Bailey, J., Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A. X., Evans, R. T., ...
We calculate the form factor f_+(q^2) for B-meson semileptonic decay in unquenched lattice QCD with 2+1 flavors of light sea quarks. We use Asqtad-improved staggered light quarks and a Fermilab...
Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A. X., Evans, R. T., Freeland, E. D., ...
We present the first lattice QCD calculation of the form factor for B-> D* l nu with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks (the MILC...
Baryon masses with improved staggered quarks (2007)
Bernard, C., Davies, C., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., ...
The MILC collaboration's simulations with improved staggered quarks are being extended with runs at a lattice spacing of 0.06 fm with quark masses down to one tenth the strange quark mass. We give a...
The 2+1 flavor topological susceptibility from the asqtad action at 0.06 fm (2007)
Bernard, C., Billeter, B., DeTar, C., Levkova, L., Gottlieb, Steven, Heller, U. M., ...
We report new data for the topological susceptibility computed on 2+1 flavor dynamical configurations with lattice spacing 0.06 fm, generated with the asqtad action. The topological susceptibility is...
The equation of state with nonzero chemical potential for 2+1 flavors (2007)
Bernard, C., Burch, T., DeTar, C., Levkova, L., Gottlieb, Steven, Heller, U. M., ...
We present results for the QCD equation of state with nonzero chemical potential using the Taylor expansion method with terms up to sixth order in the expansion. Our calculations are performed on...
Charm and bottom heavy baryon mass spectrum from lattice QCD with 2+1 (2007)
Na, Heechang, Gottlieb, Steven
We present results for the mass spectrum of charm and bottom heavy baryons, using MILC coarse lattice configurations with 2+1 flavors. Clover heavy quark propagators with the Fermilab interpretation...
QCD thermodynamics with 2+1 flavors at nonzero chemical potential (2007)
Bernard, C., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Levkova, L., ...
We present results for the QCD equation of state, quark densities and susceptibilities at nonzero chemical potential, using 2+1 flavor asqtad ensembles with $N_t=4$. The ensembles lie on a trajectory...
Status of the MILC light pseudoscalar meson project (2007)
Bernard, C., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Levkova, L., ...
We discuss the current status of our calculation of the physics of pi and K mesons using three dynamical flavors of improved staggered quarks. This year, we have a new ensemble with a lattice spacing...
Staggered Diquarks for the Singly Heavy Baryons (2007)
Gottlieb, Steven, Na, Heechang, Nagata, Kazuhiro
In the staggered fermion formulation of lattice QCD, we construct diquark operators to be embedded in singly heavy baryons. The group theoretical connections between the continuum and lattice...
Diquark Representations for Singly Heavy Baryons with Light Staggered Quarks (2007)
Gottlieb, Steven, Na, Heechang, Nagata, Kazuhiro
In the staggered fermion formulation of lattice QCD, we construct diquark operators which are to be embedded in singly heavy baryons. The group theoretical connections between continuum and lattice...
QCD equation of state with 2+1 flavors of improved staggered quarks (2006)
Bernard, C., Burch, T., DeTar, C., Gottlieb, Steven, Levkova, L., Heller, U. M., ...
We report results for the interaction measure, pressure and energy density for nonzero temperature QCD with 2+1 flavors of improved staggered quarks. In our simulations we use a Symanzik improved...
Low energy constants from the MILC Collaboration (2006)
Bernard, C., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Osborn, L. Levkova J., ...
Based on ongoing simulations, we update our results for low energy constants, decay constants, and light quark masses. The simulations employ three dynamical flavors of improved staggered quarks.
The QCD equation of state with asqtad staggered fermions (2006)
Bernard, C., Burch, T., DeTar, C., Gottlieb, Steven, Levkova, L., Heller, U. M., ...
We report on our result for the equation of state (EOS) with a Symanzik improved gauge action and the asqtad improved staggered fermion action at $N_t=4$ and 6. In our dynamical simulations with 2+1...
Heavy baryon mass spectrum from lattice QCD with 2+1 flavors (2006)
Na, Heechang, Gottlieb, Steven
We study the heavy baryon mass spectrum on gauge configurations that include 2+1 flavors of dynamical improved staggered quarks. A valence clover heavy quark is combined with two improved staggered...
Update on the physics of light pseudoscalar mesons (2006)
DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Levkova, L., ...
We present an update of the MILC investigation of the properties of light pseudoscalar mesons using three flavors of improved staggered quarks. Results are presented for the $\pi$ and $K$ leptonic...
Onium Masses with Three Flavors of Dynamical Quarks (2005)
Gottlieb, Steven, Levkova, L., DiPierro, M., El-Khadra, A., Menscher, D., Kronfeld, A. S., ...
We have greatly extended an earlier calculation of the charmonium spectrum on three flavor dynamical quark ensembles by using more recent ensembles generated by the MILC collaboration. The heavy...
More evidence of localization in the low-lying Dirac spectrum (2005)
Bernard, C., De Forcrand, Ph., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Jahn, O., ...
We have extended our computation of the inverse participation ratio of low-lying (asqtad) Dirac eigenvectors in quenched SU(3). The scaling dimension of the confining manifold is clearer and very...
The locality of the fourth root of staggered fermion determinant in the interacting case (2005)
Bernard, C., DeTar, C., Gottlieb, Steven, Heller, U., Hetrick, J. E., Levkova, L., ...
The fourth root approximation in LQCD simulations with dynamical staggered fermions requires justification. We test its validity numerically in the interacting theory in a renormalization group...
Predictions from Lattice QCD (2005)
Kronfeld, Andreas S., Allison, I. F., Aubin, C., Bernard, C., Davies, C. T. H., DeTar, C., ...
In the past year, we calculated with lattice QCD three quantities that were unknown or poorly known. They are the $q^2$ dependence of the form factor in semileptonic $D\to Kl\nu$ decay, the decay...
Update on pi and K Physics (2005)
Bernard, MILC Collaboration: C., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., Levkova, L., ...
We present an update of the MILC studies of the physics of light pseudoscalars using improved staggered fermions. New runs at lighter quark mass, as well as increased statistics for older sets, are...
The Equation of State for QCD with 2+1 Flavors of Quarks (2005)
Bernard, C., Burch, T., DeTar, C., Gottlieb, Steven, Heller, U. M., Hetrick, J. E., ...
We report results for the interaction measure, pressure and energy density for nonzero temperature QCD with 2+1 flavors of improved staggered quarks. In our simulations we use a Symanzik improved...
Charmed meson decay constants in three-flavor lattice QCD (2005)
Aubin, C., Bernard, C., DeTar, C., Di Pierro, M., Freeland, E. D., Gottlieb, Steven, ...
We present the first lattice QCD calculation with realistic sea quark content of the D^+ meson decay constant f_{D^+}. We use the MILC Collaboration's publicly available ensembles of lattice gauge...
Leptonic decay constants f_Ds and f_D in three flavor lattice QCD (2004)
Simone, J. N., Aubin, C., Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A. X., ...
We determine the leptonic decay constants in three flavor unquenched lattice QCD. We use O(a^2)-improved staggered light quarks and O(a)-improved charm quarks in the Fermilab heavy quark formalism....
The scaling dimension of low lying Dirac eigenmodes and of the topological charge density (2004)
Aubin, MILC Collaboration: C., Bernard, C., Gottlieb, Steven, Gregory, E. B., Heller, Urs M., Hetrick, J. E., ...
As a quantitative measure of localization, the inverse participation ratio of low lying Dirac eigenmodes and topological charge density is calculated on quenched lattices over a wide range of lattice...
Bernard, MILC Collaboration: C., Datta, S., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
Starting in 2001, the MILC Collaboration began a large scale calculation of heavy-light meson decay constants using clover valence quarks on ensembles of three flavor configurations. For the coarse...
Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD (2004)
Okamoto, M., Aubin, C., Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A. X., ...
We present results for form factors of semileptonic decays of $D$ and $B$ mesons in 2+1 flavor lattice QCD using the MILC gauge configurations. With an improved staggered action for light quarks, we...
Three Flavor QCD at High Temperatures (2004)
Burch, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We have continued our study of the phase diagram of high temperature QCD with three flavors of improved staggered quarks. We are performing simulations with three degenerate quarks with masses less...
Topological susceptibility with three flavors of staggered quarks (2004)
Aubin, C., Bernard, C., Billeter, Brian, DeTar, C., Gottlieb, Steven, Gregory, E., ...
As one test of the validity of the staggered-fermion fourth-root determinant trick, we examine the suppression of the topological susceptibility of the QCD vacuum in the limit of small quark mass....
Results for light pseudoscalars from three-flavor simulations (2004)
Aubin, MILC Collaboration: C., Bernard, C., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, Urs M., ...
We compute pseudoscalar meson masses and decay constants in partially quenched QCD with three dynamical flavors of improved staggered quarks. Fitting the lattice data to staggered chiral perturbation...
Semileptonic decays of $D$ mesons in three-flavor lattice QCD (2004)
Aubin, C., Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A., Gottlieb, Steven, ...
We present the first three-flavor lattice QCD calculations for $D\to \pi l\nu$ and $D\to K l\nu$ semileptonic decays. Simulations are carried out using ensembles of unquenched gauge fields generated...
Aubin, MILC Collaboration: C., Bernard, C., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
As part of our program of lattice simulations of three flavor QCD with improved staggered quarks, we have calculated pseudoscalar meson masses and decay constants for a range of valence quark masses...
QCD Thermodynamics with Three Flavors of Improved Staggered Quarks (2004)
Burch, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We report on a study of QCD thermodynamics with three flavors of quarks, using a Symanzik improved gauge action and the Asqtad O(a^2) improved staggered quark action. Simulations were carried out...
First determination of the strange and light quark masses from full lattice QCD (2004)
Bernard, C., Davies, C., DeTar, C., Gottlieb, Steven, Gray, A., ...
We compute the strange quark mass $m_s$ and the average of the $u$ and $d$ quark masses $\hat m$ using full lattice QCD with three dynamical quarks combined with experimental values for the pion and...
Light hadrons with improved staggered quarks: approaching the continuum limit (2004)
Aubin, C., Bernard, C., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We have extended our program of QCD simulations with an improved Kogut-Susskind quark action to a smaller lattice spacing, approximately 0.09 fm. Also, the simulations with a approximately 0.12 fm...
Di Pierro, Massimo, El-Khadra, Aida X., Gottlieb, Steven, Kronfeld, Andreas, Mackenzie, Paul, Okamoto, Masataka, ...
A quick review of the features of FermiQCD, a C++ library for fast development of parallel Lattice QCD applications. FermiQCD is fully Object Oriented and is based on MPI but, it required no...
Di Pierro, Massimo, El-Khadra, Aida X., Gottlieb, Steven, Kronfeld, Andreas S., Mackenzie, Paul B., Menscher, Damian P., ...
We present preliminary results for the D_s meson spectrum and decay constants in unquenched lattice QCD. Simulations are carried out with 2+1 dynamical quarks using gauge configurations generated by...
Results on improved KS dynamical configurations: spectrum, decay constants, etc (2003)
The MILC Collaboration has been producing ensembles of lattice configurations with three dynamical flavors for the past few years. There are now results for three lattice spacings for a variety of...
Properties of charmonium in lattice QCD with 2+1 flavors of improved staggered sea quarks (2003)
Di Pierro, Massimo, El-Khadra, Aida X., Gottlieb, Steven, Kronfeld, Andreas S., Mackenzie, Paul B., Menscher, Damian P., ...
We use the dynamical gluon configurations provided by the MILC collaboration in a study of the charmonium spectrum and psi leptonic width. We examine sea quark effects on mass splitting and on the...
Semileptonic decays of $D$ mesons in unquenched lattice QCD (2003)
Okamoto, Masataka, Di Pierro, Massimo, El-Khadra, Aida X., Gottlieb, Steven, Kronfeld, Andreas S., Mackenzie, Paul B., ...
We present our preliminary results for semileptonic form factors of $D$ mesons in unquenched lattice QCD. Simulations are carried out with $n_f=2+1$ dynamical quarks using gauge configurations...
Excited States in Staggered Meson Propagators (2003)
Bernard, MILC Collaboration:C., Burch, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We report on preliminary results from multi-particle fits to meson propagators with three flavors of light dynamical quarks. We are able to measure excited states in propagators with pion quantum...
The Phase Diagram of High Temperature QCD with Three Flavors of Improved Staggered Quarks (2003)
Burch, T., DeTar, C. E., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We report on progress in our study of high temperature QCD with three flavors of improved staggered quarks. Simulations are being carried out with three degenerate quarks with masses less than or...
Pion and kaon physics with improved staggered quarks (2003)
Aubin, MILC Collaboration: C., Bernard, C., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, Urs M., ...
We compute pseudoscalar meson masses and decay constants using staggered quarks on lattices with three flavors of sea quarks and lattice spacings $\approx 0.12$ fm and $\approx 0.09$ fm. We fit...
Quark Loop Effects in Semileptonic Form Factors for Heavy-Light Mesons (2003)
Bernard, C., DeTar, C., Gottlieb, Steven, Gregory, E., Heller, Urs, McNeile, C., ...
We present preliminary results of a determination of the semileptonic form factor for the decay of pseudoscalar heavy-light mesons to pseudoscalar light-light mesons in full QCD. In this preliminary...
Topological susceptibility with the improved Asqtad action (2003)
Bernard, C., DeGrand, T., DeTar, C., Gottlieb, Steven, Gregory, E., Hart, A., ...
Chiral perturbation theory predicts that in quantum chromodymamics light dynamical quarks suppress the topological (instanton) susceptibility. We investigate this suppression through direct numerical...
Lattice results with three quark flavours (2003)
There have been exciting advances recently in finite temperature calculations with three quark flavours and with non-zero chemical potential. The role of improved actions is explained and recent...
High-Precision Lattice QCD Confronts Experiment (2003)
Davies, C. T. H., Follana, E., Gray, A., Lepage, G. P., Mason, Q., Nobes, M., ...
We argue that high-precision lattice QCD is now possible, for the first time, because of a new improved staggered quark discretization. We compare a wide variety of nonperturbative calculations in...
Lattice calculation of $1^{-+}$ hybrid mesons with improved Kogut-Susskind fermions (2003)
Bernard, C., Burch, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We report on a lattice determination of the mass of the exotic $1^{-+}$ hybrid meson using an improved Kogut-Susskind action. Results from both quenched and dynamical quark simulations are presented....
A lattice study of $\Lambda_b$ semileptonic decay (2003)
Gottlieb, Steven, Tamhankar, Sonali
We present results from a lattice study of the semileptonic decay $\Lambda_b \to \Lambda_c l \nu_l $. We use $O(a^2, \alpha_s a^2)$ improved quenched lattices of the MILC collaboration, with lattice...
Exotic hybrid mesons from improved Kogut-Susskind fermions (2003)
C. Bernard, T. Burch, E. B. Gregory, D. Toussaint, C. Detar, J. Osborn, ...
We summarize our determination of the mass of the exotic 1 hybrid meson using an improved Kogut-Susskind action. We show results from both quenched and dynamical quark simulations and compare with...
Charmonium with three flavors of dynamical quarks (2002)
Di Pierro, Massimo, El-Khadra, Aida X., Gottlieb, Steven, Kronfeld, Andreas S., Mackenzie, Paul B., Menscher, Damian P., ...
We present a calculation of the charmonium spectrum with three flavors of dynamical staggered quarks from gauge configurations that were generated by the MILC collaboration. We use the Fermilab...
Light Hadron Properties With Improved Staggered Quarks (2002)
C. Bernard, T. Burch, T. Degrand, C. Detar, Steven Gottlieb, E. B. Gregory, ...
n lattices from these simulations were reported in other talks at this conference [3]. Before exploring more technical points, we would like to emphasize that the big picture of hadronic physics...
The QCD spectrum with three quark avors (2002)
Claude Bernard, Tom Burch, Kostas Orginos, Thomas A. Degrand, Carleton Detar, Saumen Datta, ...
We present results from a lattice hadron spectrum calculation using three avors of dynamical quarks | two light and one strange, and quenched simulations for comparison. These simulations were done...
Heavy-light meson decay constants with N_f=3 (2002)
Bernard, MILC Collaboration: C., Burch, T., Datta, S., DeTar, C., Gottlieb, Steven, Gregory, E., ...
During the past year the MILC Collaboration has continued its study of heavy-light meson decay constants with three dynamical quarks. Calculations have been extended to a second lattice spacing of...
Heavy-light meson decay constants with N f = 3 (2002)
C. Bernard, T. Burch, S. Datta, C. Detar, Steven Gottlieb, R. Sugar
INTRODUCTION We are extending a calculation of heavy-light meson decay constants with three avors of dynamical quarks that was begun last year [1]. In addition to increasing statistics on some runs,...
Exotic hybrid mesons from improved Kogut-Susskind fermions (2002)
Bernard, C., Burch, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., ...
We summarize our measurement of the mass of the exotic $1^{-+}$ hybrid meson using an improved Kogut-Susskind action. We show results from both quenched and dynamical quark simulations and compare...
High temperature QCD with three flavors of improved staggered quarks (2002)
Burch, T., DeTar, C. E., Gottlieb, Steven, Gregory, Eric, Heller, U. M., ...
We present an update of our study of high temperature QCD with three flavors of quarks, using a Symanzik improved gauge action and the Asqtad staggered quark action. Simulations are being carried out...
Chiral Logs With Staggered Fermions (2002)
C. Bernard, C. Detar, Steven Gottlieb, Urs M. Heller, K. Orginos, D. Toussaint
t O(a ). We use the word avor" for dierent staggered elds; lattice avor symmetry is exact for equal masses. MILC's improved staggered (a -tad") simulations [3] use three elds (u; d; s") and reduce...
Chiral logs with staggered fermions (2002)
Aubin, C., Bernard, C., DeTar, C., Gottlieb, Steven, Heller, Urs M., Orginos, K., ...
We compute chiral logarithms in the presence of "taste" symmetry breaking of staggered fermions. The lagrangian of Lee and Sharpe is generalized and then used to calculate the logs in $\pi$ and $K$...
Topological susceptibility with the improved Asqtad action (2002)
Bernard, MILC Collaboration: C., Burch, T., DeGrand, T. A., DeTar, C. E., Gottlieb, Steven, Gregory, E., ...
As a test of the chiral properties of the improved Asqtad (staggered fermion) action, we have been measuring the topological susceptibility as a function of quark masses for 2 + 1 dynamical flavors....