We present the first three-flavor lattice QCD calculations for D-->pilnu and D-->Klnu semileptonic decays. Simulations are carried out using ensembles of unquenched gauge fields generated by the MILC Collaboration. With an improved staggered action for light quarks, we are able to simulate at light quark masses down to 1/8 of the strange mass. Consequently, the systematic error from the chiral ...

We study s-wave pion-pion (ππ) scattering length in lattice QCD for pion masses ranging from 330 MeV to 466 MeV. In the “Asqtad” improved staggered fermion formulation, we calculate the ππ four-point functions for isospin I = 0 and 2 channels, and use chiral perturbation theory at next-to-leading order to extrapolate our simulation results. Extrapolating to the physical pion mass gives the scat...

The MILC collaboration computation of heavy-light decay constants is described. Results for fB, fBs , fD, fDsand their ratios are presented. These results are still preliminary, but the analysis is close to being completed. Sources of systematic error, both within the quenched approximation and from quenching itself, are estimated, although the latter estimate is rather crude. A sample of our r...

S. Basak,a A. Bazavov, b C. Bernard, c C. DeTar,d W. Freeman,b Steven Gottlieb∗,a U.M. Heller,e J.E. Hetrick, f J. Laiho,c L. Levkova,d J. Osborn,g R. Sugar,h and D. Toussaintb MILC Collaboration a Department of Physics, Indiana University Bloomington, IN 47405, USA b Physics Department, University of Arizona Tucson, AZ 85721, USA c Physics Department, Washington University St. Louis, MO 63130,...

The MILC collaboration computation of heavy-light decay constants is described. Results for f B , f Bs , f D , f Ds and their ratios are presented. These results are still preliminary, but the analysis is close to being completed. Sources of systematic error, both within the quenched approximation and from quenching itself, are estimated, although the latter estimate is rather crude. ?0:01 , wh...

In the requirement of “double carbon” goal, China has confronted lack a driving force for low-carbon transformation socioeconomic development, which requires comprehensive law and strategy support system supporting circular economy. this study, framework associated with multi-level quantitative index legislative economy (MILC) through entropy TOPSIS method was developed. It can not only reflect...

We show that it is now possible to fully determine the CKM matrix, for the first time, using lattice QCD. |Vcd|, |Vcs|, |Vub|, |Vcb| and |Vus| are, respectively, directly determined with our lattice results for form factors of semileptonic D → πlν, D → Klν, B → πlν, B → Dlν and K → πlν decays. The error from the quenched approximation is removed by using the MILC unquenched lattice gauge config...

The MILC Collaboration We study the eeects of diierent \fat link" actions for Kogut-Susskind quarks on avor symmetry breaking. Our method is mostly empirical-we compute the pion spectrum with diierent valence quark actions on common sets of sample lattices. Diierent actions are compared, as best we can, at equivalent physical points. We nd signiicant reductions in avor symmetry breaking relativ...

Lattice simulations of B → π lν decays are problematic in the low q2 region when the pion has to have large momentum in the lattice frame for a B meson at rest or moving slowly. The movingNRQCD formalism provides a way around this by giving an accurate discretization of a b quark moving at arbitrary velocity v, and therefore a B meson moving at high momentum in the lattice frame. Here we show r...

We study the transfer matrix for domain wall fermions to understand the origin and significance of oscillatory contributions to hadron correlation functions that arise for M >1. For a free particle in one space, one time, and one flavor dimension, the eigenmodes of the one-body operator appearing in the transfer matrix are calculated, and the role of the negative eigenmodes arising when M > 1 i...