Laurent Lellouch

High-precision scale setting in lattice QCD

A bstractScale setting is of central importance in lattice QCD. It is required to predict dimensional quantities in physical units. Moreover, it determines the relative lattice spacings of computations performed at different values of the bare coupling, and this is needed for extrapolating results into the continuum. Thus, we calculate a new quantity, w0, for setting the scale in lattice QCD, which is based on the Wilson flow like the scale t0 (M. Luscher, JHEP 08 (2010) 071). It is cheap and straightforward to implement and compute. In particular, it does not involve the delicate fitting of correlation functions at asymptotic times. It typically can be determined on the few per-mil level. We compute its continuum extrapolated value in 2 + 1-flavor QCD for physical and non-physical pion and kaon masses, to allow for mass-independent scale setting even away from the physical mass point. We demonstrate its robustness by computing it with two very different actions (one of them with staggered, the other with Wilson fermions) and by showing that the results agree for physical quark masses in the continuum limit.

Sigma term and strangeness content of octet baryons

By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark-mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our Nf = 2 + 1 lattice ensembles include pion masses

K{sup 0}-K{sup 0} mixing beyond the standard model and CP-violating electroweak penguins in quenched QCD with exact chiral symmetry

We present results for the

Finite-size scaling of vector and axial current correlators

\ensuremath{\Delta}S=2

Standard model matrix elements for neutral B meson mixing and associated decay constants

matrix elements which are required to study neutral kaon mixing in the standard model (SM) and beyond . We also provide leading chiral order results for the matrix elements of the electroweak penguin operators which give the dominant

Non-perturbative renormalization of the quark condensate in Ginsparg-Wilson regularizations

\ensuremath{\Delta}I=3/2

The Isgur-Wise function from the lattice

contribution to direct

Quenched heavy-light decay constants

CP

How small can the light quark masses be

violation in

Phenomenology from lattice QCD

K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}