Amplitude analysis of the charmed baryon decay Lambda_c+ to p K_S^0 pi0
Using $e^+e^-$ annihilation data corresponding to an integrated luminosity of 4.5 fb$^{-1}$ collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, the first amplitude analysis of the charmed baryon decay $Λ_c^+ \to p K_S^0 π^0$ is performed. The processes $Λ_c^+ \to p \bar{K}^{*}(892)^0$, $Λ_c^+ \to Δ(1600)^+ K_S^0$, and $Λ_c^+ \to N(1710)^+ K_S^0$ are identified with statistical significances of $12.8σ$, $14.5σ$, and $6.2σ$, respectively. The mass and width of $Δ(1600)^+$ are measured to be $(1520.4 \pm 8.8 \pm 37.7)~\text{MeV}$ and $(199.4 \pm 26.4 \pm 39.9)~\text{MeV}$, respectively. The mass and width of $N(1710)^+$ are measured to be $(1719.7 \pm 9.4 \pm 9.1)~\text{MeV}$ and $(72.0 \pm 18.0 \pm 15.0)~\text{MeV}$, respectively. The branching fractions of these processes are determined to be $\mathcal{B}[Λ_c^+ \rightarrow Δ(1600)^+ (\rightarrow p π^0) K_S^0] = (8.10 \pm 0.80 \pm 5.57) \times 10^{-3}$, $\mathcal{B}[Λ_c^+ \rightarrow N(1710)^+ (\rightarrow p π^0) K_S^0] = (1.58 \pm 0.48 \pm 0.77) \times 10^{-3}$, and $\mathcal{B}[Λ_c^+ \rightarrow p \bar{K}^{*}(892)^0 (\rightarrow K_S^0 π^0)] = (2.63 \pm 0.47 \pm 0.29) \times 10^{-3}$, where the first uncertainties are statistical and the second systematic.