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

TL;DR

This paper investigates how the recently observed HyperCP boson $X^0$ could influence flavor-changing neutral current decays in B and D mesons, deriving constraints on its coupling constants from experimental data.

Contribution

It provides the first analysis of the HyperCP boson's impact on specific meson decay processes and constrains its coupling constants based on decay data.

Findings

Constraints on scalar and pseudo-scalar couplings of $X^0$

Implications for flavor-changing neutral current processes

Potential guidance for future experimental searches

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.