Andreas S. Kronfeld's Home Page
Most of my research
focuses on lattice gauge theory, particularly on the quest to make
reliable calculations of hadronic matrix elements. These are needed, in
particular, to interpret experiments studying the B meson at Fermilab's Tevatron, KEK's KEK-B, and SLAC's PEP-II
accelerators. A large part of this effort is devoted towards developing
and improving methodology (reviewed here),
but it is also important to do calculations of broad interest (reviewed here).
As an outgrowth of this work, I have been involved some collaborative
efforts between theorists and experimentalists, organizing a workshop on B Physics at the Tevatron,
and participating in CERN's CKM
Unitarity Triangle Workshop.
In recent years I
have also been involved in studies of the physics potential of
linear e+e- colliders.
Curriculum vita and
list of publications
(also available as one sequential list,
inSPIRE HEP), as of October 2012.
Briefly, I received my Ph.D. from
Cornell University in
1985, after which I was a post-doc at DESY
for three years. I have been at Fermilab
Lattice QCD and
The Golden Era of Lattice QCD
In 2003, a
collaboration of Collaborations discovered that lattice QCD with 2+1
flavors of sea quarks agreed with experiment for a wide variety of
development, among other things, led to a vigorous dialogue about the
theoretical foundations of the way the sea quarks are treated in this paper
(namely, with rooted, staggered fermions).
In 2007 I wrote a summary of the arguments in favor, a
list of recent theoretical papers, and a refutation a specific claims
we then aimed to predict several other gold-plated quantities:
These results were
later confirmed by several experimental measurements.
This development is summarized in:
measurements of one of these quantities—the decay constant of the
Ds meson—improved, the measurement deviated from
(of another group)
The D+, K, and π decay constants (which are
harder to control) remain in agreement.
The deviation can be interpreted as a signal of non-Standard physics:
discrepancy calls for other lattice groups to compute the
Ds decay constant with other methods, and for the
experimental measurements to be improved.
Review Papers and
Review Talks at Conferences
that may be of interest:
talks aimed at experimenters:
Foundations of Heavy Quarks on the Lattice
It is a
challenge to treat the heavy b quark in lattice gauge theory,
because its mass is above the ultraviolet cutoff of the lattice. We
have developed a framework for solving the problem, marrying aspects of
conventional lattice QCD with the simplifications of the heavy-quark
A suite of
computer codes for the radiative corrections computed in the second- and
third-to-last papers is available at LatHQ2QCD.
A by-product of the
second paper was a proof that the pole mass of a quark is
infrared-finite and gauge-invariant, order by order in perturbative QCD.
See The Perturbative Pole Mass in QCD.
We have also tested
how well perturbation theory works for short-distance coefficients in Perturbative
Calculation of O(a) Improvement Coefficients, with Harada,
Hashimoto, and Onogi.
Phenomenological Applications (in the Quenched Approximation)
theoretical developments were informed by and fed into a series of
papers on quantities of phenomenological interest
calculations omit sea quarks (aka the quenched approximation) and
are obsolete quantitatively, they set a standard for thorough analysis of
all the uncertainties that arise in lattice gauge theory.
Determination of the Strong Coupling Constant from the Charmonium
Spectrum with El-Khadra, Hockney, and Mackenzie
and D Meson Decay Constants in Lattice QCD with El-Khadra,
Mackenzie, Ryan, and Simone
QCD Calculation of B → D l nu Form Factors at Zero
Recoil with Hashimoto, El-Khadra, Mackenzie, Ryan, and Simone
of Lambda-bar and lambda_1 with Lattice QCD with Simone
Semileptonic Decays B → pi l nu and D → pi l
nu from Lattice QCD with El-Khadra, Mackenzie, Ryan, and Simone
Calculation of the Zero Recoil Form Factor in B → D*l
nu: Toward a Model Independent Determination of |Vcb|
with Hashimoto, Mackenzie, Ryan, and Simone
Here are two
papers that are also of interest to Standard Model phenomenology, but
which hinge more on the property of light quarks
completeness, here are some results that have been presented only at
You can find out
more about some of my collaborators from their web pages: Aida El-Khadra, Paul Mackenzie, Tetsuya Onogi, Sinead Ryan, and Jim Simone.
Since 2004 I
have been a delegate on the Organizing Commmittee of the
Study of the Physics and Detectors for Future
e+e- Colliders (WWS-OC).
Earlier I was a convener (for top quarks, and the Higgs bosons) in the
North American study.
With Slawomir Tkaczyk I coordinated a local study within Fermilab for
Director Michael Witherell.
Report of study
commissioned by Fermilab Directorate
My talks on the
Theoretical Physics Group
Fermi National Accelerator Laboratory
P.O. Box 500
U. S. A.
840-3753, fax: (630) 840-5435
A picture of me in my office.
From October 10 to
December 23, 1995, I visited Nordita.
From February 1 to
April 30, 2001, I visited Tsukuba
Other Kronfelds on the Internet
Author: Andreas Kronfeld
Revised: 19 March 2008
Created: November 1995