  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.

High Energy Physics - Experiment