ar X iv : h ep - p h / 01 05 13 2 v 1 1 5 M ay 2 00 1 U ( 3 ) chiral perturbation theory with infrared regularization 1
نویسنده
چکیده
We include the η′ in chiral perturbation theory without employing 1/Nc counting rules. The method is illustrated by calculating the masses and decay constants of the Goldstone boson octet (π,K, η) and the singlet η′ up to one-loop order. The effective Lagrangian describing the interactions of the η′ with the Goldstone boson octet is presented up to fourth chiral order and the loop integrals are evaluated using infrared regularization, which preserves Lorentz and chiral symmetry. Work supported in part by the DFG email: [email protected] email: [email protected]
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