skip to main content

DOE PAGESDOE PAGES

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

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 JP = 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.
Authors:
 [1]
  1. College of William and Mary, Williamsburg, VA (United States)
Publication Date:
Report Number(s):
JLAB-THY-12-1587; DOE/OR/23177-2209; arXiv:1202.1312
Journal ID: ISSN 1550-7998; PRVDAQ; TRN: US1203645
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCURACY; B QUARKS; BARYONS; QUANTUM CHROMODYNAMICS; QUARKS; SPECTROSCOPY; SYMMETRY
OSTI Identifier:
1045829
Alternate Identifier(s):
OSTI ID: 1103650