FCNC processes of charmed hadrons with invisible scalar

TL;DR

This paper investigates the potential for charmed hadron decays involving an invisible scalar particle via FCNCs, providing predictions for decay rates that could be tested in current and future experiments.

Contribution

It offers a model-independent analysis of FCNC processes with an invisible scalar in charmed hadrons and predicts decay branching ratios based on recent experimental bounds.

Findings

Predicted decay branching ratios up to 10.6% for certain channels.

Some decay modes are accessible to ongoing experiments like BES III, LHCb, and Belle II.

Branching ratios depend on the scalar mass around 1.1 GeV.

Abstract

We study the invisible scalar of $S$ in charmed meson and baryon decays with flavor-changing neutral currents (FCNCs) based on the model-independent effective Lagrangian between the quarks and invisible scalar. From the bounds of the coupling constants extracted from the recent BES III experiment on the decay of $D^{0}\to\pi^{0}\bar\nu\nu$, we predict that the decay branching ratios of $D^{+}\to\pi^{+}S$, $D_s^+\to K^+S$, $\Lambda_c\to pS$, $\Xi_c^{0(+)}\to \Sigma^{0(+)}S$, and $\Xi_c^0\to\Lambda S$ can be as large as $10.6,~2.53,~2.39,~0.963,~5.77$, and $2.92\times10^{-4}$ with $m_{_S}\approx 1.1~{\rm GeV}$, respectively. Some of these decay modes are accessible to the ongoing experiments, such as BES III, LHCb and Belle II, as well as the future ones, such as FCC-ee.