Speaker
Max Lellmann
(Johannes Gutenberg University Mainz)
Description
In electron-positron annihilation, the process of $e^+e^- \to \chi_{c1}$ can occur via the production of two virtual photons or through neutral current, therefore being suppressed with respect to the normal annihilation process via one virtual photon. Using a dedicated scan sample around the $\chi_{c1}$ mass, the direct production of $\chi_{c1}$ has been established for the first time in experiments. This provides a new approach for the study of the internal nature of hadrons.
| Collaboration | BESIII |
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Primary author
Fabrizio Bianchi
(INFN and University of Torino)
