Charmless $b$-meson and $b$-baryon decays at LHCb

Recent measurements of charmless $b$-hadron decays using 3 fb$^{−1}$ of $p p$ collisions at $\sqrt s = 7$ and 8 TeV, collected by the LHCb experiment, are presented. A search is performed for $\Lambda_{b}$ and $\Xi^{0}_{b}$ decays to $\Lambda h^{+}h^{'−}$ final states. The decays $\Lambda_{b} \rightarrow \Lambda K^{+}\pi^{-}$ and $\Lambda_{b} \rightarrow \Lambda K^{+}K^{−}$ are observed for the first time, and their branching fractions and CP asymmetries are measured. Evidence is seen for the $\Lambda_{b} \rightarrow \pi^{+}\pi^{-}$ channel, and limits are set on the branching fractions of the $\Xi^{0}_{b} \rightarrow \Lambda h^{+}h^{'-}$ decay modes. The decay $\Lambda_{b} \rightarrow \Lambda \phi$ is observed for the first time, and its branching fraction and $T-$ odd triple-product asymmetries are measured. A search is performed for the decay $B^{+}_{c} \rightarrow p \bar{p} \pi^{+}$ . No signal is found, and an upper limit is set on the product of the branching fraction with the ratio of $B^{+}_{c}$ and $B^{+}$ production cross-sections.