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Direct Observation of the Strange b Baryon Xi(b)-.

Borissov, Guennadi and Bertram, I. A. and Fox, H. and Ratoff, Peter N. (2007) Direct Observation of the Strange b Baryon Xi(b)-. Physical Review Letters, 99 (5). 05200. ISSN 1079-7114

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Abstract

We report the first direct observation of the strange b baryon (). We reconstruct the decay J/-, with J/µ+µ-, and --p-- in p collisions at =1.96 TeV. Using 1.3 fb-1 of data collected by the D0 detector, we observe 15.2±4.4(stat)(syst) candidates at a mass of 5.774±0.011(stat)±0.015(syst) GeV. The significance of the observed signal is 5.5, equivalent to a probability of 3.3×10-8 of it arising from a background fluctuation. Normalizing to the decay bJ/, we measure the relative rate =0.28±0.09(stat)(syst).

Item Type: Article
Journal or Publication Title: Physical Review Letters
Additional Information: Borissov developed and implemented a special version of his offline tracking algorithm in the search for Xi_b which considerably increased the efficiency of the signal selection and was crucial for its observation. This is the first observation of a baryon containing quarks from all three families. RAE_import_type : Journal article RAE_uoa_type : Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2321
Deposited By: ep_importer
Deposited On: 02 Apr 2008 15:42
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2321

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