Measurement of the branching fraction $\mathcal{B}({\ensuremath{\Lambda}}_{b}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ at CDF

Measurement of the branching fraction $B (Λ_{b}^{0} \to Λ_{c}^{+} π^{-} π^{+} π^{-})$ at CDF

T. Aaltonen et al. (CDF Collaboration)

Phys. Rev. D 85, 032003 – Published 13 February 2012

Abstract

We report an analysis of the $Λ_{b}^{0} \to Λ_{c}^{+} π^{-} π^{+} π^{-}$ decay in a data sample collected by the CDF II detector at the Fermilab Tevatron corresponding to $2.4 {fb}^{- 1}$ of integrated luminosity. We reconstruct the currently largest samples of the decay modes $Λ_{b}^{0} \to Λ_{c} (2595)^{+} π^{-}$ (with $Λ_{c} (2595)^{+} \to Λ_{c}^{+} π^{+} π^{-}$ ), $Λ_{b}^{0} \to Λ_{c} (2625)^{+} π^{-}$ (with $Λ_{c} (2625)^{+} \to Λ_{c}^{+} π^{+} π^{-}$ ), $Λ_{b}^{0} \to Σ_{c} (2455)^{++} π^{-} π^{-}$ (with $Σ_{c} (2455)^{++} \to Λ_{c}^{+} π^{+}$ ), and $Λ_{b}^{0} \to Σ_{c} (2455)^{0} π^{+} π^{-}$ (with $Σ_{c} (2455)^{0} \to Λ_{c}^{+} π^{-}$ ) and measure the branching fractions relative to the $Λ_{b}^{0} \to Λ_{c}^{+} π^{-}$ branching fraction. We measure the ratio $B (Λ_{b}^{0} \to Λ_{c}^{+} π^{-} π^{+} π^{-}) / B (Λ_{b}^{0} \to Λ_{c}^{+} π^{-}) = 3.04 \pm 0.33 (stat)_{- 0.55}^{+ 0.70} (syst)$ which is used to derive $B (Λ_{b}^{0} \to Λ_{c}^{+} π^{-} π^{+} π^{-}) = ({26.8}_{- 11.2}^{+ 11.9}) \times 10^{- 3}$ .