  We consider the existence of the state X^0 (214 MeV) in Sigma^+ -> p mu^+
mu^- decay found by the HyperCP collaboration. We assume that a fundamental
spin zero boson X^0 coupled to quarks leads to flavor changing s -> d X^0
process. We estimate the scalar and pseudoscalar coupling constants by
considering Sigma^+ -> p X^0 and K^+ -> pi^+ X^0 processes, and find that
pseudoscalar coupling dominates. We then evaluate the branching ratios for K_L
-> pi^0 pi^0 X^0, pi^+ pi^- X^0 and Omega^- -> Xi^- X^0 decays. All these rates
are found to be in the measurable ranges. We also comment on X^0 coupling to
muons and constraints from muon g-2.
