The quark model and b baryons

Marek Karliner, Boaz Keren-Zur, Harry J. Lipkin, Jonathan L. Rosner

Research output: Contribution to journalArticlepeer-review

Abstract

The recent observation at the Tevatron of Σb± (uub and ddb) baryons within 2 MeV of the predicted Σb - Λb splitting and of Ξb- (dsb) baryons at the Tevatron within a few mega electron volts (MeV) of predictions has provided strong confirmation for a theoretical approach based on modeling the color hyperfine interaction. The prediction of M (Ξb-) = 5790-5800 MeV is reviewed and similar methods used to predict the masses of the excited states Ξb and Ξb*. The main source of uncertainty is the method used to estimate the mass difference mb - mc from known hadrons. We verify that corrections due to the details of the interquark potential and to Ξbb mixing are small. For S-wave qqb states we predict M (Ωb) = 6052.1 ± 5.6 MeV, M (Ωb*) = 6082.8 ± 5.6 MeV, and M (Ξb0) = 5786.7 ± 3.0 MeV. For states with one unit of orbital angular momentum between the b quark and the two light quarks we predict M (Λb [3 / 2]) = 5929 ± 2 MeV, M (Λb [3 / 2]) = 5940 ± 2 MeV, M (Ξb [1 / 2]) = 6106 ± 4 MeV, and M (Ξb [3 / 2]) = 6115 ± 4 MeV. Results are compared with those of other recent approaches.

Original languageEnglish
Pages (from-to)2-15
Number of pages14
JournalAnnals of Physics
Volume324
Issue number1
DOIs
StatePublished - Jan 2009

Keywords

  • Beauty baryons
  • Hardon spectroscopy
  • Heavy quarks

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