Search for the rare Λc⁺ → p μ⁺ μ⁻ decay

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

A search for the nonresonant Λc⁺ → p μ⁺ μ⁻ decay is performed using proton-proton collision data recorded at a centre-of-mass energy of 13 TeV by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb⁻¹. No evidence for the decay is found in the dimuon invariant-mass regions where the expected contributions of resonances is subdominant. The upper limit on the branching fraction of the Λc⁺ → p μ⁺ μ⁻ decay is determined to be 2.9~(3.2) × 10⁻⁸ at 90% (95%) confidence level. The branching fractions in the dimuon invariant-mass regions dominated by the η, ρ and ω resonances are also determined.