Wilson coefficients and natural zeros from the on-shell viewpoint
Luigi Delle Rose, Benedict von Harling, Alex Pomarol
Abstract
A bstract We show how to simplify the calculation of the finite contributions from heavy particles to EFT Wilson coefficients by using on-shell methods. We apply the technique to the one-loop calculation of g − 2 and Hγγ , showing how finite contributions can be obtained from the product of tree-level amplitudes. In certain cases, due to a parity symmetry of these amplitudes, the total contribution adds up to zero, as previously found in the literature. Our method allows to search for new natural zeros, as well as to obtain non-zero contributions in a straightforward way.
Topics & Concepts
PhysicsAmplitudeZero (linguistics)Parity (physics)Shell (structure)Mathematical physicsSymmetry (geometry)Loop (graph theory)Particle physicsTheoretical physicsQuantum electrodynamicsQuantum mechanicsGeometryCombinatoricsMathematicsComposite materialPhilosophyLinguisticsMaterials scienceParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research