Influence of σ^* and φ Mesons on Λ Hyperon ¹S₀ Superfluidity in Neutron Star Matter

Within the framework of the relativistic mean field theory, we investigate the ¹S₀ superfluidity (SF) of Λ hyperons in neutron star (NS) matter including σ^* and φ mesons. The energy gap of Λ hyperons is calculated with the Nijmegen one−boson-exchange potentials for a ΛΛ pair. The parameter set we use is in line with the recent experimental data ΔB_ΛΛ∼1.01±0.20^+0.18_−0.11 MeV. It is found that with σ^* and φ mesons the pairing energy gap Δ_F of Λ hyperons and the corresponding SF critical temperature T_CΛ are suppressed. In addition the NS mass range of Λ hyperon SF is enlarged obviously.