(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
|
PDF
- Published Version
Available under License Creative Commons Attribution. Download (323kB) | Preview |
|
|
PDF
- Accepted Version
Available under License Creative Commons Attribution. Download (355kB) | Preview |
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: |
|
||||||||
| Depositing User: | Krešo Kadija | ||||||||
| Date Deposited: | 16 Sep 2013 13:26 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/615 | ||||||||
| DOI: | 10.1103/PhysRevLett.108.252002 |
Actions (login required)
 |
View Item |
Altmetric
Altmetric
