Subleading power corrections to the pion-photon transition form factor in QCD
- Autor(en)
- Yu-Ming Wang, Yue-Long Shen
- Abstrakt
We reconsider QCD factorization for the leading power contribution to the γ
*γ → π
0 form factor F0(Q
2) at one loop using the evanescent operator approach, and demonstrate the equivalence of the resulting factorization formulae derived with distinct prescriptions of γ
5 in dimensional regularization. Applying the light-cone QCD sum rules (LCSRs) with photon distribution amplitudes (DAs) we further compute the subleading power contribution to the pion-photon form factor induced by the “hadronic” component of the real photon at the next-to-leading-order in O(α
s) , with both naive dimensional regularization and ’t Hooft-Veltman schemes of γ
5. Confronting our theoretical predictions of F
0 (Q
2) with the experimental measurements from the BaBar and the Belle Collaborations implies that a reasonable agreement can be achieved without introducing an “exotic” end-point behaviour for the twist-2 pion DA.
- Organisation(en)
- Teilchenphysik
- Externe Organisation(en)
- Nankai University, Ocean University of China
- Journal
- Journal of High Energy Physics
- Band
- 2017
- Anzahl der Seiten
- 38
- ISSN
- 1029-8479
- DOI
- https://doi.org/10.1007/JHEP12(2017)037
- Publikationsdatum
- 12-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103012 Hochenergiephysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Nuclear and High Energy Physics
- Link zum Portal
- https://ucris.univie.ac.at/portal/de/publications/subleading-power-corrections-to-the-pionphoton-transition-form-factor-in-qcd(c94fb478-936b-4111-b714-bdd3d64c583f).html