A5107306888- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Algorithms and Data Compression
- Cold Atom Physics and Bose-Einstein Condensates
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Quantum many-body systems
- Spectroscopy and Quantum Chemical Studies
- Parallel Computing and Optimization Techniques
- Nuclear physics research studies
- International Science and Diplomacy
- Stochastic processes and statistical mechanics
- Machine Learning in Materials Science
- Quantum, superfluid, helium dynamics
- Evolution and Genetic Dynamics
- Analytical Methods in Pharmaceuticals
- Scientific Computing and Data Management
High Energy Accelerator Research Organization
2011-2023
Lehigh Hanson (Canada)
2023
University of Bonn
2023
RIKEN BNL Research Center
2010-2020
The Graduate University for Advanced Studies, SOKENDAI
2010-2020
Brookhaven National Laboratory
2009-2020
Institute of Particle and Nuclear Studies
2008-2019
Michigan State University
2019
Nippon Soken (Japan)
2006-2019
University of Connecticut
2008-2016
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 $a^{-1} = 1.729(28)$ GeV. The up and down (light) are degenerate in our calculations we used four values for the ratio light quark masses to strange (heavy) mass simulations: 0.217, 0.350, 0.617 0.884. measured pseudoscalar meson decay constants, kaon bag parameter $B_K$ vector couplings. SU(2) chiral perturbation theory, which assumes only small, SU(3) theory...
We present results for several light hadronic quantities ($f_\pi$, $f_K$, $B_K$, $m_{ud}$, $m_s$, $t_0^{1/2}$, $w_0$) obtained from simulations of 2+1 flavor domain wall lattice QCD with large physical volumes and nearly-physical pion masses at two spacings. perform a short, O(3)%, extrapolation in mass to the values by combining our new data simultaneous chiral/continuum `global fit' number other ensembles heavier masses. use $m_\pi$, $m_K$ $m_\Omega$ determine quark scale - all are outputs...
We present physical results obtained from simulations using 2+1 flavors of domain wall quarks and the Iwasaki gauge action at two values lattice spacing $a$, ($a^{-1}$=\,1.73\,(3)\,GeV $a^{-1}$=\,2.28\,(3)\,GeV). On coarser lattice, with $24^3\times 64\times 16$ points, analysis ref.[1] is extended to approximately twice number configurations. The ensembles on finer $32^3\times are new. explain how we use data several for a range quark masses in combined continuum-chiral fits order obtain...
We present physical results for a variety of light hadronic quantities obtained via combined analysis three $2+1$ flavour domain wall fermion ensemble sets. For two our sets we used the Iwasaki gauge action with $\ensuremath{\beta}=2.13$ (${a}^{\ensuremath{-}1}=1.75(4)\text{ }\text{ }\mathrm{GeV}$) and $\ensuremath{\beta}=2.25$ (${a}^{\ensuremath{-}1}=2.31(4)\text{ lattice sizes ${24}^{3}\ifmmode\times\else\texttimes\fi{}64$ ${32}^{3}\ifmmode\times\else\texttimes\fi{}64$ respectively,...
Quenched QCD simulations on three volumes ${8}^{3}\ifmmode\times\else\texttimes\fi{},$ ${12}^{3}\ifmmode\times\else\texttimes\fi{}$ and ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ couplings $\ensuremath{\beta}=5.7,$ 5.85 6.0 using domain wall fermions provide a consistent picture of quenched QCD. We demonstrate that the small induced effects chiral symmetry breaking inherent in this formulation can be described by residual mass ${(m}_{\mathrm{res}})$ whose size decreases as separation...
We present results for light meson masses and pseudoscalar decay constants from the first of a series lattice calculations with $2+1$ dynamical flavors domain wall fermions Iwasaki gauge action. The work reported here was done at fixed spacing about 0.12 fm on ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ lattice, which amounts to spatial volume $(2\text{ }\text{ }\mathrm{fm}{)}^{3}$ in physical units. number sites fifth dimension is 16, gives ${m}_{\mathrm{res}}=0.00308(4)$ these...
We report our numerical lattice QCD calculations of the isovector nucleon form factors for vector and axial-vector currents: vector, induced tensor, axial-vector, pseudoscalar factors. The calculation is carried out with gauge configurations generated ${N}_{f}=2+1$ dynamical domain-wall fermions Iwasaki actions at $\ensuremath{\beta}=2.13$, corresponding to a cutoff ${a}^{\ensuremath{-}1}=1.73\text{ }\text{ }\mathrm{GeV}$, spatial volume $(2.7\text{ }\mathrm{fm}{)}^{3}$. up down-quark masses...
We present results for the nucleon axial charge ${g}_{A}$ at a fixed lattice spacing of $1/a=1.73(3)\text{ }\text{ }\mathrm{GeV}$ using $2+1$ flavors domain wall fermions on size ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ and ${24}^{3}\ifmmode\times\else\texttimes\fi{}64$ lattices ($L=1.8$ 2.7 fm) with length 16 in fifth dimension. The Monte Carlo trajectory lightest ${m}_{\ensuremath{\pi}}$ is 7360 units, including 900 thermalization. find finite volume effects are larger than pion mass...
We report on numerical lattice QCD calculations of some the low moments nucleon structure functions. The are carried out with gauge configurations generated by RBC and UKQCD collaborations (2+1)-flavors dynamical domain wall fermions Iwasaki action ($\beta = 2.13$). inverse spacing is $a^{-1} 1.73$ GeV, two spatial volumes ((2.7{\rm fm})^3) ((1.8 {\rm used. up down quark masses varied so pion mass lies between 0.33 0.67 GeV while strange about 12 % heavier than physical one. function we...
We determine the neutral kaon mixing matrix element ${B}_{K}$ in continuum limit with $2+1$ flavors of domain wall fermions, using Iwasaki gauge action at two different lattice spacings. These fermions have near exact chiral symmetry and therefore avoid artificial operator mixing. introduce a significant improvement to conventional nonperturbative renormalization (NPR) method which bare elements are renormalized nonperturbatively regularization invariant momentum scheme (RI-MOM) then...
We have performed fits of the pseudoscalar masses and decay constants, from a variety RBC-UKQCD domain wall fermion ensembles, to $SU(2)$ partially quenched chiral perturbation theory at next-to leading order (NLO) next-to-next-to (NNLO). report values for 9 NLO 8 linearly independent combinations NNLO low energy which we compare other lattice phenomenological determinations. discuss size successive terms in expansion use our large set constants make predictions mass splittings due QCD...
We present results of our numerical calculation the mass spectrum for isospin one-half and spin non-strange baryons, i.e. ground excited states nucleon, in quenched lattice QCD. use a new discretization scheme fermions, domain wall which possess almost exact chiral symmetry at non-zero spacing. make systematic investigation negative-parity $N^*$ by using two distinct interpolating operators $\beta=6/g^2=6.0$ on $16^3 \times 32 16$ lattice. The estimates extracted from are consistent with...
We report the results of a calculation $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}\ensuremath{\pi}$ matrix elements relevant for $\ensuremath{\Delta}I=1/2$ rule and ${\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon}$ in quenched lattice QCD using domain wall fermions at fixed spacing ${a}^{\ensuremath{-}1}\ensuremath{\sim}2\mathrm{GeV}.$ Working three-quark effective theory, where only u, d, s quarks enter which is known perturbatively to next-to-leading order, we...
We present the first results for neutral-kaon mixing using (2+1)-flavors of domain-wall fermions. A new approach is used to extrapolate physical up and down quark masses from our numerical studies with pion in range 240-420 MeV; only SU(2)_{L}xSU(2)_{R} chiral symmetry assumed kaon not be light. Our main result B_{K};{MS[over ]}(2 GeV)=0.524(10)(28) where error statistical second incorporates estimates all systematic errors.
We present a numerical lattice quantum chromodynamics calculation of isovector form factors and the first few moments structure functions nucleon. The employs two degenerate dynamical flavors domain-wall fermions, resulting in good control chiral symmetry breaking. Nonperturbative renormalization relevant quark currents is performed where necessary. DBW2 gauge action used to further improve behavior while maintaining reasonable physical volume. inverse spacing, ${a}^{\ensuremath{-}1}$,...
We study the chiral properties of quenched domain wall fermions with several gauge actions. demonstrate that residual symmetry breaking, which is present for a finite number lattice sites in fifth dimension ($L_s$), can be substantially suppressed using improved In particular Symanzik action, Iwasaki and renormalization group called doubly blocked Wilson (DBW2), are studied compared to action. All actions show reduction additive quark mass, $\mres$. Remarkably, DBW2 case $\mres$ roughly two...
We present results from the first large-scale study of two flavor QCD using domain wall fermions (DWF), a chirally symmetric fermion formulation which has proven to be very effective in quenched approximation. work on lattices size 16^3x32, with lattice cut-off a^{-1}\approx 1.7 GeV, and dynamical (or sea) quark masses range m_{strange}/2 \simle m_{sea} m_{strange}. After discussing algorithmic implementation issues involved simulating DWF, we report low-lying hadron spectrum, decay...
The QCDSP and QCDOC computers are two generations of multithousand-node multidimensional mesh-based designed to study quantum chromodynamics (QCD), the theory strong nuclear force. (QCD on digital signal processors), a four-dimensional mesh machine, was completed in 1998; that year, it won Gordon Bell Prize price/performance category. Two large installations—of 8,192 12,288 nodes, with combined peak speed one teraflops—have been operation since. QCD-on-a-chip (QCDOC) utilizes six-dimensional...
We present a quenched lattice calculation of the nucleon isovector vector and axial-vector charges ${g}_{V}$ ${g}_{A}.$ The chiral symmetry domain wall fermions makes axial charge particularly easy since Ward-Takahashi identity requires currents to have same renormalization, up spacing errors order ${O(a}^{2}).$ doubly blocked Wilson 2 (DBW2) gauge action provides enhancement good properties at larger than conventional action. Taking advantage these methods performing high statistics...
Finite-temperature behavior of quantum chromodynamics with two light dynamical flavors is studied by Langevin simulation on a ${8}^{3}$\ifmmode\times\else\texttimes\fi{}4 lattice the Kogut-Susskind quark action. It found that chiral transition strengthens as mass ${m}_{q}$ decreases towards zero, changing from continuous crossover at ${m}_{q}$a=0.2 to first-order ${m}_{q}$a=0.1. The critical coupling ${m}_{q}$=0 estimated be ${\ensuremath{\beta}}_{c}$=6/${g}_{c}^{2}$=5.29--5.32, and physical...
We present results for the dependence of residual mass domain wall fermions on size fifth dimension and its relation to density localization properties low-lying eigenvectors corresponding Hermitian Wilson Dirac operator in three flavor QCD. Using DBW2 Iwasaki gauge actions, we generate ensembles configurations with a ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ space-time volume an extent 8 sea quarks. demonstrate existence regime where degree locality, chiral symmetry breaking, rate...
Finite-temperature behavior of lattice QCD is studied with the Wilson fermion action and use Langevin technique for treating quarks dynamically. It found that transition zone from low- to high-temperature does not cross line critical hopping parameter, but rather continues down strong-coupling limit. Practical implications spectroscopic simulations at small quark masses are discussed.
We present results for the static interquark potential, light meson and baryon masses, pseudoscalar decay constants obtained from simulations of domain wall QCD with one dynamical flavour approximating s quark, two degenerate flavours input bare masses ranging ms to ms/4 u d quarks. compare these quantities using Iwasaki DBW2 improved gauge actions, actions larger rectangle coefficients, on 163×32 lattices. seek parameter values at which both chiral symmetry breaking residual mass due finite...