The data on the proton form factors in the timelike region from the BaBar, BESIII, and CMD-3 Collaborations are examined to have coherent pieces of information on the proton structure. Oscillations in the annihilation cross section, previously observed, are determined with better precision. The moduli of the individual form factors, determined for the first time, their ratios, and the angular asymmetry of the annihilation reaction e+e-→p¯p are discussed. Fits of the available data on the cross section, the effective form factor, and the form factor ratio, allow to propose a description of the electric and magnetic timelike form factors from the threshold up to the highest momenta.
New fit of timelike proton electromagnetic formfactors from e+e- colliders
Pacetti S.
Membro del Collaboration Group
2021
Abstract
The data on the proton form factors in the timelike region from the BaBar, BESIII, and CMD-3 Collaborations are examined to have coherent pieces of information on the proton structure. Oscillations in the annihilation cross section, previously observed, are determined with better precision. The moduli of the individual form factors, determined for the first time, their ratios, and the angular asymmetry of the annihilation reaction e+e-→p¯p are discussed. Fits of the available data on the cross section, the effective form factor, and the form factor ratio, allow to propose a description of the electric and magnetic timelike form factors from the threshold up to the highest momenta.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
