Excited-state spectroscopy of triply bottom baryons from lattice QCD

Meinel, Stefan

doi:10.1103/PhysRevD.85.114510

Title: Excited-state spectroscopy of triply bottom baryons from lattice QCD

Journal Article · Mon Jun 25 00:00:00 EDT 2012 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.85.114510· OSTI ID:1045829

Meinel, Stefan ^[1]

College of William and Mary, Williamsburg, VA (United States)

Here, 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^P = 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, down, and strange quarks, and the bottom quarks are implemented with nonrelativistic QCD. 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 (2.7 fm)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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1045829

Alternate ID(s):: OSTI ID: 1103650

Report Number(s):: JLAB-THY-12-1587; DOE/OR/23177-2209; arXiv:1202.1312; PRVDAQ; TRN: US1203645

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 85, Issue 11; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Excited-state spectroscopy of triply bottom baryons from lattice QCD

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