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Description
I will present the first phenomenological application of multipositivity, focusing on chiral perturbation theory (χPT). After briefly reviewing the importance of χPT from both formal and phenomenological perspectives, I will introduce the basic ideas of the modern amplitude bootstrap and the essential ingredients required to derive multipositivity bounds. I will then show how these bounds imply a novel constraint on the Wilson coefficients of the chiral Lagrangian, revealing a connection between the anomalous and nonanomalous sectors in the planar limit.