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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

The two-loop perturbative correction to the (g − 2) μ HLbL at short distances

Author

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

Summary, in English

The short-distance behaviour of the hadronic light-by-light (HLbL) contribution to (g − 2)μ has recently been studied by means of an operator product expansion in a background electromagnetic field. The leading term in this expansion has been shown to be given by the massless quark loop, and the non-perturbative corrections are numerically very suppressed. Here, we calculate the perturbative QCD correction to the massless quark loop. The correction is found to be fairly small compared to the quark loop as far as we study energy scales where the perturbative running for the QCD coupling is well-defined, i.e. for scales μ ≳ 1 GeV. This should allow to reduce the large systematic uncertainty associated to high-multiplicity hadronic states.

Department/s

  • Theoretical Particle Physics

Publishing year

2021-04-01

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2021

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Perturbative QCD
  • Precision QED

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479