### Speaker

Mr
Ziyuan Bai
(Columbia)

### Description

We demonstrate the lattice QCD calculation of the long distance contribution
to $\epsilon_K$. Due to the singular, short-distance structure of
$epsilon_K$, we must perform a short-distance subtraction and introduce a
corresponding subtraction term determined from perturbation theory, which
we calculate at Next Leading Order (NLO). We perform the calculation on a
$24^3 \times 64$ lattice with a pion mass of 329 MeV. This work is a
complete calculation, which includes all connected and disconnected
diagrams.

### Primary author

Mr
Ziyuan Bai
(Columbia)