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We consider which is the maximum information measurable from the decaydistributions of polarised baryon decays via amplitude analysis in the helicityformalism. We focus in particular on the analytical study of the $\Lambda^+_c\to pK^-\pi^+$ decay distributions, demonstrating that the full information onits decay amplitudes can be extracted from its distributions, allowing asimultaneous measurement of both helicity amplitudes and the polarisationvector. This opens the possibility to use the $\Lambda^+_c \to pK^-\pi^+$ decayfor applications ranging from New Physics searches to low-energy QCD studies,in particular its use as absolute polarimeter for the $\Lambda^+_c$ baryon.This result is valid as well for baryon decays having the same spin structureand it is cross-checked numerically by means of a toy amplitude fit with MonteCarlo pseudo-data.

Extracting maximum information from polarised baryon decays via amplitude analysis: the $\Lambda^+_c \to pK^-\pi^+$ case