Measurements of weak decay asymmetries of Λ⁺_c → pK⁰_s, Λπ⁺, Σ⁺ π⁰, and Σ⁰π⁺

Using e⁺e^- → Λ⁺_cΛ^-_c production from a 567 pb^-1 data sample collected by BESIII at 4.6 GeV, a full angular analysis is carried out simultaneously on the four decay modes of Λ⁺_c → pK⁰_S, Λπ⁺, Σ⁺π⁰, and Σ⁰π⁺. For the first time, the Λ⁺_c transverse polarization is studied in unpolarized e⁺e^- collisions, where a nonzero effect is observed with a statistical significance of 2.1σ. The decay asymmetry parameters of the Λ⁺_c weak hadronic decays into pK⁰_S, Λπ⁺, Σ⁺π⁰ and Σ⁰π⁺ are measured to be 0.18 ± 0.43(stat) ± 0.14(syst), -0.80 ± 0.11(stat) ± 0.02(syst), -0.57 ± 0.10(stat) ± 0.07(syst), and -0.73 ± 0.17(stat) ± 0.07(syst), respectively. In comparison with previous results, the measurements for the Λπ⁺ and Σ⁺π⁰ modes are consistent but with improved precision, while the parameters for the pK⁰_S and Σ⁰π⁺ modes are measured for the first time.