The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Rare K+→π+ℓ+ℓ− decays with physical mass light-quarks

11 Aug 2022, 11:50

20m

CP1-HSZ/0.001 (CP1-HSZ) - HS3 (CP1-HSZ)

Oral Presentation QCD in searches for physics beyond the Standard Model QCD in searches for physics beyond the Standard Model

Speaker

Ryan Hill (University of Edinburgh)

Description

$K^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$ is a highly suppressed decay mode in the Standard Model, and is therefore expected to be sensitive to new physics. In this talk, we present the first lattice calculation of the long-distance electromagnetic form factor $V$ at physical light-quark masses for this decay. Our calculation features an explicit GIM subtraction, with dynamical zMöbius quarks and Möbius domain-wall fermion sea-quarks. In order to improve upon the obtained result, we identify the particular challenges to overcome on the road towards a competitive physical-point lattice calculation and suggest routes forward.

Presentation materials

rhill_lattice2022.pdf