Stefan Meinel

Calculation of B-0 -> K*(0)mu(+)mu(-) and B-s(0) -> phi mu(+)mu(-) Observables Using Form Factors from Lattice QCD

We calculate the differential branching fractions and angular distributions of the rare decays B-0 -> K*(0)mu(+)mu(-) and B-s(0) -> phi mu(+)mu(-), using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the K* or phi recoils softly; there, the newly available form factors are most precise and the nonlocal matrix elements can be included via an operator product expansion. Our results for the differential branching fractions calculated in the standard model are higher than the experimental data. We consider the possibility that the deviations are caused by new physics and perform a fit of theWilson coefficients C-9 and C-9 to the experimental data for multiple B-0 -> K*(0)mu(+)mu(-) and B-s(0) -> phi mu(+)mu(-) observables. In agreement with recent results from complementary studies, we obtain C-9 - C-9(SM) = -1.0 +/- 0.6 and C-9 = 1.2 +/- 1.0, whose deviations from zero would indicate the presence of nonstandard fundamental interactions.

Lattice QCD calculation of form factors describing the rare decays B →k*+- and Bs →φ+-

The rare decays

Λb→Λℓ+ℓ- form factors and differential branching fraction from lattice QCD

B^0 to K^{*0} mu^+ mu^-

Quarkonium at nonzero isospin density

and

Nucleon form factors with light Wilson quarks

B_s to phi mu^+ mu^-

Computing the nucleon charge and axial radii directly at Q 2 = 0 in lattice QCD

are now being observed with enough precision to test Standard Model predictions. A full understanding of these decays requires accurate determinations of the corresponding hadronic form factors. Here we present results of lattice QCD calculations of the

Λb→pl⁻ν¯l form factors from lattice QCD with static b quarks

B to K^*

Flavor physics with Λb baryons

and

ππ P-wave resonant scattering from lattice QCD

B_s to phi

A study of the radiative transition ππ → πγ∗ with lattice QCD

form factors; we also determine the form factors relevant for the tree-level decays