Implication of the HyperCP boson $X^0$ (214 MeV) in the flavour changing neutral current processes

Abstract

We analyze the inclusive $b(c)\to s(u){\mu }^{+}{\mu }^{-}$ and the exclusive $B(D^{+})\to K({\pi }^{+}){\mu }^{+}{\mu }^{-}$ flavour changing neutral current decays in the light of HyperCP boson $X^0$ of mass 214 MeV recently observed in the hyperon decay ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$. Using the branching ratio data of the above inclusive and exclusive decays, we obtain constraints on $g_1(h_1)$ and $g_2(h_2)$, the scalar and pseudo-scalar coupling constants of the $b-s-X^0(c-u-X^0)$ vertices.

Comments: 18 pages, 10 eps figures