Gillioz, MarcMeineri, MarcoPenedones, Joao2020-12-252020-12-252020-12-252020-11-2510.1007/JHEP11(2020)139https://infoscience.epfl.ch/handle/20.500.14299/174322WOS:000595818700010We define form factors and scattering amplitudes in Conformal Field Theory as the coefficient of the singularity of the Fourier transform of time-ordered correlation functions, as p(2) -> 0. In particular, we study a form factor F(s, t, u) obtained from a four-point function of identical scalar primary operators. We show that F is crossing symmetric, analytic and it has a partial wave expansion. We illustrate our findings in the 3d Ising model, perturbative fixed points and holographic CFTs.Physics, Particles & FieldsPhysicsconformal field theoryscattering amplitudesads-cft correspondencetext::journal::journal article::research article