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η(′)→π+π−γ(*)in large-Ncchiral perturbation theory
Physical Review D  (IF5.296),  Pub Date : 2021-10-21, DOI: 10.1103/physrevd.104.074021
P. Bickert, S. Scherer

We present a calculation of the decays η()π+πγ(*) at the one-loop level up to and including next-to-next-to-leading order (NNLO) in large-Nc chiral perturbation theory. The numerical evaluation of the results is performed successively at LO, NLO, and NNLO, fitting the relevant low-energy constants to the available experimental data. We discuss the widths and decay spectra of η()π+πγ as well as η()π+πl+l, with l=e, μ.