Seminars/Colloquia

# Seminar über Physik der Starken Wechselwirkung, "Production of $X(3872)$ in $e^+e^-$ annihilation "

## by Kevin Ingles (The Ohio State University)

Europe/Berlin
PH 3344 (Seminarraum Theorie) (TUM, Physik-Department)

### PH 3344 (Seminarraum Theorie)

#### TUM, Physik-Department

James-Franck-Str. 1, Garching
Description

Title: Production of $X(3872)$ in $e^+e^-$ annihilation

The $X(3872)$ can be produced in $e^+e^-$ annihilation by the creation of $D^{*0}\bar D^{*0}$ from a virtual photon, followed by the rescattering of the $P$-wave mesons into $X$ and a photon. The cross section for $e^+e^-\to X\gamma$ has a narrow peak 2.2 MeV above the $D^{*0}\bar D^{*0}$ threshold. This peak is the result of a triangle singularity. We calculate the normalized cross section near the $D^{*0}\bar D^{*0}$ threshold. The calculated peak is large enough to be measured by the BESIII collaboration. The observation of this peak would provide strong evidence for the identification of the $X$ as a hadronic molecule.

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