Neutral hidden charm pentaquark states $P_c^0(4380)$ and $P_c^0(4450)$ in $\pi^-p \to J/\psi n$ reaction

TL;DR

This paper studies the production of neutral hidden charm pentaquark states in pion-proton collisions, predicting observable peaks in cross sections that can guide future experimental searches at J-PARC.

Contribution

It introduces an effective Lagrangian model to analyze neutral $P_c$ states in pion-induced reactions, highlighting their potential detection through specific energy peaks.

Findings

Clear peak structures at 4.38 GeV and 4.45 GeV in cross sections.

Reaction provides a promising platform to search for neutral $P_c$ states.

Predicted angular distributions can be tested in future experiments.

Abstract

We investigate the neutral hidden charm pentaquark states $P_c^0(4380)$ and $P_c^0(4450)$ in $\pi^-p \to J/\psi n$ reaction within an effective Lagrangian approach. The background contributions for the process mainly come from $t$-channel $\pi$ and $\rho$ meson exchanges. The contributions of $P_c^0(4380)$ and $P_c^0(4450)$ states give clear peak structures in the magnitude of 1 $\mu$b at center of mass energy 4.38 GeV and 4.45 GeV in the total cross sections. Hence, this reaction may provide a new good platform to search for neutral $P_c$ states. It is expected that our estimated total cross sections together with the angular distributions can be tested by future experiments at J-PARC.