Four-point functions in momentum space: conformal ward identities in the scalar/tensor case Claudio Corianò, Matteo Maria Maglio and Dimosthenis Theofilopoulos Eur. Phys. J. C, 80 6 (2020) 540 Published online: 16 June 2020 DOI: 10.1140/epjc/s10052-020-8089-1