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

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

2007-01-08

arxiv.org/abs/hep-ph/0701052v2

Phys.Lett.B650:166-171,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 12 pages, 5 figures, version accepted for publication in PLB

Scientific paper

10.1016/j.physletb.2007.05.012

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.

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