Nucleon Structure from 2+1 Flavor Domain Wall QCD at Nearly Physical Pion Mass

Journal Article · Tue May 24 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3587599· OSTI ID:21516862

Ohta, Shigemi ^[1]

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1. Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801 (Japan)

The RBC and UKQCD collaborations have been investigating hadron physics in numerical lattice quantum chromodynamics (QCD) with (2+1) flavors of dynamical domain wall fermions (DWF) quarks that preserves continuum-like chiral and flavor symmetries. The strange quark mass is adjusted to physical value via reweighting and degenerate up and down quark masses are set as light as possible. In a recent study of nucleon structure we found a strong dependence on pion mass and lattice spatial extent in isovector axialvector-current form factors. This is likely the first credible evidence for the pion cloud surrounding nucleon. Here we report the status of nucleon structure calculations with a new (2+1)-flavor dynamical DWF ensembles with much lighter pion mass of 180 and 250 MeV and a much larger lattice spatial exent of 4.6 fm. A combination of the Iwasaki and dislocation-suppressing-determinant-ratio (I+DSDR) gauge action and DWF fermion action allows us to generate these ensembles at cutoff of about 1.4 GeV while keeping the residual breaking of chiral symmetry sufficiently small. Nucleon source Gaussian smearing has been optimized. Preliminary nucleon mass estimates are 0.98 and 1.05 GeV.

• OSTI ID: 21516862
• Journal Information: AIP Conference Proceedings, Vol. 1354, Issue 1; Conference: Tropical QCD II workshop, Cairns (Australia), 26 Sep - 1 Oct 2010; Other Information: DOI: 10.1063/1.3587599; (c) 2011 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
D QUARKS
FLAVOR MODEL
FORM FACTORS
GEV RANGE 01-10
ISOVECTORS
LATTICE FIELD THEORY
MAGNETIC MOMENTS
MASS
MEV RANGE 100-1000
NUCLEONS
OPTIMIZATION
PIONS
QUANTUM CHROMODYNAMICS
S QUARKS
SYMMETRY BREAKING
BARYONS
BOSONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
HADRONS
MATHEMATICAL MODELS
MESONS
MEV RANGE
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
STRANGE PARTICLES
SYMMETRY
TENSORS
VECTORS