Direct observation of the strange b baryon Xi_b^{-}
| dc.creator | D0 Collaboration | |
| dc.creator | Abazov, V. | |
| dc.date | 2007-06-12 | |
| dc.date | 2007-08-31 | |
| dc.date.accessioned | 2026-07-07T11:56:56Z | |
| dc.date.available | 2026-07-07T11:56:56Z | |
| dc.description | We report the first direct observation of the strange b baryon Xi_b^{-}. We reconstruct the decay Xi_b^{-} to J/psi Xi^{-}, with J/psi to dimuons and Xi^{-} to Lambda pion, in ppbar collisions at sqrt(s) = 1.96 TeV. Using 1.3 fb^{-1} of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat.)+ 1.9/-0.4(syst.) Xi_b^{-} candidates at a mass of 5.774 +/- 0.011(stat.) +/- 0.015 (syst.) GeV. The significance of the observed signal is 5.5 sigmas, equivalent to a probability of 3.3 X 10^{-8} of it arising from a background fluctuation. Normalizing to the decay Lambda_b to J/psi Lambda, we measure the relative rate to be 0.28 +/- 0.09(stat.)+ 0.09/-0.08 (syst.). | |
| dc.description | Version published in Phys. Rev. Lett | |
| dc.identifier | https://arxiv.org/abs/0706.1690 | |
| dc.identifier | http://arxiv.org/abs/0706.1690 | |
| dc.identifier | Phys.Rev.Lett.99:052001,2007 | |
| dc.identifier | doi:10.1103/PhysRevLett.99.052001 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/205712 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Direct observation of the strange b baryon Xi_b^{-} | |
| dc.type | text |