Phys. Rev. D 63, 074019 (2001) [14 pages]U(3) chiral perturbation theory with infrared regularizationReceived 16 October 2000; published 13 March 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.074019
DOI:
10.1103/PhysRevD.63.074019
PACS:
12.39.Fe, 11.30.Rd, 14.40.-n
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