Jaehoon Leem

Neutral kaon mixing from new physics: matrix elements in

We present results for matrix elements of

N_f=2+1

\Delta S=2

lattice QCD

four-fermion operators arising generically in models of new physics. These are needed to constrain such models using the measured values of

Improved determination of B-K with staggered quarks

\varepsilon_K

Improved determination of BK with staggered quarks

and

Update on ɛK with lattice QCD inputs

\Delta M_K

Improved currents for B to D(*) ell nu form factors from Oktay-Kronfeld heavy quarks

. We use lattice QCD with 2+1 flavors of improved staggered fermions on lattices generated by the MILC collaboration. We extrapolate to the continuum from three lattice spacings ranging down to

Recent progress in calculation of B K using staggered fermions

a\approx 0.045\;

Improvement of heavy-heavy current for calculation of B̅ → D(*)lv̅ form factors using Oktay-Kronfeld heavy quarks

fm. Total errors are

Heavy-heavy current improvement for calculation of

\sim 5-6%