Λ⁺_c polarimetry using the dominant hadronic mode

The polarimeter vector field for multibody decays of a spin-half baryon is introduced as a generalisation of the baryon asymmetry parameters. Using a recent amplitude analysis of the Λ⁺_c → pK⁻π⁺ decay performed at the LHCb experiment, we compute the distribution of the kinematic-dependent polarimeter vector for this process in the space of Mandelstam variables to express the polarised decay rate in a model-agnostic form. The obtained representation can facilitate polarisation measurements of the Λ⁺_c baryon and eases inclusion of the Λ⁺_c → pK⁻π⁺ decay mode in hadronic amplitude analyses.