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

We accomplish the complete two-loop computation of the leading-twist contribution to the photon-pion transition form factor γγ^{*}→π^{0} by applying the hard-collinear factorization theorem together with modern multiloop 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.

Citation

Jing Gao, Tobias Huber, Yao Ji, Yu-Ming Wang. Next-to-Next-to-Leading-Order QCD Prediction for the Photon-Pion Form Factor. Physical review letters. 2022 Feb 11;128(6):062003

PMID: 35213190

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