Rare $b$-hadron decays at LHCb

Rare $b$-hadron decays are sensitive probes of New Physics, as new particles can give significant contributions on physics observables. Searches for phenomena beyond the Standard Model are focused on the study of branching fractions, CP asymmetries and angular observables of rare b-hadron decays. During Run 1 and Run 2 of the LHC, the LHCb experiment has collected large samples of these kind of decays. The latest measurements help to constrain the size of right-handed currents in extensions of the Standard Model.