  LHCb is one of the four experiments at the Large Hadron Collider (CERN),
dedicated to the study of b-hadrons. Throughout my research, I studied in
particular b-baryons which are abundantly produced at the LHCb. My habilitation
summarises the studies of fundamental properties of these particles within the
Standard Model. In particular, I discuss both lifetime and mass measurements.
This work is followed by a search of New Physics using a Lepton universality
test. Finally, I discuss my contribution to the upgrade detectors of the LHCb
experiment in particular those related to the calorimeter and the scintillator
fibre tracker.
