TL;DR
McMule is a Fortran framework for precise higher-order QED calculations involving leptons, incorporating finite lepton masses and advanced regularisation techniques, enabling accurate predictions for various scattering experiments.
Contribution
The paper introduces McMule, a new computational framework for NNLO QED calculations that maintains finite lepton masses and implements FKS$^ ext{ extellipsis}$ subtraction in Fortran 95.
Findings
New phenomenological results for muon-electron scattering
NNLO corrections for lepton-proton scattering
Applicable to multiple ongoing experiments
Abstract
McMule is a framework for fully differential higher-order QED calculations of scattering and decay processes involving leptons. It keeps finite lepton masses, which regularises collinear singularities. Soft singularities are treated with dimensional regularisation and using FKS subtraction. We describe the implementation of the framework in Fortran 95, list the processes that are currently implemented, and give instructions on how to run the code. In addition, we present new phenomenological results for muon-electron scattering and lepton-proton scattering, including the dominant NNLO corrections. While the applications presented focus on MUonE, MUSE, and P2, the code can be used for a large number of planned and running experiments.
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