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arXiv · hep-ph/0105132

U(3) chiral perturbation theory with infrared regularization

B. Borasoy·S. Wetzel
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Abstract

We include the eta-prime in chiral perturbation theory without employing 1/N_c counting rules. The method is illustrated by calculating the masses and decay constants of the Goldstone boson octet (pions, kaons, eta) and the singlet eta-prime up to one-loop order. The effective Lagrangian describing the interactions of the eta-prime 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.

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B. Borasoy, S. Wetzel. 2001-05-15. U(3) chiral perturbation theory with infrared regularization. https://doi.org/10.1103/physrevd.63.074019

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