Year: 2025
Type: conference-paper
Abstract: We calculate the next-to-next-to-leading order (NNLO) QCD radiative correction to the pion electromagnetic form factor with large momentum transfer for the first time. We explicitly verify the validity of the collinear factorization to two-loop order for this observable, and obtain the respective IR-finite two-loop hard-scattering kernel in the closed form. The NNLO QCD correction turns to be positive and significant. Incorporating this new ingredient of correction, we then make a comprehensive comparison between the finest theoretical predictions and numerous data for both space-like and time-like pion form factors. Our phenomenological analysis provides strong constraint on the second Gegenbauer moment of the pion light-cone distribution amplitude (LCDA) obtained from recent lattice QCD studies.
DOI: 10.22323/1.483.0073
Authors: Long-Bin Chen, Yu Jia, Wen Chen, Feng Feng
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4415516633
FWCI:
Cites:
Cited by:
Related to: