For meson-baryon interactions at chiral order Q^3, the 24 counterterms obey 22 large-N_c sum rules, leaving only 2 independent parameters at leading order.
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We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with ${\it up}$, ${\it down}$ and ${\it strange}$ quark content were considered. For heavy-light and heavy-heavy meson systems, those with ${\it charm}$ quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.
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Constraints from a large-N_c analysis on meson-baryon interactions at chiral order Q^3
For meson-baryon interactions at chiral order Q^3, the 24 counterterms obey 22 large-N_c sum rules, leaving only 2 independent parameters at leading order.