A Tentative Description of Z_c,b States in Terms of Metastable Feshbach Resonances

TL;DR

This paper explores the nature of Z_{c,b} states as Feshbach resonances resulting from interactions between hadrocharmonium levels and open-charm/beauty thresholds, offering insights into their properties and widths.

Contribution

It introduces a novel interpretation of Z_{c,b} states as metastable Feshbach resonances, connecting hadrocharmonium and threshold phenomena.

Findings

Neutrality of X(3872) explained in this framework

Pattern of total widths of Z_{c,b} states qualitatively reproduced

Preliminary model suggests Feshbach resonance nature of these states

Abstract

We attempt a description of the recently discovered Z_{c,b} states in terms of Feshbach resonances arising from the interaction between the `closed' subspace of hadrocharmonium levels and the `open' one of open-charm/beauty thresholds. We show how the neutrality of the X(3872) might be understood in this scheme and provide a preliminary explanation of the pattern of the measured total widths of X,Z_{c,b}.