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arXiv · 2106.01390

Next-to-Next-to-Leading-Order QCD Prediction for the Photon-Pion Form Factor

Jing Gao·Tobias Huber·Yao Ji·Yu-Ming Wang
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Abstract

We accomplish the complete two-loop computation of the leading-twist contribution to the photon-pion transition form factor $γ\, γ^{\ast} \to π^0$ by applying the hard-collinear factorization theorem together with modern multi-loop techniques. The resulting predictions for the form factor indicate that the two-loop perturbative correction is numerically important. We also demonstrate that our results will play a key role in disentangling various models of the twist-two pion distribution amplitude thanks to the envisaged precision at Belle II.

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Jing Gao, Tobias Huber, Yao Ji, Yu-Ming Wang. 2022-02-17. Next-to-Next-to-Leading-Order QCD Prediction for the Photon-Pion Form Factor. https://doi.org/10.1103/physrevlett.128.062003

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