Semileptonic decays of Λ⁺c in light-front quark model with nonvalence contributions

We investigate the exclusive semilpetonic decays of Λ⁺c→ (Λ/n) ⁺ ν_~(=e,μ) within the standard model by using the light-front quark model (LFQM). The form factor behaviors are obtained from the effective treatment of nonvalence contributions in addition to the valence ones in the Drell-Yan-West frame due to the Bethe-Salpeter formalism. Based on these form factors, we find that the decay branching ratios of Λ⁺c→ (Λe⁺ νₑ,\,Λμ⁺ νₑ ,\, n e⁺ νₑ,\, n μ⁺ νₑ) are about $ (3.39,\,3.21,\,0.36,\,0.35)%$ with the non-valence contributions, which are consistent with the recent experimental measurements at BESIII. Furthermore, we use the experimental data to fit the $β$ parameters in the baryonic distribution amplitudes under the LFQM, resulting in (β_Λc,β_Λ, βₙ)= (0.58±0.08, 0.52±0.08,0.44±0.04).