# On Experimental Confirmation of the Corrections to the Fermi's golden rule

## TL;DR

This paper discusses potential deviations from Fermi's Golden Rule due to approximations, proposing experimental tests in neutral pion decay and positron annihilation to verify these corrections.

## Contribution

It introduces experimental approaches to test the corrections to Fermi's Golden Rule, which are not addressed in standard calculations.

## Key findings

- Proposes experimental searches in two-photon spectra from neutral pion decay.
- Suggests analyzing positron annihilation in nuclear beta decay.
- Aims to detect deviations from standard model predictions.

## Abstract

Standards calculations by the Fermi's Golden rule involve approximations. These approximations could lead to deviations from the predictions of the standard model as discussed in another paper. In this paper we propose experimental searches for such deviations in the two photon spectra from the decay of the neutral pion in the process $\phi \rightarrow \pi^{+} \pi^{-} \pi^{0}$ and in the annihilation of the positron from nclear $\beta$ decay.