Angular analysis of the decay Λb⁰ → Λ(1520) μ⁺μ⁻

This is the authors' abstract. We don't add key points for this paper.

The first angular analysis of Λb⁰ → Λ(1520) μ⁺μ⁻ decays is presented, using proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb⁻¹. The leptonic forward-backward asymmetry, AFB, 3/2^, and the $CP$-averaged angular observable, S1cc, are determined by fitting projections of the angular distributions in four intervals of the square of the dimuon invariant mass between 0.1 and 12.5 GeV²/c⁴. The results are in good agreement with predictions based on the Standard Model of particle physics.