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 $Λ^+_c$ baryons into final states containing a $Λ$ hyperon. The branching fractions of $Λ^+_c$ into $Λπ^+$, $Λπ^+ π^+ π^-$ and $Λ\bar{K} ^0 K^+$ relative to that into $pK^-π^+$ 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 $\frac{Γ(Λ^+_c \to Σ^0 π^+)}{Γ(Λ^+_c \to Λπ^+)} = 1.09 \pm 0.11 \pm 0.19$, $\frac{Γ(Λ^+_c \to Σ^0 π^+π^+ π^-)}{Γ(Λ^+_c \to Λπ^+ π^+ π^-)} = 0.26 \pm 0.06 \pm 0.09$ and $\frac{Γ(Λ^+_c \to Ξ(1690)^0(Λ\bar{K} ^0) K^+)}{Γ(Λ^+_c \to Λ\bar{K} ^0 K^+)} = 0.33 \pm 0.10 \pm 0.04$. Further, an analysis of the subresonant structure for the $Λ^+_c \to Λπ^+π^+π^-$ decay mode is presented.