Abstract.
The extended Linear Sigma Model is an effective hadronic model based on the linear realization of chiral symmetry \( SU(N_{f})_{L} \times SU(N_{f})_{R}\) , with (pseudo)scalar and (axial-)vector mesons as degrees of freedom. In this paper, we study the low-energy limit of the extended Linear Sigma Model (eLSM) for \( N_{f}=2\) flavors by integrating out all fields except for the pions, the (pseudo-)Nambu-Goldstone bosons of chiral symmetry breaking. The resulting low-energy effective action is identical to Chiral Perturbation Theory (ChPT) after choosing a representative for the coset space generated by chiral symmetry breaking and expanding it in powers of (derivatives of) the pion fields. The tree-level values of the coupling constants of the effective low-energy action agree remarkably well with those of ChPT.
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Divotgey, F., Kovacs, P., Giacosa, F. et al. Low-energy limit of the extended Linear Sigma Model. Eur. Phys. J. A 54, 5 (2018). https://doi.org/10.1140/epja/i2018-12458-9
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DOI: https://doi.org/10.1140/epja/i2018-12458-9