Observation of $\Lambda$ hyperon local polarization in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV
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203Institutions déclarées
48Pays d’affiliation déclarés
Rattachement africain : am, us, at, be, de, br, bg, cl, cn, co, hr, cy, cz, ec, Égypte, ee, fi, fr, ge, gr, hu, in, ir, ie, it, kr, kw, lv, lt, my, mx, ve, me, nz, pk, pl, pt, rs, es, lk, ch, ca, tw, th, tr, ua, gb, pr. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The polarization of the $\Lambda$ and $\overline{\Lambda}$ hyperons along the beam direction has been measured in proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of 8.16 TeV. The data were obtained with the CMS detector at the LHC and correspond to an integrated luminosity of 186.0 $\pm$ 6.5 nb$^{-1}$. A significant azimuthal dependence of the hyperon polarization, characterized by the second-order Fourier sine coefficient $P_{z,s2}$, is observed. The $P_{z,s2}$ values decrease as a function of charged particle multiplicity, but increase with transverse momentum. A hydrodynamic model that describes the observed $P_{z,s2}$ values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the pPb results. These observations pose a challenge to the current theoretical implementation of spin polarization in heavy ion collisions and offer new insights into the origin of spin polarization in hadronic collisions at LHC energies.
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Les institutions déclarées
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Alikhanyan National LaboratoryCenter for Migration Studies of New YorkInstitute of High Energy PhysicsUniversity of AntwerpVrije Universiteit BrusselUniversité Libre de BruxellesGhent University HospitalDeutsches Elektronen-Synchrotron DESYUCLouvainCentro Brasileiro de Pesquisas FísicasUniversidade do Estado do Rio de JaneiroUniversidade Federal do ABCBulgarian Academy of SciencesSofia University "St. Kliment Ohridski"University of TarapacáBeihang UniversityTsinghua UniversityPeking UniversitySouth China Normal UniversityUniversity of Science and Technology of ChinaNanjing Normal UniversityShandong UniversityFudan UniversityInstitute of Modern PhysicsZhejiang UniversityUniversidad de AntioquiaUniversity of SplitRuđer Bošković InstituteUniversity of CyprusCharles UniversityNational Polytechnic SchoolUniversidad San Francisco de QuitoAcademy of Scientific Research and TechnologyFayoum UniversityNational Institute of Chemical Physics and BiophysicsUniversity of HelsinkiHelsinki Institute of PhysicsLappeenranta-Lahti University of TechnologyCommissariat à l'Énergie Atomique et aux Énergies AlternativesUniversité Paris-SaclayCEA Paris-SaclayInstitut de Recherche sur les Lois Fondamentales de l'UniversLaboratoire Leprince-RinguetUniversité de Haute-AlsaceInstitut Pluridisciplinaire Hubert CurienUniversité de StrasbourgCentre de Calcul de l’Institut National de Physique Nucléaire et de Physique des ParticulesInstitute of Nuclear Physics of LyonInstitut de Physique des 2 Infinis de LyonGeorgian Technical UniversityRWTH Aachen UniversityUniversität HamburgInstitute of Nuclear and Particle PhysicsNational and Kapodistrian University of AthensNational Technical University of AthensUniversity of IoanninaHUN-REN Wigner Research Centre for PhysicsEötvös Loránd UniversityUniversity of DebrecenHUN-REN Institute for Nuclear ResearchPanjab UniversityUniversity of DelhiSaha Institute of Nuclear PhysicsTata Institute of Fundamental ResearchNational Institute of Science Education and ResearchIndian Institute of Science Education and Research KolkataIndian Institute of Science Education and Research MohaliIndian Institute of Science Education and Research, BhopalIndian Institute of Science Education and Research BerhampurIndian Institute of Science Education and Research, TirupatiIsfahan University of TechnologyInstitute for Research in Fundamental SciencesUniversity College DublinIstituto Nazionale di Fisica Nucleare, Sezione di BariUniversity of Bari Aldo MoroPolytechnic University of BariIstituto Nazionale di Fisica Nucleare, Sezione di BolognaUniversity of BolognaUniversity of CataniaIstituto Nazionale di Fisica Nucleare, Sezione di CataniaIstituto Nazionale di Fisica Nucleare, Sezione di FirenzeUniversity of FlorenceIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIstituto Nazionale di Fisica Nucleare, Sezione di GenovaUniversity of GenoaIstituto Nazionale di Fisica Nucleare, Sezione di Milano BicoccaUniversity of Milano-BicoccaIstituto Nazionale di Fisica Nucleare, Sezione di NapoliUniversity of Naples Federico IIUniversity of BasilicataIstituto Nazionale di Fisica Nucleare, Sezione di PadovaUniversity of PaduaIstituto Nazionale di Fisica Nucleare, Sezione di PaviaUniversity of PaviaUniversity of PerugiaIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaIstituto Nazionale di Fisica Nucleare, Sezione di PisaScuola Normale SuperioreUniversity of PisaUniversity of SienaIstituto Nazionale di Fisica Nucleare, Sezione di Roma ISapienza University of RomeIstituto Nazionale di Fisica Nucleare, Sezione di TorinoUniversity of TurinUniversità degli Studi del Piemonte Orientale “Amedeo Avogadro”University of TriesteIstituto Nazionale di Fisica Nucleare, Sezione di TriesteKyungpook National UniversityChonnam National University HospitalHanyang UniversityKyung Hee UniversitySejong UniversitySeoul National UniversityUniversity of SeoulYonsei UniversitySungkyunkwan UniversityAmerican University of the Middle EastKuwait UniversityRiga Technical UniversityUniversity of LatviaVilnius UniversityUniversity of MalayaUniversidad de SonoraInstituto de Estudios AvanzadosInstituto Politécnico NacionalIbero American UniversityBenemérita Universidad Autónoma de PueblaUniversity of MontenegroUniversity of CanterburyQuaid-i-Azam UniversityJagiellonian UniversityAGH University of KrakowNational Centre for Nuclear ResearchUniversity of WarsawWarsaw University of TechnologyLIP - Laboratory of Instrumentation and Experimental Particle PhysicsUniversity of BelgradeCentro de Investigaciones Energéticas, Medioambientales y TecnológicasUniversidad Autónoma de MadridUniversidad de CantabriaUniversity of ColomboUniversity of RuhunaETH ZurichInstitute of Particle PhysicsUniversity of ZurichNational Central UniversityLaboratoire d’Annecy de Physique des ParticulesNational Taiwan UniversityChulalongkorn UniversityCukurova UniversityMiddle East Technical UniversityBoğaziçi UniversityIstanbul Technical UniversityIstanbul UniversityYıldız Technical UniversityInstitute for Scintillation MaterialsKharkiv Institute of Physics and TechnologyUniversity of BristolRutherford Appleton LaboratoryImperial Valley CollegeBrunel University of LondonBaylor UniversityCatholic University of AmericaUniversity of AlabamaBrown UniversityUniversity of California SystemCalifornia Institute of TechnologyCarnegie Mellon UniversityUniversity of Colorado BoulderUniversity of Colorado SystemCornell UniversityFermi National Accelerator LaboratoryUniversity of FloridaFlorida State UniversityFlorida Institute of TechnologyUniversity of Illinois ChicagoUniversity of IowaJohns Hopkins UniversityUniversity of KansasKansas State UniversityUniversity of Maryland, College ParkMassachusetts Institute of TechnologyUniversity of Minnesota SystemUniversity of Nebraska–LincolnUniversity at Buffalo, State University of New YorkUniversidad del NoresteUniversity of Notre DameThe Ohio State UniversityPrinceton UniversityUniversity of Puerto Rico SystemPurdue University West LafayettePurdue University NorthwestRice UniversityUniversity of RochesterRutgers, The State University of New JerseyUniversity of Tennessee at KnoxvilleMitchell InstituteTexas A&M UniversityTexas Tech UniversityVanderbilt UniversityUniversity of VirginiaWayne State UniversityUniversity of Wisconsin–Madison
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Les sujets associés
High-Energy Particle Collisions ResearchParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle Interactions