Gauge theory bootstrap
Résumé
We propose the gauge theory bootstrap, a method to compute the pion S matrix that describes the lowenergy physics of the strong interaction and other similar gauge theories. The phase shifts of the S0, P1, and S2 waves obtained are in good agreement with experimental results. The only numerical inputs are the quark mass $m$$q$, the QCD scale ΛQCD, the pion mass $m$π, and the pion decay constant $f$π without any other experimental data. We make use of the form-factor bootstrap recently proposed by Karateev, Kuhn, and Penedones together with a finite energy version of the Shifman-Veinshtein-Zakharov sum rules.
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