Excited-state spectroscopy of triply-bottom baryons from lattice QCD
نویسنده
چکیده
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 J = 1 2 + , 3 2 + , 5 2 + , 7 2 + , 1 2 − , and 3 2 − are determined with high precision. A domain-wall action is used for the up-, downand strange quarks, and the bottom quarks are implemented with NRQCD. The computations are done at lattice spacings of a ≈ 0.11 fm and a ≈ 0.08 fm, and the results demonstrate the improvement of rotational symmetry as a is reduced. A large lattice volume of (2.7fm) 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 NRQCD action is analyzed.
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