skip to main content

DOE PAGESDOE PAGES

Title: Nucleon, $$\Delta$$ and $$\Omega$$ excited states in $N_f=2+1$ lattice QCD

The energies of the excited states of the Nucleon, $$\Delta$$ and $$\Omega$$ are computed in lattice QCD, using two light quarks and one strange quark on anisotropic lattices. The calculation is performed at three values of the light quark mass, corresponding to pion masses $$m_{\pi}$$ = 392(4), 438(3) and 521(3) MeV. We employ the variational method with a large basis of interpolating operators enabling six energies in each irreducible representation of the lattice to be distinguished clearly. We compare our calculation with the low-lying experimental spectrum, with which we find reasonable agreement in the pattern of states. In addition, the need to include operators that couple to the expected multi-hadron states in the spectrum is clearly identified.
Authors:
;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1] ;  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Washington, Seattle, WA (United States)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
OSTI Identifier:
985704
Report Number(s):
JLAB-THY--10-1170; DOE/OR/23177--1219
Journal ID: ISSN 1550-7998; PRVDAQ; TRN: US1006180
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 82; Journal Issue: 1; 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), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXCITED STATES; IRREDUCIBLE REPRESENTATIONS; PIONS; QUANTUM CHROMODYNAMICS; QUARKS; VARIATIONAL METHODS