First Calculation of Hyperon Axial Couplings from Lattice QCD

Journal Article · Thu Dec 06 04:00:00 EST 2007

OSTI ID:920503

Lin, Huey-Wen; Orginos, Konstantinos

In this work, we report the first lattice calculation of the hyperon axial couplings, using the 2+1-flavor MILC configurations and domain-wall fermion valence quarks. Both the $$\Sigma$$ and $$\Xi$$ axial couplings are for the first time done in lattice QCD, and we find the numbers with greater precision than previous chiral perturbation theory and large-$$N_c$$ theory estimate: $$g_{\Sigma\Sigma} = 0.450(21)_{\rm stat}(22)_{\rm syst}$$ and $$g_{\Xi\Xi} = -0.277(15)_{\rm stat}(16)_{\rm syst}$$. As a side product, we also determine the low-energy chiral parameters $$D$$ and $$F$$ extracted from these coupling constants: $$D=0.715(6)_{\rm stat}(6)_{\rm syst}$$ and $$F=0.453(5)_{\rm stat}(5)_{\rm syst}$$.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 920503
• Report Number(s): JLAB-THY-07-761; DOE/OR/23177-0222
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
COUPLING CONSTANTS
FERMIONS
HYPERONS
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARKS
VALENCE