Measurements of Weak Decay Asymmetries of ${\mathrm{\Lambda }}_c^{+}\to p{K}_S^0$, $\mathrm{\Lambda }{\pi }^{+}$, ${\mathrm{\Sigma }}^{+}{\pi }^0$, and ${\mathrm{\Sigma }}^0{\pi }^{+}$

Using $e^{+}{e}^{-}\to {\mathrm{\Lambda }}_c^{+}{\bar{\mathrm{\Lambda }}}_c^{-}$ 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 ${\mathrm{\Lambda }}_c^{+}\to p{K}_S^0$, $\Lambda \pi^+$,$\Sigma^+\pi^0$,and$\Sigma^0\pi^+$\mathrm{.}Forthefirsttime,the$\Lambda_c^+$transversepolarizationisstudiedinunpolarized$e^+e^-$ collisions, where a non-zero effect is observed with a statistical significance of 2.1$\sigma$. The decay asymmetry parameters of the ${\mathrm{\Lambda }}_c^{+}$ weak hadronic decays into $p{K}_S^0$, $\mathrm{\Lambda }{\pi }^{+}$, ${\mathrm{\Sigma }}^{+}{\pi }^0$ and ${\mathrm{\Sigma }}^0{\pi }^{+}$ are measured to be $0.18\pm 0.43(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.14(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$, $-0.80\pm 0.11(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.02(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$, $-0.57\pm 0.10(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.07(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$, and $-0.73\pm 0.17(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.07(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$, respectively. In comparison with previous results, the measurements for the $\mathrm{\Lambda }{\pi }^{+}$ and ${\mathrm{\Sigma }}^{+}{\pi }^0$ modes are consistent but with improved precision, while the parameters for the $p{K}_S^0$ and ${\mathrm{\Sigma }}^0{\pi }^{+}$ modes are measured for the first time.