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arxiv: 1409.4311 · v1 · pith:MG7TPV6Znew · submitted 2014-09-15 · ✦ hep-ph

Transition form factors γ^*γtoη and γ^*γtoη' in QCD

S.S. Agaev , V.M. Braun , N. Offen , F.A. Porkert , A. Sch\"afer This is my paper
classification ✦ hep-ph
keywords gammaanalysisfactorsformtransitionaccountamplitudesanomaly
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We update the theoretical framework for the QCD calculation of transition form factors $\gamma^*\gamma\to\eta$ and $\gamma^*\gamma\to\eta'$ at large photon virtualities including full next-to-leading order analysis of perturbative corrections, the charm quark contribution, and taking into account SU(3)-flavor breaking effects and the axial anomaly contributions to the power-suppressed twist-four distribution amplitudes. The numerical analysis of the existing experimental data is performed with these improvements.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Radiative charmonium decays in a contact-interaction model with dynamical quark anomalous magnetic moment

    hep-ph 2026-04 unverdicted novelty 6.0

    Contact-interaction model with dynamical quark anomalous magnetic moment reproduces lattice QCD results for eta_c to gamma gamma and J/psi to gamma eta_c decays, consistent with 2026 data but not the 2024 measurement.

  2. Improved Standard-Model predictions for $\eta^{(\prime)}\to \ell^+ \ell^-$

    hep-ph 2025-12 accept novelty 5.0

    Updated SM predictions yield Br(η→e⁺e⁻)=5.37(4)(2)[4]×10⁻⁹, Br(η→μ⁺μ⁻)=4.54(4)(2)[4]×10⁻⁶, Br(η'→e⁺e⁻)=1.80(2)(3)[3]×10⁻¹⁰, and Br(η'→μ⁺μ⁻)=1.22(2)(2)[3]×10⁻⁷, with a mild 1.6σ tension in the η→μ⁺μ⁻ channel.