Guerrieri, Andrea L.Penedones, JoaoVieira, Pedro2021-07-032021-07-032021-07-032021-06-1410.1007/JHEP06(2021)088https://infoscience.epfl.ch/handle/20.500.14299/179679WOS:000663759900001We use the numerical S-matrix bootstrap method to obtain bounds on the two leading Wilson coefficients (or low energy constants) of the chiral lagrangian controlling the low-energy dynamics of massless pions. This provides a proof of concept that the numerical S-matrix bootstrap can be used to derive non-perturbative bounds on massless EFTs in more than two spacetime dimensions.Physics, Particles & FieldsPhysicschiral lagrangianseffective field theoriesscattering amplitudeschiral perturbation-theorypi-pi-scatteringbehaviortext::journal::journal article::research article