Next-to-Next-to-Leading-Order QCD Corrections to Pion Electromagnetic Form Factors

• DOI: 10.1103/physrevlett.132.201901
• Publication Date: 2024-05-13T19:57:06Z
• Authors: Long-Bin Chen; Wen Chen; Feng Feng; Yu Jia
• Keywords: High Energy Physics - Phenomenology; High Energy Physics - Experiment (hep-ex); High Energy Physics - Lattice; High Energy Physics - Phenomenology (hep-ph); 0103 physical sciences; High Energy Physics - Lattice (hep-lat); FOS: Physical sciences; 01 natural sciences; High Energy Physics - Experiment

We calculate the next-to-next-to-leading-order (NNLO) QCD radiative correction to pion electromagnetic form factor with large momentum transfer. explicitly verify validity of collinear factorization two-loop order for this observable and obtain respective IR-finite hard-scattering kernel in closed form. The NNLO turns out be positive significant. Incorporating new ingredient correction, we then make a comprehensive comparison between finest theoretical predictions numerous data both space- timelike factors. Our phenomenological analysis provides strong constraint on second Gegenbauer moment light-cone distribution amplitude obtained from recent lattice studies. Published by American Physical Society 2024