Volume 385 - 10th International Workshop on Charm Physics (CHARM2020) - Parallel programme
Triangle singularities in the production of X(3872)
L. He*, K. Ingles, E. Braaten and J. Jiang
Full text: pdf
Pre-published on: September 20, 2021
Published on:
Abstract
If the $X(3872)$ is a loosely bound charm-meson molecule, it can be produced by the creation of its constituents $D^{*0} \bar{D}^0$ or $D^{0} \bar{D}^{*0}$ at short distances followed by the formation of the bound state from the charm-meson pair.
It can also be produced by the creation of $D^* \bar{D}^*$ at short distances followed by the rescattering of the charm-meson pair into $X(3872) \gamma$ or $X(3872) \pi$ through a triangle loop.
The reaction rate for such a process has a triangle singularity, because the three charm mesons that form the triangle loop can all be on shell simultaneously.
Triangle singularities produce narrow peaks
in the production of $X(3872)$ accompanied by a photon in $e^+e^-$ annihilation, in the production of $X(3872)$ accompanied by a pion in $B$ meson decays, and in the prompt production of $X(3872)$ accompanied by a pion at hadron colliders.
The observation of those narrow peaks would prove definitively that $X(3872)$ is a loosely bound charm-meson molecule.
DOI: https://doi.org/10.22323/1.385.0027
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