Nucleon, $$\Delta$$ and $$\Omega$$ excited states in $$N_f=2+1$$ lattice QCD
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Univ. of Maryland, College Park, MD (United States)
- Univ. of Washington, Seattle, WA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC05-06OR23177
- OSTI ID:
- 985704
- Report Number(s):
- JLAB-THY-10-1170; DOE/OR/23177-1219; PRVDAQ; TRN: US1006180
- Journal Information:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 82, Issue 1; ISSN 1550-7998
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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