EPJ Web of Conferences (Jan 2019)

Study of the process e+e-→π+π-γ with the CMD-3 detector at the e+e- collider VEPP-2000

  • Tolmachev S. S.,
  • Akhmetshin R. R.,
  • Amirkhanov A. N.,
  • Anisenkov A. V.,
  • Aulchenko V. M.,
  • Banzarov V. Sh.,
  • Bashtovoy N. S.,
  • Berkaev D. E.,
  • Bondar A. E.,
  • Bragin A. V.,
  • Eidelman S. I.,
  • Epifanov D. A.,
  • Epshteyn L. B.,
  • Erofeev A. L.,
  • Fedotovich G. V.,
  • Gayazov S. E.,
  • Grebenuk A. A.,
  • Gribanov S. S.,
  • Grigoriev D. N.,
  • Ignatov F. V.,
  • Ivanov V. L.,
  • Karpov S. V.,
  • Kazanin V. F.,
  • Kirpotin A. N.,
  • Koop I. A.,
  • Korobov A. A.,
  • Kozyrev A. N.,
  • Kozyrev E. A.,
  • Krokovny P. P.,
  • Kuzmenko A. E.,
  • Kuzmin A. S.,
  • Logashenko I. B.,
  • Lukin P. A.,
  • Mikhailov K. Yu.,
  • Okhapkin V. S.,
  • Pestov Yu. N.,
  • Popov A. S.,
  • Razuvaev G. P.,
  • Ruban A. A.,
  • Ryskulov N. M.,
  • Ryzhenenkov A. E.,
  • Semenov A. V.,
  • Shatunov Yu. M.,
  • Shatunov P. Yu.,
  • Shebalin V. E.,
  • Shemyakin D. N.,
  • Shwartz B. A.,
  • Shwartz D. B.,
  • Sibidanov A. L.,
  • Solodov E. P.,
  • Titov V. M.,
  • Talyshev A. A.,
  • Vorobiov A. I.,
  • Zemlyansky I. M.,
  • Yudinl Yu. V.

DOI
https://doi.org/10.1051/epjconf/201921204012
Journal volume & issue
Vol. 212
p. 04012

Abstract

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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.