Speaker
Description
In this presentation, we report on two recent results on peak-like structures observed in $\Lambda_c$ decays at Belle.
One is from $\Lambda_c \to pK^-\pi+$ decay where a peak near the $\Lambda \eta$ threshold is observed in the $pK^-$ mass spectrum. We studied the peak shape using a standard Breit-Wigner and Flatte distributions, and found the latter represents the shape by more than $7\sigma$. This result indicates that the observed peak is actually a threshold cusp.
In the second part, we report on the peak-like structure in $\Lambda \pi^{\pm}$ mass spectrum near the $\bar{K}N$ threshold in $\Lambda_c \to \Lambda \pi^+ \pi^+ \pi^-$ decay. We will show results of fits to Breit-Wigner distribution and an effective-range expansion model by Dalitz and Deloff [R. H. Dalitz and A. Deloff, Czech. J. Phys. B 32, 250 (1982)].
