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Observation of a new Ξb baryon

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The observation of a new b baryon via its strong decay into Ξb-π+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at √s=7TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3fb -1. The known Ξb- baryon is reconstructed via the decay chain Ξb-→J/ψΞ-→μ+μ -Λ0π-, with Λ0→pπ-. A peak is observed in the distribution of the difference between the mass of the Ξb-π+ system and the sum of the masses of the Ξb- and π+, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14.84±0.74(stat)±0.28(syst)MeV. The new state most likely corresponds to the JP=3/2+ companion of the Ξb. © 2012 CERN.

Anahtar Kelimeler

Charge conjugateData sampleDecay chainsIntegrated luminosityMass differenceMost likelyStandard deviation
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AlanDeğerDil
dc.contributor.authorChatrchyan, S.
dc.contributor.authorKhachatryan, V.
dc.contributor.authorSirunyan, A.M.
dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorBergauer, T.
dc.contributor.authorDragicevic, M.
dc.contributor.authorErö, J.
dc.contributor.authorFabjan, C.
dc.contributor.authorFriedl, M.
dc.contributor.authorFrühwirth, R.
dc.contributor.authorGhete, V.M.
dc.contributor.authorHammer, J.
dc.contributor.authorHörmann, N.
dc.contributor.authorHrubec, J.
dc.contributor.authorJeitler, M.
dc.contributor.authorKiesenhofer, W.
dc.contributor.authorKnünz, V.
dc.contributor.authorKrammer, M.
dc.contributor.authorLiko, D.
dc.contributor.authorMikulec, I.
dc.contributor.authorPernicka, M.
dc.contributor.authorRahbaran, B.
dc.contributor.authorRohringer, C.
dc.contributor.authorRohringer, H.
dc.contributor.authorSchöfbeck, R.
dc.contributor.authorStrauss, J.
dc.contributor.authorTaurok, A.
dc.contributor.authorWagner, P.
dc.contributor.authorWaltenberger, W.
dc.contributor.authorWalzel, G.
dc.contributor.authorWidl, E.
dc.contributor.authorWulz, C.-E.
dc.contributor.authorMossolov, V.
dc.contributor.authorShumeiko, N.
dc.contributor.authorSuarez Gonzalez, J.
dc.contributor.authorBansal, S.
dc.contributor.authorCornelis, T.
dc.contributor.authorDe Wolf, E.A.
dc.contributor.authorJanssen, X.
dc.contributor.authorLuyckx, S.
dc.contributor.authorMaes, T.
dc.contributor.authorMucibello, L.
dc.contributor.authorOchesanu, S.
dc.contributor.authorRoland, B.
dc.contributor.authorRougny, R.
dc.contributor.authorSelvaggi, M.
dc.contributor.authorStaykova, Z.
dc.contributor.authorVan Haevermaet, H.
dc.contributor.authorVan Mechelen, P.
dc.date.accessioned2026-10-18T20:30:48.584496209Z
dc.date.available2026-10-18T20:30:48.584496209Z
dc.date.issued2012
dc.description.abstractThe observation of a new b baryon via its strong decay into Ξb-π+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at √s=7TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3fb -1. The known Ξb- baryon is reconstructed via the decay chain Ξb-→J/ψΞ-→μ+μ -Λ0π-, with Λ0→pπ-. A peak is observed in the distribution of the difference between the mass of the Ξb-π+ system and the sum of the masses of the Ξb- and π+, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14.84±0.74(stat)±0.28(syst)MeV. The new state most likely corresponds to the JP=3/2+ companion of the Ξb. © 2012 CERN.
dc.description.sponsorshipNational Science Foundation, NSF; , (ST/I505580/1, ST/I505572/1, ST/I005912/1, ST/K001604/1, ST/I000410/1, ST/F007094/1, ST/G502347/1, ST/J004901/1, ST/H000925/1, ST/F007434/1, ST/F006748/1, ST/I002200/1, ST/J005665/1, GRIDPP, ST/H00081X/2); ; , (098-0982887-2878); ; Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF, (134939, 123501); Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF
dc.identifier.doi10.1103/physrevlett.108.252002
dc.identifier.issn0031-9007
dc.identifier.issue25
dc.identifier.scopus2-s2.0-84862891142
dc.identifier.startpage252002
dc.identifier.urihttps://rdlopen.rawdatalibrary.net/r/ebyu/15964
dc.identifier.volume108
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review Letters
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectCharge conjugate
dc.subjectData sample
dc.subjectDecay chains
dc.subjectIntegrated luminosity
dc.subjectMass difference
dc.subjectMost likely
dc.subjectStandard deviation
dc.titleObservation of a new Ξb baryon
dc.typeArticle
dspace.entity.typePublication
rdl.citation.scopus98
rdl.oa.statusgold
rdl.source.indexSCOPUS