2021/11/24 by С. В. Михайлов, Sergey Mikhailov, A. V. Pimikov +2
Mathematics · Physics and Astronomy · #Amplitude #Anomalous magnetic dipole moment #High-Energy Particle Collisions Research #Lattice (music) #Mathematical analysis #Mathematical physics #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Perturbation theory (quantum mechanics) #Physics #Pion #Power series #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #Radiative transfer #Renormalization #Renormalization group #Renormalon #hep-ex #hep-ph
paper · pdf · doi:10.1051/epjconf/202225803003
8 pages, 3 figures. Work dedicated to the memory of Maxim Polyakov, a deeply admired colleague and friend of ours. Presented at Virtual Tribute to Quark Confinement and the Hadron Spectrum, August 2nd-6th, 2021
arxiv created 2021/11/24 · openalex publication_date 2021/11/24 · openalex created_date 2021/12/06 · arxiv updated 2022/02/16 · openalex updated_date 2026/08/05
We study two versions of lightcone sum rules to calculate the γ^*γ→π0 transition form factor (TFF) within QCD. While the standard version is based on fixed-order perturbation theory by means of a power-series expansion in the strong coupling, the new method incorporates radiative corrections by renormalization-group summation and generates an expansion within a generalized fractional analytic perturbation theory involving only analytic couplings. Using this scheme, we determine the relative nonperturbative parameters and the first two Gegenbauer coefficients of the pion distribution amplitude (DA) to obtain TFF predictions in good agreement with the preliminary BESIII data, while the best-fit pion DA satisfies the most recent lattice constraints on the second moment of the pion DA at the three-loop level.