Observation of a New Ξb Baryon

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dc.citation.firstpage252002
dc.citation.issueNumber25
dc.citation.journalTitlePhysical Review Letters
dc.citation.volumeNumber108
dc.contributor.authorAdair, A.
dc.contributor.authorBoulahouache, C.
dc.contributor.authorEcklund, K.M.
dc.contributor.authorGeurts, F.J.M.
dc.contributor.authorPadley, B.P.
dc.contributor.authorRedjimi, R.
dc.contributor.authorRoberts, J.
dc.contributor.authorZabel, J.
dc.date.accessioned2015-09-03T14:48:30Z
dc.date.available2015-09-03T14:48:30Z
dc.date.issued2012
dc.description.abstractThe observation of a new b baryon via its strong decay into Ξ−bπ+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at √s=7  TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3  fb−1. The known Ξ−b baryon is reconstructed via the decay chain Ξ−b→J/ψΞ−→μ+μ−Λ0π−, with Λ0→pπ−. A peak is observed in the distribution of the difference between the mass of the Ξ−bπ+ system and the sum of the masses of the Ξ−b 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.
dc.identifier.citationAdair, A., Boulahouache, C., Ecklund, K.M., et al.. "Observation of a New Ξb Baryon." <i>Physical Review Letters,</i> 108, no. 25 (2012) American Physical Society: 252002. http://dx.doi.org/10.1103/PhysRevLett.108.252002.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.108.252002
dc.identifier.urihttps://hdl.handle.net/1911/81620
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.titleObservation of a New Ξb Baryon
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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