η-η′ mixing in large- Nc chiral perturbation theory

P. Bickert, P. Masjuan, S. Scherer

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10 Citations (Scopus)

Abstract

© 2017 American Physical Society. We present a calculation of the η-η′ mixing in the framework of large-Nc chiral perturbation theory. A general expression for the η-η′ mixing at next-to-next-to-leading order (NNLO) is derived, including higher-derivative terms up to fourth order in the 4-momentum, kinetic terms, and mass terms. In addition, the axial-vector decay constants of the η-η′ system are determined at NNLO. The numerical analysis of the results is performed successively at leading order, next-to-leading order, and NNLO. We investigate the influence of one-loop corrections, Okubo-Zweig-Iizuka rule-violating parameters, and O(Ncp6) contact terms.
Original languageEnglish
Article number054023
JournalPhysical Review D
Volume95
Issue number5
DOIs
Publication statusPublished - 1 Mar 2017

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