I joined the
particle theory group in the
Physics Department at the University of Washington in 1988.
My current research interests focus on
lattice gauge theory, in particular the calculation of weak matrix
elements which are needed to constrain the Standard Model
of particle physics, as well as the idea of "large-N reduction",
whereby in the limit of the large number of
colors one can reduce the volume of the theory to
a single point. I am involved in the US national lattice QCD collaboration,
"USQCD" (see links below).
I am also a member of the Particle Data Group (link below), and of the
Flavor Lattice Averaging Group.
Professor of Physics
Department of Physics, University of Washington
My present graduate student is Max Hansen; I am also working closely
with a visiting student from Krakow, Mateusz Koren.
My previous graduate students
are Keith Clay (joint with Steve Ellis, presently Chair of Physics
at Green River Community College), Yan Zhang (was postdoc at Beijing U.,
present whereabouts unknown),
Noam Shoresh (joint with David B. Kaplan, first postdoc at Boston U,
now on the research staff at the Broad Institute, Cambridge, MA)
Ruth Van de Water (first postdoc at Fermilab, second
at Brookhaven National Lab, now staff member at Fermilab)
and Jackson Wu (first postdoc at Triumf, Vancouver, second
at University of Bern, Switzerland, now in Taiwan),
and Andrew Lytle (first postdoc at Univ. Southampton, England,
now at TIFR, Mumbai, India).
Recent talks and lectures:
"Challenges and prospects for K and D physics from lattice QCD"
Intensity Frontier workshop, Argonne Nat. Lab., April 26, 2013.
"Scientific and Computational Challenges at the Intensity Frontier"
invited talk at
USQCD All Hands meeting,
April 19, 2013.
Updated lectures on
"Effective field theories for lattice QCD"
"New Horizons in Lattice Field Theory"
Natal, Brazil, March 13-27, 2013
Overview and introduction to continuum chiral perturation theory.
Continuum ChPT completed: Adding sources; Next-to-leading chiral Lagrangian;
Examples of results; Heavy kaon ChPT; Finite volume effects in ChPT.
Including discretization errors in ChPT (mainly for twisted-mass fermions)
Partially quenched QCD and partially quenched ChPT plus
a discussion of whether m_up=0 is ambiguous.
"Future Applications of Lattice QCD for High Energy Physics"
at INT Summer School, August 10th, 2012.
(Here's a link to the
"Multiple-channel generalization of Lellouch-Luscher formula"
at INT Program on "Lattice QCD Studies of Excited Resonances and
Multi-Hadron Systems", August 9th, 2012.
Contributed talk at Lattice 2012 on
"Chiral extrapolation of matrix elements of BSM kaon operators"
, Cairns, Australia, June 25, 2012.
at workshop on new fermion discretizations,
Feb, 2012, Yukawa Institute, Kyoto, 2012.
This talk has 2 parts. The first is
an investigation of whether one can use one staggered
fermion to study the lightest four physical flavors (u,d,s,c). My conclusion
is that it is impractical.
The second part is an analysis of the symmetries, vacuum and pion spectrum
of two types of "staggered-Wilson fermions": that proposed by Adams having
2 light fermions, and that proposed by Hoelbling (and its variants)
having either 1 or 2 light fermions. I conclude that the former scheme has
a number of attractive properties, while the later suffers from rotation
breakdown in the continuum limit, unless one adds counterterms and fine tunes.
("Lattice QCD: successes, challenges and future outlook")
at Seoul National University, Korea, November 16, 2011.
at ECT* workshop on "Chiral Dynamics with Wilson fermions",
Oct. 24-28th, 2011, Trento, Italy.
This gives an introduction to Wilson Chiral Perturbation Theory
and the predictions for the phase structure at non-zero lattice
spacing, and presents some new work with student Max Hansen.
"Large-N QCD from simulations on a single site?"
at Brookhaven Nat. Lab, March 23rd, 2011.
I am an emiritus member of the executive committee of the
collaboration, which has obtained support from DOE
for computational resources and support.
I am a co-PI on a
(Scientific Discovery through Advanced computing---round 2) proposal
aimed at creating a national infrastructure for lattice gauge computing.
I am a member of the
Particle Data Group
, having co-authored the
mini-review on Lattice QCD
with Jack Laiho and Shoji Hashimoto.
Ex-UW graduate student Andrew Lytle and
I are calculating matching factors using
non-perturbative renormalization for improved
The project web page is here .
Teaching (recent plus some old classes)
- SPRING 2013:
Physical Applications of Group Theory.
- WINTER 2013:
Elementary Mathematical Physics, Part 2.
- AUTUMN 2012:
Elementary Mathematical Physics, Part 1.
- SPRING 2011:
Graduate QM (third quarter).
- WINTER 2011:
Graduate QM (second quarter).
- AUTUMN 2010:
Graduate QM (first quarter).
- WINTER 2009:
Physics 486 and 495:
Seminar on Current Problems in Physics and Senior Honors Seminar.
- AUTUMN 2008:
Graduate Mechanics (and an introduction to chaos).
US mail: Stephen R. Sharpe
Department of Physics
University of Washington
Seattle, WA 98195-1560
Office: B406 Physics-Astronomy Building
Phone: (206) 685-2395
FAX: (206) 543-5923 or 685-0635
Last modified: 12/2010