J/psi gamma and psi(2S) gamma decay modes of the X(3872)

TL;DR

This paper investigates the decay modes of the X(3872) particle, proposing a mixed molecular and charmonium structure, and analyzes how this affects decay predictions and the particle's internal composition.

Contribution

It introduces a model combining molecular and c bar(c) components for X(3872) and constrains parameters to match decay width predictions, suggesting a dominant molecular nature.

Findings

Inclusion of molecular component improves decay description.

Radiative decay ratios suggest a subleading c bar(c) role.

Model constrains parameters to match potential model predictions.

Abstract

The X(3872) with quantum numbers J(PC) = 1(++) is considered as a composite state containing both molecular hadronic and a c bar(c) component. Based on this structure assumption we first constrain model parameters in order to reproduce the predictions for the radiative decay widths of X(3872) to J/psi gamma and X(3872) to psi(2S) gamma as obtained in c bar(c) potential models. Depending on these predictions we find that further inclusion of the molecular component can in principle lead to an improved description of the radiative X(3872) decays. We also show that strong decay modes of the X(3872) and in particular the ratio of radiative (J/psi gamma) to strong (J/psi pi(+) pi(-)) decays hint towards a subleading role of the c bar(c) component in the X(3872).