Observation of e+e− → χc1 at BESIII

Max Lellmann

doi:10.1051/epjconf/202429103002

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 291, 03002 (2024)
https://doi.org/10.1051/epjconf/202429103002

Observation of e⁺e⁻ → χ_c1 at BESIII

Max Lellmann^* on behalf of the BESIII collaboration

Institut für Kernphysik, Johannes Gutenberg-Universität Mainz

^* lellmann@uni-mainz.de

Published online: 16 February 2024

Abstract

Abstract. In electron-positron annihilation, the process of e⁺e⁻ → χ_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 χ_c1 mass, the direct production of χ_c1 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

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.