.png){kind=icon}
.png){kind=icon}
Return
Radiative return meets GVMD
.png){kind=icon}
OA
AI
DOI：10.1016/j.physletb.2026.140864.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
We improve the description of pion-photon interactions in the radiative return process
e+
e−
→
π+
π−
γ
at the next-to-leading order by including the pion form factor in the Feynman rules. We present a general calculation of the new amplitudes, and provide an implementation easy to interface with any Monte Carlo generator. We incorporate this framework into the event generator Phokhara and study several experimental configurations. Overall, we find percent-level effects appearing in angular differential cross section distributions at colliders whose centre-of-mass energies lie near the peak of the pion form factor. By contrast, total cross sections and distributions in charge-even variables show effects only at the permille level, or no visible differences at all. Finally, we compare the new predictions with KLOE measurements of the forward–backward asymmetry in order to assess the predictive power of the modifications.
Keywords:
Electron-positron colliders
Generalised vector meson dominance
Loop corrections
Pion form factor
Journal
IF:
4.5
Papers:
3.2W
Citations:
7.3W