# Measurement of the decays ${\Lambda }_{c}\to \Sigma \pi \pi$ at Belle

17 December 2018

Abstract: We report measurements of the branching fractions of the decays ${\Lambda }_{c}^{+}\to {\Sigma }^{+}{\pi }^{-}{\pi }^{+}$, ${\Lambda }_{c}^{+}\to {\Sigma }^{0}{\pi }^{+}{\pi }^{0}$ and ${\Lambda }_{c}^{+}\to {\Sigma }^{+}{\pi }^{0}{\pi }^{0}$ relative to the reference channel ${\Lambda }_{c}^{+}\to p{K}^{-}{\pi }^{+}$. The analysis is based on the full data sample collected at and near the $\Upsilon \left(4S\right)$ resonance by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{-}$ collider, corresponding to an integrated luminosity of $711\text{}\text{}{\mathrm{fb}}^{-1}$. We measure $B\left({\Lambda }_{c}^{+}\to {\Sigma }^{+}{\pi }^{-}{\pi }^{+}\right)/\phantom{\rule{0ex}{0ex}}B\left({\Lambda }_{c}^{+}\to p{K}^{-}{\pi }^{+}\right)=0.719±0.003±0.024$, $B\left({\Lambda }_{c}^{+}\to {\Sigma }^{0}{\pi }^{+}{\pi }^{0}\right)/B\left({\Lambda }_{c}^{+}\to p{K}^{-}{\pi }^{+}\right)=0.575±0.005±0.036$ and $B\left({\Lambda }_{c}^{+}\to {\Sigma }^{+}{\pi }^{0}{\pi }^{0}\right)/B\left({\Lambda }_{c}^{+}\to p{K}^{-}{\pi }^{+}\right)=0.247±0.006±0.019$. The listed uncertainties are statistical and systematic, respectively.

Published in: Physical Review D 98 (2018)