# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
Home > Timetable > Session details > Contribution details

# Contribution Parallel

Seminarios 6+7
Weak Decays and Matrix Elements

# Including electromagnetism in K->pipi decay calculations

## Speakers

• Prof. Norman CHRIST

## Content

Because of the small size of the ratio $A_2/A_0$ of the $I=2$ to $I=0$ $K\to\pi\pi$ decay amplitudes (the $\Delta I=1/2$ rule) the effects of electromagnetism on $A_2$ may be a factor of 20 larger than given by a naive $O(\alpha)$ estimate. Thus, if future calculations of $A_2$ and $\varepsilon'/\varepsilon$ are to achieve 10% accuracy, these effects need to be included. Here we present the first steps toward including electromagnetism in a calculation of the standard model $K\to\pi\pi$ decay amplitudes using lattice QCD.

## Preferred track (if multiple tracks have been selected)

Weak Decays and Matrix Elements