Study of the process e+e-→π+π-γ with the CMD-3 detector at the e+e- collider VEPP-2000
Budker Institute of Nuclear Physics SB RAS, Novosibirsk, 630090, Russia
2 Novosibirsk State University, Novosibirsk, 630090, Russia
3 Novosibirsk State Technical University, Novosibirsk, 630092, Russia
4 University of Victoria, Victoria, British Columbia, Canada V8W 3P6
5 Lebedev Physical Institute RAS, Moscow, 119333, Russia
* e-mail: email@example.com
Published online: 17 June 2019
Existing Monte-Carlo generators with radiative corrections to the e+e-→π+π- process are usually developed under the assumption that pions can be treated as pointlike particles. We study the e+e-→π+π-γ process with final-state radiation and test this assumption using simulated events from the MCGPJ generator based on the scalar QED hypothesis. In order to increase a fraction of events with FSR, the analysis was performed in the energy region to the left from the ρ-meson peak (660÷785 MeV) that is based on the integrated luminosity of about 8.4 pb-1. The experimental data for the photon energy spectrum agree with the simulation results at 1% level.
© The Authors, published by EDP Sciences, 2019
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