# New Physics Suggested by Atomki Anomaly

## TL;DR

This paper explores various extensions of the Standard Model to explain the Atomki anomaly, proposing new bosons around 17 MeV and detailing possible BSM frameworks with enlarged Higgs or gauge sectors.

## Contribution

It introduces multiple BSM scenarios with spin-0 and spin-1 bosons that can account for the Atomki anomaly, expanding theoretical possibilities.

## Key findings

- Both spin-0 and spin-1 solutions are viable.
- Proposed BSM models include enlarged Higgs and gauge sectors.
- Models can accommodate the observed 17 MeV boson in Beryllium decay.

## Abstract

We consider several extensions of the Standard Model (SM) which can explain the anomalies observed by the Atomki collaboration in the decay of excited states of Beryllium via a new boson with a mass around 17 MeV yielding $e^+e^-$ pairs. We show how both spin-0 and 1 solutions are possible and describe the Beyond the SM (BSM) scenarios that can accommodate these. They include BSM frameworks with either an enlarged Higgs, or gauge sector, or both.