Disperon QED

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Abstract
We present disperon QED, a method to deal with data input in loop processes in Monte Carlo codes. It relies on dispersion relations, automated tools such as OpenLoops, effective field theory methods and a threshold subtraction. We motivate this method and apply it to the process ee\to\pi\pi e e → π π in McMule to deal with hadronic vacuum polarisation insertions in two-loop contributions as well as the vector form factor of the pion within the form-factor scalar QED approximation. The generality of this method for more complicated processes is emphasised.
Funding Information
  • Ministero dell’Istruzione, dell’Università e della Ricerca (2022BCXSW9)
  • Ministero dell’Istruzione, dell’Università e della Ricerca (CUP: D53C24005480001)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (207386)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (TMSGI2-211209)

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