Excited-state spectroscopy of triply bottom baryons from lattice QCD

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33 Scopus citations

Abstract

The spectrum of baryons containing three b quarks is calculated in nonperturbative QCD, using the lattice regularization. The energies of ten excited bbb states with JP=12 +, 32 +, 52 +, 72 +, 12 -, and 32 - are determined with high precision. A domain-wall action is used for the up, down, and strange quarks, and the bottom quarks are implemented with nonrelativistic QCD. The computations are done at lattice spacings of a≈0.11fm and a≈0.08fm, and the results demonstrate the improvement of rotational symmetry as a is reduced. A large lattice volume of (2.7fm)3 is used, and extrapolations of the bbb spectrum to realistic values of the light sea-quark masses are performed. All spin-dependent energy splittings are resolved with total uncertainties of order 1 MeV, and the dependence of these splittings on the couplings in the nonrelativistic QCD action is analyzed.

Original languageEnglish (US)
Article number114510
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number11
DOIs
StatePublished - Jun 25 2012
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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