Three-loop helicity amplitudes for diphoton production in gluon fusion
Piotr Bargieła, Fabrizio Caola, Andreas von Manteuffel, Lorenzo Tancredi
Abstract
A bstract We present a calculation of the helicity amplitudes for the process gg → γγ in three-loop massless QCD. We employ a recently proposed method to calculate scattering amplitudes in the ’t Hooft-Veltman scheme that reduces the amount of spurious non-physical information needed at intermediate stages of the computation. Our analytic results for the three-loop helicity amplitudes are remarkably compact, and can be efficiently evaluated numerically. This calculation provides the last missing building block for the computation of NNLO QCD corrections to diphoton production in gluon fusion.
Topics & Concepts
HelicityPhysicsParticle physicsGluonQuantum chromodynamicsSpurious relationshipMassless particleAmplitudeComputationLoop (graph theory)Quantum electrodynamicsScattering amplitudeQuantum mechanicsMathematicsAlgorithmStatisticsCombinatoricsParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research