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The pion-photon transition form factor at two loops in QCD
by Jing Gao, Tobias Huber, Yao Ji, Yu-Ming Wang
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Submission summary
| Authors (as registered SciPost users): | Tobias Huber |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2110.14776v1 (pdf) |
| Date accepted: | 2022-02-28 |
| Date submitted: | 2021-10-29 16:20 |
| Submitted by: | Huber, Tobias |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 15th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology (RADCOR2021) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Phenomenological |
Abstract
We report on the fully analytic calculation of the leading-power contribution to the photon-pion transition form factor $\gamma \, \gamma^{\ast} \to \pi^0$ at two loops in QCD. The applied techniques are based on hard-collinear factorization, together with modern multi-loop methods. We focus both, on the technical details such as the treatment of evanescent operators, and the phenomenological implications. Our results indicate that the two-loop correction is numerically comparable to the one-loop effect in the same kinematic domain. We also demonstrate that our results will play a key role in disentangling various models for the twist-two pion distribution amplitude thanks to the envisaged precision at Belle II.
Published as SciPost Phys. Proc. 7, 022 (2022)
Reports on this Submission
Strengths
The article reports on the work presented at RADCOR/LoopFest 2021. It fulfills all the requirements for publication in SciPost Proceedings.
Weaknesses
None.
Report
The article reports on the work presented at RADCOR/LoopFest 2021. It fulfills all the requirements for publication in SciPost Proceedings and therefore we recommend its publication.
Requested changes
None.