Proposed mixing between 2P and 1F wave charmonia

2026/04/30 by Peng-Yu Sun, Tian-Le Gao, Zi-Long Man +1
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1103/kpwy-d1ls

published as Phys. Rev. D 114, 034011 (2026) · 13 pages, 2 figures, 5 tables, accepted by Phys. Rev. D

arxiv created 2026/07/13 · arxiv updated 2026/08/07

Abstract

We investigate 2P-1F mixing in charmonium, focusing on the close-in-mass χ_c2(2P) and χ_c2(1F) states. The conventional tensor force yields negligible mixing, motivating the inclusion of coupled-channel effects. Our unquenched calculation reveals sizable mixing angles of 7.5^∘ and 15.4^∘. We predict the corresponding two-photon and two-gluon decay widths as key observables for experimental verification. Additionally, we discuss the production of these two 2P-1F mixed states of charmonium via γγ fusion. Current data are insufficient to determine the mixing, highlighting the need for precise future measurements to resolve this aspect of charmonium spectroscopy.

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