K0, D0, B0, and Bs0. These processes, which could be induced by a hypothetical doubly-charged scalar particle, do not conserve the lepton number. Assuming, as an example, that the mass of the doubly-charged particle is 1000 GeV, and using the upper bounds of the couplings, we calculate the branching ratios of different channels. For K0→h1+h2+e-e-, D0→h1-h2-e+e+, and Bd, s0→h1+h2+e-e-, it is of the order of 10-30, 10-32-10-29, and 10-33-10-28, respectively. Based on the experimental results for the D0→h1-h2-l1+l2+ channels, we also find the upper limit for the quantity \begin{document}$\frac{{{s_\Delta }{h_{ij}}}}{{M_\Delta ^2}}$\end{document}."> Doubly-charged scalar in four-body decays of neutral flavored mesons -
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