FCNC processes of charmed hadrons with invisible scalar

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 D0→π0ν¯ν, we predict that the decay branching ratios of D+→π+S, Ds+→K+S, Λc→pS, Ξc0(+)→Σ0(+)S, and Ξc0→ΛS can be as large as 10.6,2.53,2.39,0.963,5.77, and 2.92×10−4 with mS≈1.1GeV, 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.