Measurement of the branching fraction $\mathcal{B}({\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-})$ at CDF

Abstract

We report an analysis of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ 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 ${\Lambda }_b^0\to {\Lambda }_c(2595{)}^{+}{\pi }^{-}$ (with ${\Lambda }_c(2595{)}^{+}\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-}$), ${\Lambda }_b^0\to {\Lambda }_c(2625{)}^{+}{\pi }^{-}$ (with ${\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-}$), ${\Lambda }_b^0\to {\Sigma }_c(2455{)}^{++}{\pi }^{-}{\pi }^{-}$ (with ${\Sigma }_c(2455{)}^{++}\to {\Lambda }_c^{+}{\pi }^{+}$), and ${\Lambda }_b^0\to {\Sigma }_c(2455{)}^0{\pi }^{+}{\pi }^{-}$ (with ${\Sigma }_c(2455{)}^0\to {\Lambda }_c^{+}{\pi }^{-}$) and measure the branching fractions relative to the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ branching fraction. We measure the ratio $\BR(Λ^0_b\rightarrow Λ^+_cπ^-π^+π^-) /\BR(Λ^0_b\rightarrow Λ^+_c π^-) = 3.04 \pm 0.33(\text{stat})^{+0.70}_{-0.55}(\text{syst})$ which is used to derive $\BR(Λ^0_b\rightarrow Λ^+_cπ^-π^+π^-)= (26.8^{+11.9}_{-11.2})\times10^{-3}$.

11 pages, 5 figures. Submitted Phys. Rev. D

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