On the Interpretation of Nonresonant Phenomena at Colliders

With null results in resonance searches at the LHC, physics potential focus is now shifting towards interpretation of nonresonant phenomena. An example such shift increased popularity EFT programme. We can embark on programme owing to good integrated luminosity and an excellent understanding detectors, which will allow these become more intense as LHC continues. In this paper, we provide a framework perform terms diverse set scenarios, including (1) generic heavy new described low energies derivative expansion, approach; (2) very light particles with couplings, axions or other pseudo-Goldstone bosons; (3) effect quasicontinuum resonances, come from number strongly coupled theories, extradimensional models, clockwork set-ups, their deconstructed cousins. These scenarios are not equivalent despite all nonresonance, although matching among some them possible, it paper.