Summary
A study of 1824 e+e−→e±e∓ events in the total centre-of-mass energy range from 1.6 GeV to 2.0 GeV, allows one to establish that production angular distributions, a collinearity and acoplanarity distributions, and absolute value of the cross-sections and their energy-dependence, follow QED predictions including first-order radiative corrections. In particular, the absolute value of the cross-section and the power of its energy-dependence agree with theoretical expectations within ±6% and ±2%, respectively. The inadequacy of the peaking approximation in our experimental conditions of observations has been measured to be (2.8±0.4)%.
Riassunto
Sono state studiate 1824 interazioni e+e−→e±e∓ con valori dell'energia totale compresi nell'intervallo (1.6÷2.0) GeV. I valori assoluti delle sezioni d'urto, la loro dipendenza dall'energia, le distribuzioni angolari e le distribuzioni di acollinearità e di acoplanarità delle particelle prodotte sono in accordo con le previsioni della elettrodinamica quantica. Tali previsioni sono state calcolate tenendo conto delle correzioni radiative al primo ordine. L'accordo tra previsioni teoriche e risultati sperimentali è di ±6% per il valore assoluto della sezione d'urto, e di ±2% per la sua dipendenza esponenziale dall'energia. È stato inoltre stabilito che la «peaking approximation» devia del (2.8±0.4)% nelle correzioni radiative al primo ordine.
Резюме
Исследование 1824 событий e+e−→e±e∓ в области полной энергии в системе центра масс от 1.6 ГэВ до 2.0 ГэВ позволяет нам уастановить, что утловые распределения рождения, распределения коллинеарности и компланарности, абсолютные значения поперечных сечений и их энергетическая зависимость следуют предсказаниям квантовой электродинамики, включая радиационные поправки первого порядка.
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References
For a complete description of the set-up, seeV. Alles-Borelli, M. Bernardini, D. Bollini, E. Fiorentino, P. L. Frabetti, T. Massam, L. Monari, P. Palmonari, F. Zetti andA. Zichichi:An experimental set-up to study charged final states from the e+e− interaction, presented at theLVI Annual Conference of the Italian Physical Society, Venice, 28 October–3 November 1970.
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V. Alles-Borelli, M. Bernardini, D. Bollini, P. L. Brunini, E. Fiorentino, T. Massam, L. Monari, F. Palmonari andA. Zichichi:Lett. Nuovo Cimento,2 A, 376 (1971).
V. Alles-Borelli, M. Bernardini, D. Bollini, P. L. Brunini, T. Massam, L. Monari, F. Palmonari andA. Zichichi:Lett. Nuovo Cimento,4, 1156 (1970). This work on the search for heavy leptons has raised some interest: see, for example,A. K. Mann:Lett. Nuovo Cimento,1, 486 (1971);J. J. Sakurai:Lett. Nuovo Cimento, 1, 624 (1971).
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02785260.
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Alles-Borelli, V., Bernardini, M., Bollini, D. et al. Direct check of QED in e+e− interactions at highq 2-values. Nuov Cim A 7, 345–362 (1972). https://doi.org/10.1007/BF02832835
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DOI: https://doi.org/10.1007/BF02832835