Nucleon structure with two flavors of dynamical domain-wall fermions

Journal Article · Tue Jul 01 00:00:00 EDT 2008 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.78.014505· OSTI ID:955832

Lin, Huey-Wen; Blum, Thomas; Ohta, Shigemi; Sasaki, Shoichi; Yamazaki, Takeshi

We present a numerical lattice quantum chromodynamics calculation of isovector form factors and the first few moments of the isovector structure functions of the nucleon. The calculation employs two degenerate dynamical flavors of domain-wall fermions, resulting in good control of chiral symmetry breaking. Non-perturbative renormalization of the relevant quark currents is performed where necessary. The inverse lattice spacing, $$a^{-1}$$, is about 1.7 GeV. We use degenerate up and down dynamical quark masses around 1, 3/4 and 1/2 the strange quark mass. The physical volume of the lattice is about $$(1.9{fm})^3$$. The ratio of the isovector vector to axial charges, $$g_A/g_V$$, trends a bit lower than the experimental value as the quark mass is reduced toward the physical point. We calculate the momentum-transfer dependences of the isovector vector, axial, induced tensor and induced pseudoscalar form factors. The Goldberger-Treiman relation holds at low momentum transfer and yields a pion-nuc

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-060R23177
• OSTI ID: 955832
• Report Number(s): JLAB-THY-08-779; arXiv:0802.0863; DOE/OR/23177-0328
• Journal Information: Physical Review D, Vol. 78
• Country of Publication: United States
• Language: English