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Observation of a New Ξb Baryon

(CMS Collaboration) Chatrchyan, S.; Brigljević, Vuko; Đurić, Senka; Kadija, Krešo; Luetić, Jelena; Morović, Srećko (2012) Observation of a New Ξb Baryon. Physical Review Letters, 108 (25). 252002/1-252002/15. ISSN 0031-9007

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Abstract

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=7  TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3  fb-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.

Item Type: Article
Uncontrolled Keywords: baryon
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Eksperimentalna fizika na LHC energijama[93132] Krešo Kadija098-0982887-2878MZOS
Depositing User: Krešo Kadija
Date Deposited: 16 Sep 2013 13:26
Last Modified: 03 Feb 2016 15:03
URI: http://fulir.irb.hr/id/eprint/615
DOI: 10.1103/PhysRevLett.108.252002

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