My collaborators and I seek to
understand
the nature of the strong force by studying the consequences of the
theory
of ``Quantum Chromodynamics'' (QCD). We use a powerful
non-perturbative
formulation of QCD, ``lattice QCD'', which requires the use of
supercomputers,
but which can evaluate properties of strongly-interacting particles
(hadrons)
with controllable systematic errors. Using a formulation with
exact
chiral symmetry on the lattice, we are exploring the structure of the QCD
vacuum, and are investigating
the properties of
hadrons at (world record) low quark mass and large spatial volume.
Education
B.Sc., Physics, University of
British
Columbia (1978)
M.Sc., Physics, UCLA (1979)
Ph.D., Theoretical Particle
Physics,
UCLA (1984)
Postdoctoral
Fellows
Andrei Alexandru
Ivan Horvath
Nilmani Mathur
Sonali Tamhankar
Selected
Recent Publications
T. Draper, S.J. Dong, I. Horvath, F.X.
Lee, N. Mathur, and J.B. Zhang, "An Algorithm for
Obtaining Reliable Priors for Constrained-Curve Fits", hep-lat/0309045.
S.J. Dong, T. Draper, I. Horvath, F.X.
Lee, K.F. Liu, N. Mathur,
and J.B. Zhang, "The Roper Resonance and S11(1535) from
Lattice QCD", hep-lat/0306199,
submitted for publication to Phys. Rev. Lett.
S.J. Dong, T. Draper, I. Horvath, F.X.
Lee, K.F. Liu, N. Mathur,
and J.B. Zhang, "Chiral Logs in Quenched QCD", hep-lat/0304005,
submitted for publication to Phys. Rev. D.
I. Horvath, S.J. Dong, T.
Draper, F.X.
Lee, K.F. Liu, N. Mathur, H.B. Thacker, and J.B. Zhang,
"Low-Dimensional Long-Range Topological Charge Structure in the QCD
Vacuum", hep-lat/0302009,
submitted for publication to Phys. Rev. D.
I. Horvath, S.J. Dong, T.
Draper, F.X.
Lee, K.F. Liu, H.B. Thacker, and J.B. Zhang, "On the Local Structure of
Topological Charge Fluctuations in QCD", Phys. Rev. D67, 011501 (2003).
I. Horvath, S.J. Dong, T.
Draper, N.
Isgur, F.X. Lee, K.F. Liu, J. McCune, H.B. Thacker, and J.B. Zhang,
"Local
Chirality of Low-lying Dirac Eigenmodes and the Instanton Liquid
Model", Phys. Rev. D66,
034501 (2002).
S.J. Dong, T. Draper, I.
Horvath, F.X.
Lee, K.F. Liu, and J.B. Zhang, "Chiral Properties of Pseudoscalar
Mesons
on a Quenched 204 Lattice with Overlap Fermions", Phys. Rev.
D65, 054507 (2002).
J. Christensen, T. Draper, and
C. McNeile,
"Renormalization of the Lattice HQET Isgur-Wise Function'', Phys. Rev.
D62, 114006 (2000).
T. Draper, "Status of Heavy
Quark Physics
on the Lattice'', Nucl. Phys. B (Proc. Suppl.) 73, 43-57 (1999).
K.F. Liu et al., "Valence QCD:
Connecting
QCD to the Quark Model'', Phys. Rev. D59, 112001 (1999).
J. Christensen, T. Draper, and
C. McNeile,
"A Calculation of the BB Parameter in the Static Limit'',
Phys.
Rev. D56, 6993-7011 (1997).
K.F. Liu, S.J. Dong, T. Draper,
and
W. Wilcox, ``pi NN and Pseudoscalar Form Factors from Lattice QCD'',
Phys.
Rev. Lett., 2172 (1995).
