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Large-N-c naturalness in coupled-channel meson-meson scattering

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Large-N-c naturalness in coupled-channel meson-meson scattering

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Ledwig, T.; Nieves Pamplona, Juan Miguel; Pich Zardoya, Antonio; Ruiz Arriola, Enrique; Ruiz de Elvira, Jacobo

Aquest document és un/a article, creat/da en: 2014

The analysis of hadronic interactions with effective field theory techniques is complicated by the appearance of a large number of low-energy constants, which are usually fitted to data. On the other hand, the large-Nc limit helps to impose natural short-distance constraints on these low-energy constants, providing a parameter reduction. A Bayesian interpretation of the expected 1/Nc accuracy allows for an easy and efficient implementation of these constraints, using an augmented χ2. We apply this approach to the analysis of meson-meson scattering, in conjunction with chiral perturbation theory to one loop and coupled-channel unitarity, and show that it helps to largely reduce the many existing ambiguities and simultaneously provide an acceptable description of the available phase shifts.

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