X(3872) \to D \bar D \gamma$ decays and the structure of X(3872)

• Main Authors: Colangelo, P, De Fazio, F, Nicotri, S
• Format: Journal Article
• Language: English
• Published: 08.01.2007
• Subjects: Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.hep-ph/0701052

Phys.Lett.B650:166-171,2007 It has been suggested that the radiative $X \to D \bar D \gamma$ decay modes are useful to shed light on the structure of the meson X(3872), since the ratio $ R={\Gamma(X \to D^+ D^- \gamma) \over \Gamma(X \to D^0 \bar D^0 \gamma)}$ is expected to be small ($R \ll 1$) if $X$ is a molecular $D^{*0} \bar D^0$ state. We compute $R$ in a $\bar c c$ $J^{PC}=1^{++}$ description of $X$ finding that it is tiny in a wide range of hadronic parameters governing the decay. A discrimination between the molecular and $\bar c c$ description can be obtained through the analysis of the photon spectrum.