Constraints on new physics from decays of polarized Λ b 0 baryons at the FCC-ee

The Z 0 bosons produced in electron-positron collisions at the potential Future Circular Collider (FCC-ee) provide unique opportunities for flavor physics. The nonzero polarization of Λ b 0 baryons produced in Z 0 decays enables access to a much larger set of observables than at the LHC, where the Λ b 0 baryons are produced unpolarized. This paper presents a toy angular analysis of Λ b 0 → Λ ( → p π − ) μ + μ − decays using simulation samples of collisions at the FCC-ee reconstructed using the IDEA detector concept and assuming a dataset of 6 × 10 12 Z 0 bosons. While the statistical sensitivity achieved for individual angular observables is not expected to significantly exceed that from the LHCb Upgrade II experiment, the addition of the polarized observables leads to a significant improvement of the knowledge on the Wilson coefficients C 9 ( ′ ) and C 10 ( ′ ) .