# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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# Triangle singularities in production of X(3872)

• Liping HE

## Abstract

If the X(3872) is a weakly bound charm-meson molecule, it can be produced by the creation of $D^ \bar D^$ at short distances followed by the rescattering of the charm mesons into X(3872) and a photon or a pion through a triangle loop. A triangle singularity produces narrow peak in the reaction rate in production of X(3872). The observation of this peak would provide strong evidence in support of the identification of the X(3872) as a charm-meson molecule.