Speaker
Yu-Ming Wang
(Nankai University)
Description
We accomplish the complete two-loop computation of the leading-twist contribution to the photon-pion transition form factor $\gamma \gamma^∗ \to \pi $ 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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Primary author
Yu-Ming Wang
(Nankai University)
