# Selection rules for light-by-light scattering in strong magnetic field

## TL;DR

This paper derives selection rules for light-by-light scattering in strong magnetic fields, considering CP and momentum conservation along with complex photon dispersion laws.

## Contribution

It introduces specific selection rules for photon interactions in magnetic fields, accounting for nontrivial dispersion relations of photon modes.

## Key findings

- Selection rules based on CP and momentum conservation.
- Inclusion of nontrivial photon dispersion laws.
- Application to strong magnetic field scenarios.

## Abstract

Selection rules that follow from CP- and 4-momentum conservation are listed for head-on light-by-light scattering in strong magnetic field taking into account nontrivial dispersion laws of different photon eigenmodes.