Study of QED processes e+ e- --> e+ e- gamma, e+ e- gamma gamma with the SND detector at VEPP-2M
M.N.Achasov, S.E.Baru, A.V.Bozhenok, A.D.Bukin, D.A.Bukin, S.V.Burdin,, T.V.Dimova, S.I.Dolinsky, V.P.Druzhinin, M.S.Dubrovin, I.A.Gaponenko,, V.B.Golubev, V.N.Ivanchenko, A.A.Korol, S.V.Koshuba, A.P.Lysenko,, I.N.Nesterenko, E.V.Pakhtusova, S.I.Serednyakov, V.V.Shary
TL;DR
This paper reports on measurements of QED processes involving electron-positron collisions producing photons, confirming QED predictions with high precision at the VEPP-2M collider.
Contribution
The study provides precise experimental data on e+ e- --> e+ e- gamma and e+ e- --> e+ e- gamma gamma processes at large angles, with no deviations from QED observed.
Findings
Measured energy and angular distributions of final particles.
Confirmed QED predictions within 3.8% and 10.3% accuracy.
No deviations from QED found in the studied processes.
Abstract
Results of the SND experiment at the VEPP-2M e+ e- collider on the QED processes e+ e- --> e+ e- gamma and e+ e- --> e+ e- gamma gamma with production at large angles are presented. Energy and angular distributions of the final particles were studied. No deviations from QED with an accuracy of 3.8% for the first process and 10.3% for the second were found.
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