We formulate Positivity Bounds for scattering amplitudes including exchange of massless particles. generalize the standard construction through dispersion relations to include presence a branch cut along real axis in complex plane Maldestam variable $s$. In general, validity these bounds require cancellation divergences forward limit amplitude, proportional $t^{-1}$ and $\log(t)$. show that thi...

Assuming unitarity, locality, causality, and Lorentz invariance of the, otherwise unknown, UV completion, we derive a new set constraints on the effective field theory coefficients for most general, ghost-free Generalized Proca Nuevo massive vector models. For model, include interactions that had not been previously considered in context positivity bounds find these additional terms lead to wid...