Measurement of the Decay Asymmetry Parameters in $\Lambda_c^+ \to \Lambda\pi^+$ and $\Lambda_c^+ \to \Sigma^+\pi^0 $

TL;DR

This paper reports measurements of decay asymmetry parameters in specific Lambda_c+ decay modes, providing insights into parity violation and testing theoretical models of charmed baryon decay.

Contribution

First measurements of decay asymmetry parameters for Lambda_c+ to Lambda pi+ and Sigma+ pi0 decays, enabling tests of decay models.

Findings

Measured asymmetry parameters: -0.94 for Lambda pi+ and -0.45 for Sigma pi0 decays.

Extracted parity-violating and parity-conserving amplitudes.

Results used to evaluate theoretical models of nonleptonic charmed baryon decay.

Abstract

We have measured the weak decay asymmetry parameters ($\aLC $) for two \LC\ decay modes. Our measurements are $\aLC = -0.94^{+0.21+0.12}_{-0.06-0.06} $ for the decay mode $\Lambda_c^+ \to \Lambda\pi^+ $ and $\aLC = -0.45\pm 0.31 \pm 0.06$ for the decay mode $\Lambda_c \to \Sigma^+\pi^0 $. 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.