We provide a 0.8%-accurate determination of ${V}_{cs}$ from combining experimental results for the differential rate $D\ensuremath{\rightarrow}K$ semileptonic decays with precise form factors that we determine lattice QCD. This is first time has been determined an accuracy allows its difference 1 to be seen. Our QCD calculation uses highly improved staggered quark (HISQ) action all valence quar...

We provide a 0.8%-accurate determination of ${V}_{cs}$ from combining experimental results for the differential rate $D\ensuremath{\rightarrow}K$ semileptonic decays with precise form factors that we determine lattice QCD. This is first time has been determined an accuracy allows its difference 1 to be seen. Our QCD calculation uses highly improved staggered quark (HISQ) action all valence quar...

Motivated by the recently improved results from the Fermilab Lattice and MILC Collaborations on the hadronic matrix elements entering Ms,d in B0 s,d–B̄ 0 s,d mixing, we determine the universal unitarity triangle (UUT) in models with constrained minimal flavour violation (CMFV). Of particular importance are the very precise determinations of the ratio |Vub|/|Vcb| = 0.0864 ± 0.0025 and of the angl...

Motivated by the recently improved results from the Fermilab Lattice and MILC Collaborations on the hadronic matrix elements entering ∆Ms,d in B 0 s,d−B̄ s,d mixing, we determine the Universal Unitarity Triangle (UUT) in models with Constrained Minimal Flavour Violation (CMFV). Of particular importance are the very precise determinations of the ratio |Vub|/|Vcb| = 0.0864 ± 0.0025 and of the angl...

The HPQCD collaboration has a program for determining the fundamental constants of the Standard Model Lagrangian from lattice QCD. The most accurate method of doing this uses the n f = 2 + 1 improved staggered MILC ensembles with chiral fitting and multi-loop perturbative renormalisation to connect to the continuum MS scheme. This program has already been very successful with the recent strong ...

Citation Walker-Loud, A. et al. " Light hadron spectroscopy using domain wall valence quarks on an asqtad sea. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We c...

We compute the leptonic decay constants f D þ , f D s , and f K þ and the quark-mass ratios m c =m s and m s =m l in unquenched lattice QCD using the experimentally determined value of f π þ for normalization. We use the MILC highly improved staggered quark ensembles with four dynamical quark flavors—up, down, strange, and charm—and with both physical and unphysical values of the light sea-quar...

A complete study of QCD on the lattice requires the numerical simulation of dynamical fermions. These Monte Carlo calculations are extremely computationally costly, since the effects of quarks must be included by first integrating out the fermion path integral, and then describing the resulting non-local dynamics of the fermion determinant. For a review of recent developments, see e.g. [1, 2]. ...

Static free energy of a quark-antiquark pair is a frequently used tool to study non-perturbatively the in-medium modification of inter-quark forces. It is calculated as the difference in the free energy of the system with static quarks and the same system without them, while the temperature remains constant. Due to colour symmetry such quantity contains the singlet and the octet contributions, ...

Non-Relativistic QCD (henceforth NRQCD) is a non-relativistic effective theory that models the strong interaction. We use this formulation to perform lattice simulations of the bound states of b quarks, known as the Υ spectrum. These simulations are performed on a range of gauge ensembles provided by the MILC collaboration that include three flavours of quark content one at the approximate mass...