# Searches for Light Exotics at LHCb

## TL;DR

This paper reports on LHCb's recent searches for light exotic particles, including lepton number violation and dark bosons, using data from Run I of the LHC at 7 and 8 TeV.

## Contribution

It presents new experimental searches for light exotics at LHCb, focusing on lepton number violation and low mass dark bosons, with analysis of Run I data.

## Key findings

- No evidence of lepton number violating decays found.
- Constraints set on the existence of low mass dark bosons.
- Results improve limits on light exotic particles.

## Abstract

We report on the latest direct searches for light exotics at LHCb, conducted during Run I of LHC. This proceedings are divided into two sections, the first part will cover the search for the lepton number violating decay ${B}\rightarrow {\pi^{+}\mu^{-}\mu^{-}}$ while the second part will cover the search for a low mass dark boson in the decay $B^0 \rightarrow K^{*0}\chi$, with $\chi \rightarrow \mu^+\mu^-$ and $K^{*0} \rightarrow K^+\pi^-$. The data used in these searches correspond to integrated luminosities of 1.0 and $2.0$ fb$^{-1}$ collected in $pp$ collisions at centre of mass energies of $\sqrt{s}=7$ and 8 TeV in $pp$ collisions with the LHCb detector.