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Johan Bijnens in front of his whiteboard

Johan Bijnens

Professor, Deputy Head of Division

Johan Bijnens in front of his whiteboard

2-loop short-distance constraints for the g − 2 HLbL

Author

  • Johan Bijnens
  • Nils Hermansson-Truedsson
  • Laetitia Laub
  • Antonio Rodríguez-Sánchez

Summary, in English

The recent experimental measurement of the muon g−2 at Fermilab National Laboratory, at a 4.2σ tension with the Standard Model prediction, highlights the need for further improvements on the theoretical uncertainties associated to the hadronic sector. In the framework of the operator product expansion in the presence of a background feld, the short-distance behaviour of the hadronic light-by-light contribution was recently studied. The leading term in this expansion is given by the massless quark-loop, which is numerically dominant compared to non-perturbative corrections. Here, we present the perturbative QCD correction to the massless quark-loop and estimate its size numerically. In particular, we fnd that for scales above 1 GeV it is relatively small, in general roughly −10% the size of the massless quark-loop. The knowledge of these short-distance constraints will in the future allow to reduce the systematic uncertainties in the Standard Model prediction of the hadronic light-by-light contribution to the g−2.

Department/s

  • Department of Astronomy and Theoretical Physics - Has been reorganised
  • Theoretical Particle Physics - Has been reorganised

Publishing year

2022-11

Language

English

Pages

182-186

Publication/Series

Nuclear and Particle Physics Proceedings

Volume

318-323

Document type

Journal article

Publisher

Elsevier

Topic

  • Physical Sciences

Keywords

  • Higher Order Calculations
  • Muon Anomalous Magnetic Moment
  • Operator Product Expansion
  • Short-distance Constraints
  • Standard Model Tests

Status

Published

ISBN/ISSN/Other

  • ISSN: 2405-6014