Heavy-Meson-Hyperon Relative Parity and the Sign of the Coulomb Interference in $K^{-} - p$ Scattering

Two subtracted dispersion relations are applied at the same time to the study of the dependence of the real part of the

K^{-} - p

scattering amplitude at zero energy,

D_{-} (K)

, on the values of the coupling constants

{g_{Y}}^{2}

. The results, when compared with the existing experimental information, strongly indicate that the

K

meson is

p s - p s

(namely pseudoscalar with respect to both the

Λ

and the

Σ

hyperon) and that the sign of

D_{-} (ω)

at low energy is positive, giving therefore constructive Coulomb interference in the

K^{-} - p

elastic scattering.

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Heavy-Meson-Hyperon Relative Parity and the Sign of the Coulomb Interference inK−−pScattering