Disperon QED
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 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>e</mml:mi> <mml:mi>e</mml:mi> <mml:mo>→</mml:mo> <mml:mi>π</mml:mi> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> 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.
Authors
- Sophie Kollatzsch (ORCID: https://orcid.org/0000-0002-8560-1619)
- Adrian Signer (ORCID: https://orcid.org/0000-0001-8488-7400)
- Yizhou Fang (ORCID: https://orcid.org/0009-0003-3568-9661)
- Max Zoller (ORCID: https://orcid.org/0000-0001-9233-7951)
- Yannick Ulrich (ORCID: https://orcid.org/0000-0002-9947-3064)
- Marco Rocco (ORCID: https://orcid.org/0000-0002-2561-1209)
Institutions
- University of Liverpool (GB)
- University of Zurich (CH)
- Paul Scherrer Institute (CH)
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- University of Turin (IT)
Publication Details
- Journal
- SciPost Physics
- Published
- 2026-04-17
- DOI
- https://doi.org/10.21468/scipostphys.20.4.116
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung