TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.7.022
TI  - The pion-photon transition form factor at two loops in QCD
PY  - 2022/06/21
UR  - https://www.scipost.org/SciPostPhysProc.7.022
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 7
SP  - 022
A1  - Gao, Jing
AU  - Huber, Tobias
AU  - Ji, Yao
AU  - Wang, Yu-Ming
AB  - 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.
ER  -

@Article{10.21468/SciPostPhysProc.7.022,
	title={{The pion-photon transition form factor at two loops in QCD}},
	author={Jing Gao and Tobias Huber and Yao Ji and Yu-Ming Wang},
	journal={SciPost Phys. Proc.},
	pages={022},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.7.022},
	url={https://scipost.org/10.21468/SciPostPhysProc.7.022},
}