# Interpretation of the LHCb Pc(4312) Signal

## TL;DR

This paper analyzes the Pc(4312) signal observed by LHCb using S-matrix principles, exploring reaction amplitudes to understand its microscopic origin and the role of the Sigma_c+ D0bar channel.

## Contribution

It introduces a model-independent amplitude analysis based on S-matrix principles to interpret the Pc(4312) peak in the J/psi p spectrum.

## Key findings

- Evidence for the attractive effect of the Sigma_c+ D0bar channel
- The attraction is insufficient to form a bound state
- Analysis supports a resonance interpretation of the Pc(4312)

## Abstract

We study the nature of the new signal reported by LHCb in the J/psi p spectrum. Based on the S-matrix principles, we perform a minimum-bias analysis of the underlying reaction amplitude, focusing on the analytic properties that can be related to the microscopic origin of the Pc(4312) peak. By exploring several amplitude parametrizations, we find evidence for the attractive effect of the Sigma_c+ D0bar channel, which is not strong enough, however, to form a bound state.