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Flavor physics with $Λ_b$ baryons

At the LHC, bottom baryons are being produced in unprecedented quantities, which opens up a new field for flavor physics. For example, the decay $Λ_b \to p μ^- \barν$ can be used to obtain a novel determination of the CKM matrix element $|V_{ub}|$, and the decay $Λ_b \to Λμ^+ μ^-$ probes the weak interactions at the loop level. The first lattice calculations of the relevant $Λ_b \to p$ and $Λ_b \to Λ$ form factors have recently been performed using domain-wall light quarks and static $b$ quarks. To further reduce the theoretical uncertainty, one has to go beyond the static approximation. Here I present new calculations of $Λ_b \to p$, $Λ_b \to Λ$, and $Λ_b \to Λ_c$ form factors using a relativistic heavy-quark action.