  This paper is addressed to the analysis of the set of observables of the
bound-state beta-decay, which can be used for the experimental investigation of
contributions of i) interactions beyond the Standard Model (SM) and of ii) the
left-handed polarisation state of antineutrinos. For this aim we calculate the
branching ratio, probabilities and angular distributions of probabilities of
hydrogen in the hyperfine states and of the proton-electron pair in different
spinorial states, induced by left-handed and right-handed hadronic and leptonic
currents. The branching ratio of the bound-state beta-decay is calculated by
taking into account radiative corrections. We show that the probabilities of
the bound-state beta-decay can be good observables for experimental
investigations of contributions of interactions beyond the SM, whereas the
angular distributions of probabilities are good observables for experimental
searches of contributions of the left-handed polarisation state of
antineutrinos.
