20-27 February 2019
HSE Study Center “Voronovo”
Europe/Moscow timezone

Study of the process e+e− → π+π−γ with the CMD - 3

22 Feb 2019, 20:00
HSE Study Center “Voronovo”

HSE Study Center “Voronovo”

Voronovskoe, Moscow Russian Federation
Board: 16
Poster [portrait A1 or landscape A0] Poster Session


Sergey Tolmachev


Physics program of the experiments with the CMD-3 includes precise measurement of the cross-sections of the e+e− → hadrons processes. Such measurements are necessary for the calculation of the hadronic contribution to the anomalous magnetic moment of the muon (α=(g−2)/2). Value of α is one of the great instrument for the Standard Model test. Among hadronic channels the process e+e− → π+π− is very important because it gives the main contribution to the value of hadronic part of α (~72%) in the low energy region (S < 2 GeV2).
Radiative corrections to the e+e− → π+π− cross-section are calculated under the hypothesis of point-like pions. In this work we study of the e+e− → π+π−γ process with photon radiation from the final state and test of the hypothesis about point-like pions used in the MCGPJ generator. In order to increase a part of events with FSR we study this process in the energy region left from the ρ-meson peak. The analysis of the process e+e− → π+π−γ was carried out in the energy region 660÷785 MeV and based on the integrated luminosity about 8.4 pb-1. The comparison of the experimental data for photon energy spectrum with the simulation results are in agreement with the hypothesis of point-like pions.

Primary author

Sergey Tolmachev

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