Semileptonic, B → π lν, decays are studied on the MILC dynamical configurations using NRQCD heavy and Asqtad light quarks. We work with light valence quark masses ranging between ms and ms/8. Preliminary simple linear chiral extrapolations have been carried out for form factors f and f ⊥ at fixed Eπ. The chirally extrapolated results for the form factors f+(q 2) and f0(q 2) are then fit to the ...

The MILC Collaboration: C. Bernard , S. Datta , C. DeTar , Steven Gottlieb , E.B. Gregory , U.M. Heller f , J. Osborn , R.L. Sugar g and D. Toussaint e Department of Physics, Washington University, St. Louis, MO 63130, USA Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany Physics Department, University of Utah, Salt Lake City, UT 84112, USA Department of Physics, Indiana Un...

We present an exploratory study of the thermodynamics of N f = 3 QCD with an improved staggered fermions using the QCDOC supercomputer. We use a p4 action with MILC-style smeared links (Fat 7). Some details of the implementation of the p4 action on QCDOC are discussed and performance benchmarks are given. We show preliminary results for the quark mass dependence of the pseudo-critical temperatu...

We describe the first lattice determination of the strong coupling constant with 3 flavors of dynamical quarks. The method follows previous analyses in using a perturbative expansion for the plaquette and Upsilon spectroscopy to set the scale. Using dynamical configurations from the MILC collaboration with 2+1 flavors of dynamical quarks we are able to avoid previous problems of haivng to extra...

We present results of an exploratory study of singlet scalar states in unquenched QCD using both glueball and meson operators. Results for non-singlet non-strange scalar mesons are also presented. We use Asqtad improved staggered fermions and gauge configurations generated by the MILC collaboration at lattice spacings of .12 and .09 fm. In this formulation, the glueball mass is not significantl...

The running coupling of the Wilson fermon(JLQCD/CP-PACS) and that of Kogut-Susskind(KS) fermion(MILC) are measured in the lattice Landau gauge QCD in MOM scheme. The quark propagator of the KS fermion is also measured and we find that it is infrared vanishing, which implies that quarks are confined. The renormalization factor of the running coupling and the tadpole renormalization define the sc...

We present an exploratory study of the thermodynamics of N f ¡ 3 QCD with an improved staggered fermions using the QCDOC supercomputer. We use a p4 action with MILC-style smeared links (Fat 7). Some details of the implementation of the p4 action on QCDOC are discussed and performance benchmarks are given. We show preliminary results for the quark mass dependence of the pseudo-critical temperatu...

The MILC collaboration has been performing realistic simulations of full QCD with 2+1 flavors of improved staggered quarks. Our simulations allow for controlled continuum and chiral extrapolations. I present results for the light pseudoscalar sector: masses and decay constants, quark masses and GasserLeutwyler low-energy constants. In addition I will present some results for heavy-light mesons,...

We present a calculation of the kaon B parameter B(K) using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC Collaboration with N(f)=2+1 light flavors. To control discretization errors, we use four different lattice spacings ranging down to a≈0.045 fm. The chiral and continuum extrapolations are done using SU(2) staggered chiral perturbation theo...

It has been argued recently that diquarks, a pair of quarks in the anti-triplet representation of SU(3) color, are important building blocks of baryons. The assumption that the scalar diquark is tightly bound seems to be nicely accommodated by experimental data. In this paper I attempt to extract phenomenological properties of diquarks from lattice QCD calculations. In particular, I use the MIL...