Molecular Interpretation of the Supercharmonium State Z(4475)

TL;DR

This paper explores the molecular nature of the supercharmonium state Z(4475), proposing specific charm meson molecule models and predicting related states, with suggestions for experimental tests to verify these models.

Contribution

It introduces new molecular interpretations for Z(4475) involving excited charm mesons and predicts associated lower-mass states, advancing understanding of exotic charmonium-like states.

Findings

Two charm molecule assignments for Z(4475) are proposed.

Predicted lower-mass isosinglet charm molecule states.

Experimental ratios of decay modes are suggested as tests.

Abstract

Charm meson molecule (c\bar n)(n\bar c) assignments for the supercharmonium state Z(4475) are considered, both on general grounds and in the context of specific pion exchange models. Two possible charm molecule assignments for the JP = 1+, Z(4475) are considered here, involving respectively a radially and an orbitally excited charm meson. In each assignment, a lower-mass isosinglet charm molecule state is predicted. For both the Z(4475) and the Y(4260), measurement of the ratios of the branching fractions to D \bar D plus n pions is recommended as a test of the nature of these states.