2014/12/31 by Xu Feng, Sinya Aoki, S. Hashimoto +3 · 5 citations
Physics and Astronomy · #Fermion #Form factor (electronics) #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Mathematical physics #Momentum transfer #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #hep-ex #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.91.054504
published as Phys. Rev. D 91, 054504 (2015) · 34 pages, 14 figures, 4 tables. v3, minor changes are made, version accepted for publication in PRD
arxiv created 2015/03/05 · openalex publication_date 2015/03/11 · arxiv updated 2015/03/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We perform a nonperturbative lattice calculation of the complex phase and modulus of the pion form factor in the timelike momentum region using the finite-volume technique. We use two ensembles of 2+1-flavor overlap fermions at pion masses m_\ensuremathπ=380 and 290 MeV. By calculating the I=1 correlators in the center-of-mass and three moving frames, we obtain the form factor at ten different values of the timelike momentum transfer around the vector resonance. We compare the results with the phenomenological model of Gounaris-Sakurai and its variant.