SciPost Submission Page
HLbL in muon g-2 at large loop momenta
by Johan Bijnens, Nils Hermansson-Truedsson and Antonio Rodríguez-Sánchez
Submission summary
| Authors (as registered SciPost users): | Antonio Rodriguez Sanchez |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202112_00039v1 (pdf) |
| Date accepted: | 2024-12-13 |
| Date submitted: | 2021-12-17 18:49 |
| Submitted by: | Rodriguez Sanchez, Antonio |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 16th International Workshop on Tau Lepton Physics (TAU2021) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Phenomenological |
Abstract
We study the HLbL contribution to g-2 in the kinematic region where the three loop momenta are large. We show how, even when the fourth photon is in the static limit, the massless quark loop gives the leading term of an operator product expansion. Power corrections are found to be small. Gluonic corrections are also included and the expansion is found to be well-behaved at relatively low-energies, which can be used to reduce uncertainties in the HLbL contribution to g-2.
Current status:
Editorial decision:
For Journal SciPost Physics Proceedings: Publish
(status: Editorial decision fixed and (if required) accepted by authors)
Reports on this Submission
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-30 (Invited Report)
Report
Data-driven techniques are used to improve upon the evaluation of hadronic light-by-light contribution to the anomalous magnetic moment of the muon. Although the momentum associated to the external photon is soft, operator product expansion can be applied for the hadronic light-by-light muon g-2 contribution when the three loop momenta are large, and the leading contribution is given by the massless quark loop. The leading power correction is found to be suppressed by two powers of the energy, from which one corresponds to the quark mass. In the chiral limit, the first power corrections appear suppressed by four powers of the energy. The gluonic corrections are found to be well-behaved at relatively low energies and can be used to
improve the precision of the data-driven evaluation of muon g-2.
Recommendation
Publish (surpasses expectations and criteria for this Journal; among top 10%)