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- W4385018031 abstract "We perform a theoretical analysis of the semileptonic decays $eta^{(prime)} to pi^0 ell^+ ell^-$ and $eta' to eta ell^+ ell^-$, where $ell = e, mu$, via a charge-conjugation-conserving two-photon mechanism. The underlying form factors are modeled using vector-meson dominance, phenomenological input, and $mathrm{U}(3)$ flavor symmetry. We consider both a monopole and a dipole model, the latter tailored such that the expected high-energy behavior is ensured. Furthermore, we benchmark the effect of $S$-wave rescattering contributions to the decays. We infer significant effects of the form factors neglected in the literature so far, still finding branching ratios of the various decays well below the current experimental upper limits." @default.
- W4385018031 created "2023-07-22" @default.
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- W4385018031 date "2023-07-19" @default.
- W4385018031 modified "2023-09-27" @default.
- W4385018031 title "The semileptonic decays $eta^{(prime)} to pi^0 ell^+ ell^-$ and $eta' to eta ell^+ ell^-$ in the standard model" @default.
- W4385018031 doi "https://doi.org/10.48550/arxiv.2307.10357" @default.
- W4385018031 hasPublicationYear "2023" @default.
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