Measurement of the decay asymmetry parameters in Λc+ → Λπ+ and Λc+ → Σ+π0

We have measured the weak decay asymmetry parameters ( α_Λc) for two Λ_c⁺ decay modes. Our measurements are α_Λc = -0.94 _-0.06-0.06^+0.21+0.12 for the decay mode Λ_c⁺ → Λπ⁺ and α_Λc = -0.45 ±0.31 ±0.06 for the decay mode Λ_c → Σ⁺π⁰. By combining these measurements with the previously measured decay rates, we have extracted the parity-violating and parity-conserving amplitudes. These amplitudes are used to test models of nonleptonic charmed baryon decay.