Study of Lambda/c+ Cabibbo Favored Decays Containing a Lambda Baryon in the Final State

Abstract

Using data from the FOCUS experiment (FNAL-E831), we study the decay of ${\Lambda }_c^{+}$ baryons into final states containing a $\Lambda$ hyperon. The branching fractions of ${\Lambda }_c^{+}$ into $\Lambda {\pi }^{+}$, $\Lambda {\pi }^{+}{\pi }^{+}{\pi }^{-}$ and $\Lambda {\bar{K}}^0{K}^{+}$ relative to that into $p{K}^{-}{\pi }^{+}$ are measured to be $0.217\pm 0.013\pm 0.020$, $0.508\pm 0.024\pm 0.024$ and $0.142\pm 0.018\pm 0.022$, respectively. We also report new measurements of $\frac{\Gamma ({\Lambda }_c^{+}\to {\Sigma }^0{\pi }^{+})}{\Gamma ({\Lambda }_c^{+}\to \Lambda {\pi }^{+})}=1.09\pm 0.11\pm 0.19$, $\frac{\Gamma ({\Lambda }_c^{+}\to {\Sigma }^0{\pi }^{+}{\pi }^{+}{\pi }^{-})}{\Gamma ({\Lambda }_c^{+}\to \Lambda {\pi }^{+}{\pi }^{+}{\pi }^{-})}=0.26\pm 0.06\pm 0.09$ and $\frac{\Gamma ({\Lambda }_c^{+}\to \Xi (1690{)}^0(\Lambda {\bar{K}}^0)K^{+})}{\Gamma ({\Lambda }_c^{+}\to \Lambda {\bar{K}}^0{K}^{+})}=0.33\pm 0.10\pm 0.04$. Further, an analysis of the subresonant structure for the ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay mode is presented.

14 pages, 6 figures, 3 tables, Submitted to Physics Letter B