Angular analysis of $\Lambda_{b} \rightarrow \Lambda \mu^{+}\mu^{-}$

The angular analysis of the rare baryon decay of $\Lambda_{b}\rightarrow \Lambda (\rightarrow p\pi^{-})\mu^{+}\mu^{-}$ in high $q^{2}$ is presented. The dataset that is used corresponds to an integrated luminosity of 5.0 fb$^{-1}$ of pp - collision data collected at centre-of-mass energies between 7 and 13 TeV by the LHCb detector in 2011, 2012, 2015 and 2016. Angular observables are determined using a moment analysis of the angular distribution.