1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edificio Marzolo)
1/1-2 - Aula "C. Voci"
Dipartimento di Fisica e Astronomia - Edificio Marzolo
We study 2-to-2 scattering amplitudes of massless spin one particles in four spacetime dimensions, like real world photons. We use full nonlinear unitarity to construct numerical bounds on the Wilson coefficients, which describe these amplitudes at low energies. Some of the bounds can be recovered analytically by using the optical theorem, others cannot. Finally, some Wilson coefficients cannot be bounded, and we discuss why.