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.
Categories: hep-ex