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Observation of (Formula presented) Hyperon Local Polarization in (Formula presented)-Pb Collisions at (Formula presented)

ArticleAçık Erişim

Özet

The polarization of the (Formula presented) and (Formula presented) hyperons along the beam direction has been measured in proton-lead ((Formula presented)) 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 (Formula presented). A significant azimuthal dependence of the hyperon polarization, characterized by the second-order Fourier sine coefficient (Formula presented), is observed. The (Formula presented) values decrease as a function of charged particle multiplicity, but increase with transverse momentum. A hydrodynamic model that describes the observed (Formula presented) values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the (Formula presented) 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. © 2025 CERN, for the CMS Collaboration.

Anahtar Kelimeler

AstrophysicsHeavy ionsParticle detectorsTellurium compoundsA-centerAzimuthal dependenceBeam directionCenter-of-mass energiesCentre-of-mass energiesCMS detectorsHyperon polarizationIntegrated luminosityLocal polarizationSpin-polarizationarticlepolarizationSpin polarization
RDL Kalıcı Bağlantı (PID)
https://rdlopen.rawdatalibrary.net/r/ebyu/10779Resmi atıflarda kullanılan kalıcı adres
DOI
https://doi.org/10.1103/6ywq-gm61Yayıncı resmi DOI adresi
Tam Kayıt
AlanDeğerDil
dc.contributor.authorHayrapetyan, A.
dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorAndrejkovic, J.W.
dc.contributor.authorBenato, L.
dc.contributor.authorBergauer, T.
dc.contributor.authorChatterjee, S.
dc.contributor.authorDamanakis, K.
dc.contributor.authorDragicevic, M.
dc.contributor.authorHussain, P.S.
dc.contributor.authorJeitler, M.
dc.contributor.authorKrammer, N.
dc.contributor.authorLi, A.
dc.contributor.authorLiko, D.
dc.contributor.authorMikulec, I.
dc.contributor.authorSchieck, J.
dc.contributor.authorSchöfbeck, R.
dc.contributor.authorSchwarz, D.
dc.contributor.authorSonawane, M.
dc.contributor.authorWaltenberger, W.
dc.contributor.authorWulz, C.-E.
dc.contributor.authorJanssen, T.
dc.contributor.authorVan Laer, T.
dc.contributor.authorVan Mechelen, P.
dc.contributor.authorBreugelmans, N.
dc.contributor.authorD’Hondt, J.
dc.contributor.authorDansana, S.
dc.contributor.authorDe Moor, A.
dc.contributor.authorDelcourt, M.
dc.contributor.authorHeyen, F.
dc.contributor.authorLowette, S.
dc.contributor.authorMakarenko, I.
dc.contributor.authorMüller, D.
dc.contributor.authorTavernier, S.
dc.contributor.authorTytgat, M.
dc.contributor.authorVan Onsem, G.P.
dc.contributor.authorVan Putte, S.
dc.contributor.authorVannerom, D.
dc.contributor.authorBilin, B.
dc.contributor.authorClerbaux, B.
dc.contributor.authorDas, A.K.
dc.contributor.authorDe Bruyn, I.
dc.contributor.authorDe Lentdecker, G.
dc.contributor.authorEvard, H.
dc.contributor.authorFavart, L.
dc.contributor.authorGianneios, P.
dc.contributor.authorJaramillo, J.
dc.contributor.authorKhalilzadeh, A.
dc.contributor.authorKhan, F.A.
dc.contributor.authorLee, K.
dc.date.accessioned2026-10-18T20:25:55.203189242Z
dc.date.available2026-10-18T20:25:55.203189242Z
dc.date.issued2025
dc.description.abstractThe polarization of the (Formula presented) and (Formula presented) hyperons along the beam direction has been measured in proton-lead ((Formula presented)) 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 (Formula presented). A significant azimuthal dependence of the hyperon polarization, characterized by the second-order Fourier sine coefficient (Formula presented), is observed. The (Formula presented) values decrease as a function of charged particle multiplicity, but increase with transverse momentum. A hydrodynamic model that describes the observed (Formula presented) values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the (Formula presented) 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. © 2025 CERN, for the CMS Collaboration.
dc.description.sponsorshipWe congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid and other centers for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies:SC (Armenia); BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); ERC PRG, RVTT3, and MoER TK202 (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); SRNSF (Georgia); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LMTLT (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MES and NSC (Poland); FCT (Portugal); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); MHESI and NSTDA (Thailand); TUBITAK and TENMAK (Turkey); NASU (Ukraine); STFC (United Kingdom); and DOE and NSF (USA).
dc.identifier.doi10.1103/6ywq-gm61
dc.identifier.issn0031-9007
dc.identifier.issue13
dc.identifier.pmid41076707
dc.identifier.scopus2-s2.0-105018527440
dc.identifier.startpage132301
dc.identifier.urihttps://rdlopen.rawdatalibrary.net/r/ebyu/10779
dc.identifier.volume135
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review Letters
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAstrophysics
dc.subjectHeavy ions
dc.subjectParticle detectors
dc.subjectTellurium compounds
dc.subjectA-center
dc.subjectAzimuthal dependence
dc.subjectBeam direction
dc.subjectCenter-of-mass energies
dc.subjectCentre-of-mass energies
dc.subjectCMS detectors
dc.subjectHyperon polarization
dc.subjectIntegrated luminosity
dc.subjectLocal polarization
dc.subjectSpin-polarization
dc.subjectarticle
dc.subjectpolarization
dc.subjectSpin polarization
dc.titleObservation of (Formula presented) Hyperon Local Polarization in (Formula presented)-Pb Collisions at (Formula presented)
dc.typeArticle
dspace.entity.typePublication
rdl.citation.scopus6
rdl.oa.statusgold
rdl.source.indexSCOPUS