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In the chiral unitary approach, we have studied the single Cabibbo-suppresseddecays $\Lambda_c\to pK^+K^-$ and $\Lambda_c \to p \pi^+\pi^-$ by taking intoaccount the $s$-wave meson-meson interaction as well as the contributions fromthe intermediate vectors $\phi$ and $\rho^0$. Our theoretical results for theratios of the branching fractions of $\Lambda_c\to p \bar{K}^{*0}$ and$\Lambda_c\to p \omega$ with respect to the one of $\Lambda_c\to p \phi$ are inagreement with the experimental data. Within the picture that the scalarresonances $f_0(500)$, $f_0(980)$, and $a_0(980)$ are dynamically generatedfrom the pseudoscalar-pseudoscalar interactions in $s$-wave, we have calculatedthe $K^+K^-$ and $\pi^+\pi^-$ invariant mass distributions respectively for thedecays $\Lambda_c\to pK^+K^-$ and $\Lambda_c\to p\pi^+\pi^-$. One can find abroad bump structure for the $f_0(500)$ and a narrow peak for the $f_0(980)$ inthe $\pi^+\pi^-$ invariant mass distribution of the decay $\Lambda_c\top\pi^+\pi^-$. For the $K^+K^-$ invariant mass distribution, in addition to thenarrow peak for the $\phi$ meson, there is an enhancement structure near the$K^+K^-$ threshold mainly due to the contribution from the $f_0(980)$. Both the$\pi^+\pi^-$ and $K^+K^-$ invariant mass distributions are compatible with theBESIII measurement. We encourage our experimental colleagues to measure thesetwo decays, which would be helpful to understand the nature of the $f_0(500)$,$f_0(980)$, and $a_0(980)$.

The scalar $f_0(500)$ and $f_0(980)$ resonances and vector mesons in the single Cabibbo-suppressed decays $\Lambda_c \to p K^+K^-$ and $p\pi^+\pi^-$