Jun 22 – 27, 2023
Auditorium Maximum
Europe/Warsaw timezone

Observation of e+e- to chi_c1 at BESIII

Jun 22, 2023, 6:15 PM
Medium lecture hall (A) (Auditorium Maximum)

Medium lecture hall (A)

Auditorium Maximum


Max Lellmann (Johannes Gutenberg University Mainz)


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

Primary author

Fabrizio Bianchi (INFN and University of Torino)

Presentation materials