Measurement of Singly Cabibbo Suppressed Decays $\Lambda_c^{+}\to p\pi^{+}\pi^{-}$ and $\Lambda_c^{+}\to pK^{+}K^{-}$
2016
Using 567 $pb^{-1}$ of data collected with the BESIII detector at a center-of-mass energy of $\sqrt{s}=$ 4.599 $GeV$, near the $\Lambda_{c}^{+}\Lambda_{c}^{-}$ threshold, we study the singly Cabibbo-suppressed decays $\Lambda_c^{+}\to p\
pi^{+}\
pi^{-}$ and $\Lambda_c^{+}\to pK^{+}K^{-}$. By normalizing with respect to the Cabibbo-favored decay $\Lambda_c^{+}\to pK^{-}\
pi^{+}$, we obtain ratios of
branching fractions: $\frac{\mathcal{B}(\Lambda_c^{+}\to p\
pi^{+}\
pi^{-})}{\mathcal{B}(\Lambda_c^{+}\to pK^{-}\
pi^{+})}$ = $(6.70 \pm 0.48 \pm 0.25)\%$, $\frac{\mathcal{B}(\Lambda_c^{+}\to p\phi)}{\mathcal{B}(\Lambda_c^{+}\to pK^{-}\
pi^{+})}$ = $(1.81 \pm 0.33 \pm 0.13)\%$, and $\frac{\mathcal{B}(\Lambda_c^{+}\to pK^{+}K^{-}_{\text{non-}\phi})}{\mathcal{B}(\Lambda_c^{+}\to pK^{-}\
pi^{+})}$ = $(9.36 \pm 2.22 \pm 0.71)\times10^{-3}$, where the uncertainties are statistical and systematic, respectively. The absolute
branching fractionsare also presented. Among these measurements, the decay $\Lambda_c^{+}\to p\
pi^{+}\
pi^{-}$ is observed for the first time, and the precision of the
branching fractionfor $\Lambda_c^{+}\to pK^{+}K^{-}_{\text{non-}\phi}$ and $\Lambda_c^{+}\to p\phi$ is significantly improved.
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