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IMPROVED REGULARITY OF SECOND DERIVATIVES FOR SUBHARMONIC FUNCTIONS
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Positive moments for scattering amplitudes
Riccardo Rattazzi, Francesco Riva, Marc Riembau Saperas, Brando Bellazzini
We find the complete set of conditions satisfied by the forward 2 -> 2 scattering amplitude in unitary and causal theories. These are based on an infinite set of energy dependent quantities (the arcs) which are dispersively expressed as moments of a positi ...
American Physical Society2021