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 → pμ^-ν can be used to obtain a novel determination of the CKM matrix element |Vub|, and the decay Λ_b → Λμ⁺μ^- probes the weak interactions at the loop level. The first lattice calculations of the relevant Λ_b → p and Λ_b → 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 →p, Λ_b →Λ, and Λ_b → Λ_c form factors using a relativistic heavy-quark action.