# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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# Pc(4312), Pc(4380), and Pc(4457) as double triangle cusp

## Speakers

• Dr. Satoshi NAKAMURA

## Abstract

I discuss a novel scenario for the pentaquark-like signals in the LHCb data. I identify double triangle mechanisms with kinematical singularities. I demonstrate that the double triangle amplitudes reproduce the peak structures of $P_c(4312)$, $P_c(4380)$, and $P_c(4457)$, through an interference with other common mechanisms. Only the $P_c(4440)$ peak is due to a resonance with width and strength significantly smaller than the previous LHCb estimate. The reference is PRD 103, L111503 (2021).