1996/12/30 by M. V. Polyakov, Polyakov, M. V., G. Weidl +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9612486
13 pages, no figures
arxiv created 1996/12/30 · arxiv updated 2009/11/30
We consider in details the dual models for the Goldstone mesons (pions) scattering in the presence of the explicit chiral symmetry breaking caused by non-zero current quark mass. New method of incorporation of the quark masses into the dual model is suggested. In contrast to the previously considered in the literature methods, the dual amplitude obtained by this method is consistent with all low-energy theorems following from the Effective Chiral Lagrangian (EChL) to the O(p4) order and simultaneously it does not contain states with negative width. The resonance spectrum of the model and its implications for the fourth and sixth order EChL in large Nc limit are discussed. We argue that the possible relations between large Nc QCD and some underlying string theory can be revealed by studying interactions of hadrons at low-energies.