Radiative decays of the h_c meson from lattice QCD

2026/07/28 by Mischa Batelaan, Jozef J. Dudek, Robert G. Edwards
#hep-lat

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Abstract

We explore, for the first time in lattice QCD, the radiative decays to γη and γη' of the J^PC=1^+- charmonium state, h_c. This work expands upon a previous calculation of J/ψ decays to the same final states, incorporating novel technology to access the h_c where it is an excited state and to separate the independent electric dipole and longitudinal form--factors. Results for the radiative decay rates, computed on three-flavor lattices with m_π∼ 391 MeV show a suppression relative to experiment that is similar to that observed in the prior calculation of J/ψ→ γη^(′). The timelike Q² dependence of both form--factors together influence the Dalitz decays, h_c → ℓ⁺ ℓ^- η^(′), which are as yet unmeasured experimentally.

Related

• Radiative decays of charmonia on the lattice
• Lattice QCD determination of the radiative decay rates h_c→ η_c γ and h_b→ η_b γ
• η and η' meson production in J/ψ radiative decays from lattice QCD
• η and η' production in J/ψ radiative decays from quantum chromodynamics
• Radiative Transitions for the Ground and Excited Charmonia States