in Pb--Pb collisions at $\sNN=5.02$ TeV. The $P_{\rm z}$, measured as a function of the hyperon emission angle relative to the second harmonic symmetry plane, exhibits a second harmonic sine modulation, as expected due to elliptic flow. The measurements of global and local hyperon polarization are reported for different collision centralities and as a function of transverse momentum in semicentral collisions. These results show the first experimental evidence of a non-zero hyperon $P_{\rm z}$ in Pb--Pb collisions at the LHC.EDP SciencesarXiv:2209.04798oai:cds.cern.ch:28251422022-09-11
spellingShingle Particle Physics - Experiment
Nuclear Physics - Experiment
Particle Physics - Phenomenology
Other Fields of Physics
Sarkar, Debojit
Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title_full Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title_fullStr Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title_full_unstemmed Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title_short Global and local polarization of $\Lambda (\overline{\Lambda})$ hyperons in Pb–Pb collisions in ALICE at the LHC
title_sort global and local polarization of $\lambda (\overline{\lambda})$ hyperons in pb–pb collisions in alice at the lhc
topic Particle Physics - Experiment
Nuclear Physics - Experiment
Particle Physics - Phenomenology
Other Fields of Physics
url https://dx.doi.org/10.1051/epjconf/202225906001
http://cds.cern.ch/record/2825142
work_keys_str_mv AT sarkardebojit globalandlocalpolarizationoflambdaoverlinelambdahyperonsinpbpbcollisionsinaliceatthelhc

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