phone: +81-29-864-5408, +1-631-344-3398

fax: +81-29-864-5755, +1-631-344-4067

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I am a member of the Theory Group of the Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK) of Japan.

My main interest is in lattice numerical study of quantum field theories, especially in lattice quantum chromodynamics (QCD). For this purpose, I use super-computing facility at the RIKEN BNL Research Center (RBRC) in the Brookhaven National Laboratory (BNL).

At the RBRC I joined
RIKEN/BNL/Columbia
QCD Project to build, in cooperation with Professors Bob Mawhinney
and
Norman Christ of Columbia
University,
a
TFLOPS-scale
parallel
supercomputer dedicated for lattice QCD. The computer,
called QCDSP, has a peak speed of 600 GFlops, and was awarded the
Gordon
Bell Prize for price performance at the Super Computing
98
(Orlando, Florida, November 1998).

This supercomputer was mainly used
by what is now called the RIKEN/BNL/Columbia (RBC) QCD
Collaboration. The Collaboration pioneered the numerical
application of the five-dimensional domain
wall
fermions
(DWF) method to QCD. See, for example, the
proceedings of an international workshop on Fermion
Frontiers
in
Vector
Lattice
Gauge
Theories (May 6 - 9, 1998) which
I
organized with Professor Mawhinney. It is available by writing to
the RBRC. We
terminated its
operation early in 2006 as the new QCDOC supercomputer became
available.

In the summer of 1999 we started
discussing a follow-up project to QCDSP. It soon developed
into
designing a
new, 10 TFlops supercomputer with some of Columbia
and
RIKEN-BNL people including Profeesors Christ and Mawhinney and
myself. Named QCDOC (QCD "On a Chip"), the new design
is
based
on the "system-on-a-chip" technology provided by IBM
Research.
The first five prototype QCDOC ASICs (Application-Specific
Integrated
Circuits) were delivered on June 5th, 2003. We received
thousands
more ASICs in the following months and assembled scores of
motherboards, each of
which is a 64-GFlops
peak speed computer with 64 QCDOC ASICs configured as a six
dimensional
hypercube. By the summer 2004 we were ready to assemble two
10-TFlops QCDOC
configurations, one for RBRC
and another for UKQCD.
They
were
complete
in
the
fall
of
2004
and
the
UKQCD
one
was
shipped
to
Edinburgh.
We
held
a
RBRC
and
Columbia
celebrations
on
May
26th and 27th
of 2005. Edinburgh
celebration was held on July 1st. Another 10-TFlops
configuration
supported by the US DOE was complete in the spring of 2005.

With the RBRC QCDOC computer and
its
sister machines funded by UK PPARC and US DOE, I
study varioius aspects of hadron physics, including CP violations
in
neutral K meson and structure of nucleon. Some works into
these
problems are found in the publications below.

Some of my recent publications
are:

- Some nucleon
isovector
observables from 2+1-flavor domain-wall QCD at the physical
pion mass,
for LHP, RBC and UKQCD Collaborations, PoS
LATTICE2015 (2016) 124,

- The Low Energy
Constants of SU(2) Partially Quenched Chiral Perturbation
Theory from
Nf=2+1 Domain Wall QCD, for RBC and UKQCD
Collaborations, Phys.
Rev. D93, 054502 (2016),

- Initial nucleon
structure results with chiral quarks at the physical point,
for RBC
and LHP collaborations, PoS
LATTICE2014 (2015) 134,

- Domain wall QCD
with physical quark mass, for RBC and UKQCD
Collaborations, submitted for publication in Physical Review D,

- Systematics
analyses on nucleon isovector observables in 2+1-flavor
dynamical
domain-walllattice QCD near physical mass, for RBC and
UKQCD
Collaborations, PoS
LATTICE2014 (2015) 149,

- Nucleon axial charge in 2+1-flavor dynamical DWF lattice QCD, for RBC and UKQCD Collaborations, PoS Lattice 2013 (2014) 274,
- Weak Decay Measurements from 2+1 flavor DWF ensembles, for RBC and UKQCD Collaborations, PoS Lattice 2013 (2014) 404,
- Finite-size scaling in nucleon axial charge from 2+1-flavor DWF lattice QCD, with Meifeng Lin, for RBC and UKQCD Collaborations, in Lattice 2012, PoS(Lattice 2012)171,
- DomainWall QCD with
Near-Physical Pions, for RBC and UKQCD
Collaborations, in Phys.
Rev. D87,
094514 (2013),

- Nucleon structure from 2+1-flavor dynamical DWF lattice QCD at nearly physical pion mass, with Meifeng Lin, for RBC and UKQCD Collaborations, in Erice School "From quarks and gluons to hadrons and nuclei," September 16-24, 2011, Erice, Sicily, in Progress in Particle and Nuclear Physics, 67, 218 (2012),
- Nucleon structure
from
2+1f dynamical DWF lattice QCD at nearly physical pion mass,
for
RBC and UKQCD
Collaborations, in Lattice 2011, PoS
(Lattice
2011)
168,

- Nucleon structure
from
2+1 flavor domain wall QCD at nearly physical pion mass,
for RBC
and UKQCD
Collaborations, in Tropical
QCD 2010,
AIP Conf. Proc. 1354, 148 (2011),

- Continuum Limit of BK from 2+1 Flavor Domain Wall QCD, for RBC and UKQCD Collaborations, in Phys. Rev. D84, 014503 (2011),
- Nucleon
structure
from RBC/UKQCD 2+1 flavor DWF dynamical ensembles at a nearly
physical
pion mass, for RBC and UKQCD
Collaborations, in Lattice
2010, PoS
(Lattice
2010)
152,

- Continuum Limit Physics from 2+1 Flavor Domain Wall QCD, for RBC and UKQCD Collaborations, in Phys. Rev. D83, 074508 (2011),
- Nucleon isovector
structure functions in (2+1)-flavor QCD with domain wall
fermions,
for RBC and UKQCD
Collaborations, in Phys.
Rev. D82,
014501 (2010),

- Nucleon structure
functions from dynamical (2+1)-flavor domain wall fermions,
for RBC
and UKQCD Collaborations, in Lattice
2009, PoS
(LAT
2009)
131,

- Nucleon form factors
with 2+1 flavor dynamical domain-wall fermions, with RBC
and UKQCD
Collaborations, in Phys.
Rev.
D79,
114505
(2009),

- Nucleon structure with dynamical (2+1)-flavor domain wall fermions lattice QCD, with Takeshi Yamazaki for RBC and UKQCD Collaborations, in Lattice 2008, PoS (LATTICE 2008) 168,
- Physical Results from
2+1 Flavor Domain Wall QCD and SU(2) Chiral Perturbation
Theory,
with
RBC and UKQCD
Collaborations, Phys.
Rev.
D
78,
114509
(2008),

- Nucleon structure
with
two flavors of dynamical domain-wall fermions, with RBC
Collaboration, Phys.
Rev.
D
78,
014505
(2008),

- Nucleon axial charge
in
2+1 flavor dynamical lattice QCD with domain wall fermions,
with
RBC and UKQCD Collaborations, Phys.
Rev.
Letters
100,
171602
(2008),

- Nucleon form factors
and
structure fnctions with N_f=2+1 dynamical domain-wall fermions,
with Takeshi Yamazaki for RBC and UKQCD Collaborations, in Lattice
2007,
PoS
LATTICE
2007,
165,

- Neutral kaon mixing from 2+1 flavor Domain Wall QCD, with RBC and UKQCD Collaborations, Phys. Rev. Letters 100, 032001 (2008),
- Localization and
chiral
symmetry in 2+1 flavor domain wall QCD, with RBC and UKQCD
Collaborations, Phys.
Rev.
D77,
014509
(2008),

- 2+1 flavor domain wall QCD on a (2 fm)^3 lattice: light meson spectroscopy with Ls = 16, with RBC and UKQCD Collaborations, Phys. Rev. D76, 014504 (2007),
- First results
from
2+1-Flavor Domain Wall QCD: Mass Spectrum, Topology Change and
Chiral
Symmetry with L_s=8, with RBC and UKQCD Collaborations, Phys.
Rev.
D75,
114501
(2007),

- Nucleon
structure
in lattice QCD with dynamical domain-wall fermions quarks
with Huey-Wen Lin
(Jefferson Lab), for the RBC
and UKQCD
Collaborations, in Lattice
2006,
PoS
LAT2006,
118,

- Charm as a
domain
wall fermion in quenched lattice QCD with Huey-Wen Lin
(Columbia), Amarjit
Soni (BNL)
and Norikazu
Yamada (KEK), for the RBC QCD Project, Phys. Rev.
D74,
114506 (2006),

- Heavy-light
mesons
with domain-wall fermions with HueyWen Lin
(Columbia)
and Norikazu
Yamada (KEK), for the RBC QCD Project, in Lattice 2005,

- The kaon B
parameter from quenched domain-wall QCD with the RBC QCD
Project, Phys.
Rev.
D73,
094507
(2006),

- Nucleon structure functions with domain wall fermions with Tom Blum (Connecticut) and Kostas Orginos (William and Mary) for the RBC QCD Project, Phys. Rev. D73, 094503 (2006),
- Overview
of
the
QCDSP
and
QCDOC
computers with the QCDOC collaboration, in IBM
Journal
of Research and Development 49, 351 (2005),

- Lattice
QCD with two dynamical flavors of domain wall quarks with
the RBC
QCD Project, Phys.
Rev.
D72,
114505
(2005),

- Nucleon structure with domain wall fermions with Kostas Orginos, for the RBC QCD Project, in Lattice 2004,
- Nucleon
axial charge and structure functions with domain wall fermions
also
with Kostas
Orginos,
for the RBC QCD Project, in Lattice 2003,

- Hardware and software status of QCDOC with the QCDOC collaboration, in Lattice 2003,
- Suppression of
ecological competition by apex predator with Taksu Cheon
(Kochi Tech),
Phys.
Rev.
E70,
021913
(2004),

- Nucleon axial
charge from quenched lattice QCD with domain wall fermions
with Shoichi
Sasaki (Tokyo), Kostas Orginos
and Tom Blum,
for the RBC QCD
Project, Phys.
Rev.
D68,
054509
(2003),

- Domain wall
fermions with improved gauge actions with the RBC QCD
Project, Phys.
Rev.
D69,
074504
(2004),

- Status of the
QCDOC project with the QCDOC collaboration, in Lattice 2002,

- Kaon matrix
elements and CP-violation from quenched lattice QCD: (I) the
3-flavor
case with the RBC QCD Project, Phys.
Rev.
D68,
114506
(2003),

- QCDOC: A
10-teraflops scale computer for lattice QCD also
with the
QCDOC collaboration, in Lattice 2001,

- A lattice
study
of the nucleon excited states with domain wall fermions
also
with Tom Blum
and
Shoichi Sasaki
for
the RBC QCD Project, Phys.
Rev.
D65,
074503
(2002),

- Quenched lattice QCD with domain wall fermions and the chiral limit with the RBC QCD Project, Phys. Rev. D69, 074502 (2004),
- Deconfinement transition and string tensions in SU(4) Yang-Mills Theory with Matt Wingate (Seattle), Phys. Rev. D63, 094502 (2001),
- Light hadron spectrum in quenched lattice QCD with staggered quarks with Seyong Kim (Sejong University), Phys. Rev. D61, 074506 (2000).

A more complete set of my publications can be found here.