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

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## Finite-volume effects in a calculation of the rare Hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$

Aug 11, 2022, 12:30 PM
20m
CP1-HSZ/Ground-0.001 - HS3 (CP1-HSZ)

### CP1-HSZ/Ground-0.001 - HS3

#### CP1-HSZ

50
Oral Presentation QCD in searches for physics beyond the Standard Model

### Speaker

Felix Erben (University of Edinburgh)

### Description

The rare Hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$, potentially sensitive to new physics beyond the Standard Model, is currently being pursued in an exploratory calculation by the RBC/UKQCD collaboration. At the physical pion mass, intermediate $N \pi$ states lead to poles in lattice quantities, which need to be removed to extract the physical amplitude. We present the formalism to achieve this and comment on the role of tuning lattice volumes specifically to account for these intermediate states.

### Primary author

Felix Erben (University of Edinburgh)