Abstract
The chiral perturbation theory is developed at the quark level within the Extended Nambu-Jona-Lasinio model which we used for the low-energy approximation of QCD in the leading order of the large N expansion. In terms of constituent-quark-loop diagrams we analyse all of the main low-energy effects caused by the first order corrections in the current quark mass expansions. For the correct description of theη →3π decays we confirm the important role of the final-state-interaction quoted by Gasser and Leutwyler.
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We are very indebted to J. Gasser, G. Ecker and M. Sainio for helpfull discussions and A. Nogová for reading the manuscript. One of us, M.N., thanks A. Di Giacomo for his hospitality during the stay at the Department of Physics of the University of Pisa.
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Ivanov, A.N., Nagy, M. & Troitskaya, N.I. Chiral perturbation theory in the Extended Nambu-Jona-Lasinio model. Czech J Phys 42, 861–890 (1992). https://doi.org/10.1007/BF01605164
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DOI: https://doi.org/10.1007/BF01605164