Bottomed baryon decays with invisible Majorana fermions

We study the invisible Majorana fermions of $\chi$ in bottomed baryon decays with flavor-changing neutral currents (FCNCs) based on the model-independent effective Lagrangian between the quarks and invisible particles. From the bounds of the coupling constants extracted from the experiments, we examine the decay branching ratios of ${\mathrm{\Lambda }}_b\to \mathrm{\Lambda }\chi \chi$, ${\mathrm{\Xi }}_b^{0(-)}\to {\mathrm{\Xi }}^{0(-)}\chi \chi$, ${\mathrm{\Lambda }}_b\to n\chi \chi$, $\Xi_b^{-}\to \Sigma^{-} \chi\chi$,$\Xi_b^{0}\to \Sigma^{0} \chi\chi$,and$\Xi_b^{0}\to \Lambda \chi\chi$,whichcanbeaslargeas$6.3,~9.2,~5.7,~5.8,~2.7$,and$1.0\times10^{-5}$for$m_\chi=2$ GeV, respectively. Some of these decays are accessible to the future experimental searches, such as Belle II.