A subtraction scheme for massive QED
T. Engel, A. Signer, Y. Ulrich
Abstract
A bstract We present an extension of the FKS subtraction scheme beyond next-to-leading order to deal with soft singularities in fully differential calculations within QED with mas- sive fermions. After a detailed discussion of the next-to-next-to-leading order case, we show how to extend the scheme to even higher orders in perturbation theory. As an application we discuss the computation of the next-to-next-to-leading order QED corrections to the muon decay and present differential results with full electron mass dependence.
Topics & Concepts
PhysicsSubtractionComputationGravitational singularityPerturbation theory (quantum mechanics)Differential (mechanical device)Scheme (mathematics)MuonQuantum electrodynamicsOrder (exchange)Particle physicsPerturbation (astronomy)Extension (predicate logic)ElectronMathematical physicsTheoretical physicsDifferential equationBackground subtractionQuantum mechanicsFirst orderFactorizationPropagatorParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsComputational Physics and Python Applications