Categoria: General From data to the analytic S-matrix - Dr. Andrea Guerrieri (City St. George’s, University of London

From data to the analytic S-matrix - Dr. Andrea Guerrieri (City St. George’s, University of London


Aprile 23, 2025

seminario di fisica teorica

In this talk I will discuss our recent attempt https://arxiv.org/pdf/2410.23333 of understanding the QCD spectrum using the available experimental data. To do so, we developed a fit strategy that combines the S-matrix Bootstrap with non-convex optimization methods, and applied our algorithm to the case of pipi scattering. The fitted amplitude correctly predicts the low energy ChiPT behavior, the experimental total cross sections at higher energy, and the physical spectrum up to 1.4 GeV. Surprisingly, the Bootstrap predicts an additional tetraquark state, not yet observed, and that is being investigated in the decay of the B+ -> pi+ p+ pi- at <a href="http://LHCb.
" target="_blank" title="LHCb.
">LHCb.

aula 501

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