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dc.contributorUniversitat Ramon Llull. La Salle
dc.contributorCERN
dc.contributor.authorCalvo Gómez, Míriam
dc.contributor.authorCamboni, Alessandro
dc.contributor.authorGolobardes, Elisabet
dc.contributor.authorVilasís Cardona, Xavier
dc.contributor.authorLHCb Collaboration - CERN
dc.date.accessioned2020-11-21T09:25:02Z
dc.date.accessioned2023-10-02T06:25:49Z
dc.date.available2020-11-21T09:25:02Z
dc.date.available2023-10-02T06:25:49Z
dc.date.created2020-02
dc.date.issued2020-06
dc.identifier.urihttp://hdl.handle.net/20.500.14342/3100
dc.description.abstractA new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√ = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The mass and natural width of the new state are measured to be m=6072.3±2.9±0.6±0.2 MeV, Γ=72±11±2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported.eng
dc.format.extent26 p.cat
dc.language.isoengcat
dc.publisherSpringercat
dc.relation.ispartofJournal of High Energy Physics, 2020, 136cat
dc.rightsAttribution 4.0 International
dc.rights© CERN
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceRECERCAT (Dipòsit de la Recerca de Catalunya)
dc.subject.otherGran col·lisionador d'hadrons (França i Suïssa)cat
dc.subject.otherPartícules (Física nuclear)cat
dc.subject.otherCol·lisions (Física nuclear)cat
dc.titleObservation of a new baryon state in the Λ0bπ+π− mass spectrumcat
dc.title.alternativeObservation of a new baryon state in the Lambda_b^0 pi^+ pi^- mass spectrumcat
dc.typeinfo:eu-repo/semantics/articlecat
dc.typeinfo:eu-repo/semantics/publishedVersioncat
dc.rights.accessLevelinfo:eu-repo/semantics/openAccess
dc.embargo.termscapcat
dc.subject.udc539
dc.identifier.doihttps://doi.org/10.1007/JHEP06(2020)136cat


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Attribution 4.0 International
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