Nucleon structure functions from dynamical (2+1)-flavor domain wall fermions (2009)
Ohta, Shigemi, RBC, For The, Collaborations, UKQCD
We report lattice-volume independence of low moments of nucleon structure functions from the coarse RIKEN-BNL-Columbia (RBC) and UKQCD joint dynamical (2+1)-flavor domain-wall fermions (DWF)...
Nucleon form factors with 2+1 flavor dynamical domain-wall fermions (2009)
Yamazaki, Takeshi, Aoki, Yasumichi, Blum, Tom, Lin, Huey-Wen, Ohta, Shigemi, Sasaki, Shoichi, ...
We report our numerical lattice QCD calculations of the isovector nucleon form factors for the vector and axialvector currents: the vector, induced tensor, axialvector, and induced pseudoscalar form...
Nucleon structure with dynamical (2+1)-flavor domain wall fermions lattice QCD (2008)
Ohta, Shigemi, Yamazaki, Takeshi
We report isovector form factors and low moments of isovector structure functions of nucleon from the coarse RIKEN-BNL-Columbia (RBC) and UKQCD joint dynamical (2+1)-flavor domain-wall fermions (DWF)...
Physical Results from 2+1 Flavor Domain Wall QCD and SU(2) Chiral Perturbation Theory (2008)
Blum, Tom, Mawhinney, Robert D., Ohta, Shigemi
We have simulated QCD using 2+1 flavors of domain wall quarks on a $(2.74 {\rm fm})^3$ volume with an inverse lattice scale of $a^{-1} = 1.729(28)$ GeV. The up and down (light) quarks are degenerate...
Nucleon structure with two flavors of dynamical domain-wall fermions (2008)
Lin, Huey-Wen, Blum, Tom, 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...
Nucleon form factors and structure functions with N_f=2+1 dynamical domain wall fermions (2007)
We report isovector form factors and low moments of structure functions of nucleon in numerical lattice quantum chromodynamics (QCD) from the on-going calculations by the RIKEN-BNL-Columbia (RBC) and...
Localization and chiral symmetry in 2+1 flavor domain wall QCD (2007)
Antonio, David J., Bowler, Kenneth C., Boyle, Peter A., Christ, Norman H., Clark, Michael A., Cohen, Saul D., ...
We present results for the dependence of the residual mass of domain wall fermions (DWF) on the size of the fifth dimension and its relation to the density and localization properties of low-lying...
Nucleon structure in lattice QCD with dynamical domain-wall fermions quarks (2006)
We report RBC and RBC/UKQCD lattice QCD numerical calculations of nucleon electroweak matrix elements with dynamical domain-wall fermions (DWF) quarks. The first, RBC, set of dynamical DWF ensembles...
Charm as a domain wall fermion in quenched lattice QCD (2006)
Lin, Huey-Wen, Ohta, Shigemi, Soni, Amarjit, Yamada, Norikazu
We report a study describing the charm quark by a domain-wall fermion (DWF) in lattice quantum chromodynamics (QCD). Our study uses a quenched gauge ensemble with the DBW2 rectangle-improved gauge...
Heavy-light mesons with domain wall fermions (2005)
Lin, HueyWen, Ohta, Shigemi, Yamada, Norikazu, Collaboration, For The RBC
We present RBC heavy-light meson spectroscopy with quenched DBW2 gauge configurations at lattice cutoff of about 3 GeV. Both heavy and light quarks are described by domain-wall fermions (DWF). The...
Nucleon structure functions with domain wall fermions (2005)
Orginos, Kostas, Blum, Thomas, Ohta, Shigemi
We present a quenched lattice QCD calculation of the first few moments of the polarized and un-polarized structure functions of the nucleon. Our calculations are done using domain wall fermions and...
Overview of the QCDSP and QCDOC computers (2005)
Boyle, Peter A., Chen, Dong, Christ, Norman H., Clark, Michael A., Cohen, Saul D., Cristian, Calin, ...
The QCDSP and QCDOC computers are two generations of multithousand-node multidimensional mesh-based computers designed to study quantum chromodynamics (QCD), the theory of the strong nuclear force....
Nucleon structure with domain wall fermions (2004)
Ohta, Shigemi, Orginos, Kostas
We report the status of RBCK calculations on nucleon structure with quenched and dynamical domain wall fermions. The quenched results for the moments of structure functions (< x >_q), (< x>_{\Delta u...
Nucleon axial charge and structure functions with domain wall fermions (2003)
Ohta, Shigemi, Orginos, Kostas, Collaboration, For The RBCK
We report the current status of RBCK calculations on nucleon structure with both quenched and unquenched lattice QCD. The combination of domain wall fermions and DBW2 gauge action works well for...
Suppression of Ecological Competition by Apex Predator (2003)
In the framework of Lotka-Volterra dynamics with evolutionary parameter variation, it is shown that a system of two competing species which is evolutionarily unstable, if left to themselves, is...
Nucleon axial charge from quenched lattice QCD with domain wall fermions (2003)
Sasaki, Shoichi, Orginos, Kostas, Ohta, Shigemi, Blum, Tom, Collaboration, For The RBCK
We present a quenched lattice calculation of the nucleon isovector vector and axial-vector charges gV and gA. The chiral symmetry of domain wall fermions makes the calculation of the nucleon axial...
The domain wall fermion (DWF) method, with its almost perfectly preserved chiral symmetry on the lattice, makes the calculation of the nucleon axial charge particularly easy. By maintaining chiral...
Zero temperature phase structure of multi-flavor QCD (2001)
To study continuum limit of lattice QCD with many light quark flavors, we investigate the zero temperature phase structures of multi-flavor QCD. Currently a series of exploratory simulations are...
Sasaki, Shoichi, Blum, Tom, Ohta, Shigemi, Orginos, Kostas
In our previous DWF calculation with the Wilson gauge action at $\beta=6.0$ ($a^{-1}\simeq$ 1.9 GeV) on a $16^3 \times 32 \times 16$ lattice, we found that $\Ga$ had a fairly strong dependence on the...
A Lattice Study of the Nucleon Excited States with Domain Wall Fermions (2001)
Sasaki, Shoichi, Blum, Tom, Ohta, Shigemi
We present results of our numerical calculation of the mass spectrum for isospin one-half and spin one-half non-strange baryons, i.e. the ground and excited states of the nucleon, in quenched lattice...
Domain wall fermion calculation of nucleon g_A/g_V (2000)
Blum, Tom, Ohta, Shigemi, Sasaki, Shoichi
We present a preliminary domain-wall fermion lattice-QCD calculation of isovector vector and axial charges, g_V and g_A, of the nucleon. Since the lattice renormalizations, Z_V and Z_A, of the...
Deconfinement transition and string tensions in SU(4) Yang-Mills Theory (2000)
Wingate, Matthew, Ohta, Shigemi
We present results from numerical lattice calculations of SU(4) Yang-Mills theory. This work has two goals: to determine the order of the finite temperature deconfinement transition on an $N_t = 6$...
Light Hadron Spectrum in Quenched Lattice QCD with Staggered Quarks (1999)
Without chiral extrapolation, we achieved a realistic nucleon to (\rho)-meson mass ratio of (m_N/m_\rho = 1.23 \pm 0.04 ({\rm statistical}) \pm 0.02 ({\rm systematic})) in our quenched lattice QCD...
SU(4) pure-gauge phase structure and string tensions (1999)
Ohta, Shigemi, Wingate, Matthew
We present numerical evidence that the SU(4) pure-gauge dynamics has a finite-temperature first-order phase transition. For a $6\times 20^3$ lattice, this transition occurs at the inverse-square...
Chiral limit of light hadron mass in quenched staggered QCD (1998)
We discuss chiral limit of light hadron mass from our quenched staggered calculations with a high lattice cutoff of (a^{-1})(\sim)3.7 GeV at (\beta)=6.5 and a large lattice volume of (48^3\times 64)....
SU(4) pure-gauge string tensions (1998)
Ohta, Shigemi, Wingate, Matthew
In response to recently renewed interests in SU(N) pure-gauge dynamics with large N, both from M/string duality and from finite-temperature QCD phase structure, we calculate string tensions acting...
Quenched staggered light hadron spectroscopy from $48^3\times64$ at $\beta = 6.5$ (1997)
We report our light hadron mass calculation based on an increased statistics of 250 quenched gauge configurations on a (48^3 \times 64) lattice at (\beta = 6.5). Quark propagators are calculated for...
Quenched KS light hadron mass at \beta=6.5 on a 64\times 48^3 lattice (1996)
We report our quenched staggered light hadron mass calculation at the coupling of \beta = 6.5 on a 48^3 \times 64 lattice, based on an increased statistics of two hundred gauge configurations....
Light hadron masses with 4-GeV cutoff and L=2.4fm (1995)
We discuss preliminary results from our quenched light hadron mass calculation on a $48^3 \times 64$ lattice at the coupling of $\beta = 6.5$. Staggered quarks with masses of $m_q = 0.01, 0.005,...
Phases of the three-state Potts model in three spatial dimensions (1993)
The three-state Potts model is numerically investigated on three-dimensional simple cubic lattices of up to \(128^3\) volume, concentrating on the neighborhood of the first-order phase transition...
Large scale numerical simulation of the three-state Potts model (1992)
The three-state Potts model is numerically investigated on three-dimensional simple cubic lattices of up to \(128^3\) volume, concentrating on the neighborhood of the first-order phase transition...