Measurement of branching fractions of Λc+ decays to Σ+K+K−, Σ+ϕ and Σ+K+π−(π0)

Based on 4.5 fb⁻¹ data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractions of Λ_c⁺→ Σ⁺ + hadrons relative to Λ_c⁺→ Σ⁺π⁺π⁻. Combining with the world average branching fraction of Λ_c⁺→ Σ⁺π⁺π⁻, their branching fractions are measured to be (0.377 ± 0.042 ± 0.020 ± 0.021)% for Λ_c⁺→ Σ⁺K⁺K⁻, (0.200 ± 0.023 ± 0.011 ± 0.011)% for Λ_c⁺→ Σ⁺K⁺π⁻, (0.414 ± 0.080 ± 0.030 ± 0.023)% for Λ_c⁺→ Σ⁺ϕ and (0.197 ± 0.036 ± 0.009 ± 0.011)% for Λ_c⁺ → Σ⁺K⁺K⁻(non-ϕ). In all the above results, the first uncertainties are statistical, the second are systematic and the third are from external input of the branching fraction of Λ_c⁺→ Σ⁺π⁺π⁻. Since no signal for Λ_c⁺→ Σ⁺K⁺π⁻π⁰ is observed, the upper limit of its branching fraction is determined to be 0.13% at the 90% confidence level.