https://doi.org/10.1051/epjconf/202430301002
Observation of e+e− → χc1 at BESIII
Institute of Nuclear Physics, University of Münster, Wilhelm-Klemm-Straße 9, 48149 Münster, Germany
* e-mail: a_drie04@uni-muenster.de
Published online: 25 September 2024
In electron-positron annihilations, the process of e+e− → χc1 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 χc1 mass, the direct production of χc1 has been established for the first time in experiments. This provides a new approach for the study of the internal nature of hadrons.
© The Authors, published by EDP Sciences, 2024
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