Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
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 at the one-loop level up to and including next-to-next-to-leading order (NNLO) in large- 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 as well as , with , .