Angular distribution of ${\Lambda }_c^{+}\to {\Lambda }_{1405/1520}^{\ast }(\to \Sigma \pi ){\ell }^{+}{\nu }_{\ell }$ and implications for form factors

Kaiwen Chen, Zhi-Peng Xing, Xudong Yu +1

We study the cascade semileptonic decay ${\Lambda }_c^{+}\to {\Lambda }_{1405/1520}^{\ast }(\to \Sigma \pi ){\ell }^{+}{\nu }_{\ell }$ using the helicity amplitude formalism, and derive the full four-body angular distribution. The…