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The Phases of the Scalar S-Matrix Island
Joan Elias Miro, Andrea Guerrieri, Mehmet Asim Gumus
The two-to-two four-dimensional scattering amplitude of identical scalars obeys rigorous two-sided non-perturbative bounds derived via the modern numerical S-matrix bootstrap. Thes…
Cross-Section Bootstrap: Unveiling the Froissart Amplitude
Miguel Correia, Alessandro Georgoudis, Andrea L. Guerrieri
We derive a universal bound on the integrated total scattering cross-section at \emph{finite} energies, expressed in terms of a single low-energy coefficient constrained by the non…
From data to the analytic S-matrix: A Bootstrap fit of the pion scattering amplitude
Andrea Guerrieri, Kelian Häring, Ning Su
We propose a novel strategy to fit experimental data using a UV complete amplitude ansatz satisfying the constraints of Analyticity, Crossing, and Unitarity. We focus on scatt…