Summary
A study of the timelike reaction e+e-→μ∓μ± and of its comparison with the spacelike dominated reaction e+e−→e±e± allows us to establish the validity of QED in terms of production angular distributions, absolute rates, energy dependence and angular correlations between the pair of final-state leptons, in two very different ranges of invariant four-momentum transfer. No sign of QED break is detected in the electromagnetic interaction of leptons and the muon behaves like a heavy electron, within the accuracy of the present investigation.
Riassunto
Si è compiuto uno studio della reazione «timelike» e+e-→μ∓μ± ed un confronto di questa con la reazione e+e−→e±e± nella quale la parte «spacelike» è dominante. Si sono studiate le distribuzioni angolari delle particelle prodotte, la loro dipendenza dall'energia, le correlazioni geometriche fra le coppie di leptoni nello stato finale, i valori assoluti delle sezioni d'urto, al fine di stabilire la validità dell'elettrodinamica quantica in due intervalli diversi di quadrimomento trasferito. Entro gli errori sperimentali (±8%) non si trova alcuna evidenza di violazione della elettrodinamica quantica nell'interazione elettromagnetica dei leptoni, ed il muone si comporta come un elettrone pesante.
Резюме
Исследование времениподобной реакции e+e-→μ∓μ± и ее сравнение с пространственноподобной доминирующей реакцией e+e−→e±e± позволяет нам установить справедливость квантовой электродинамики в терминах угловых распределений рождения, авсолютных интенсивностей, энергетической зависимости и углобых корреляций между парами лептонов в конечном состоянии, в двух очень различиых областях инвариантного четырехмерного передаваемого импульса. Не определен знак нарушения квантовой электродинамики и мюон ведет себя подобно тяжелому электрону в пределах точности настоящего исследования.
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References
V. Alles-Borelli, M. Bernardini, D. Bollini, P. L. Brunini, E. Fiorentino, T. Massam, L. Monari, F. Palmonari andA. Zichichi:Nuovo Cimento,7 A, 345 (1972).
For a complete description of the set-up, seeV. Alles-Borelli, M. Bernardini, D. Bollini, E. Fiorentino, P. L. Frabetti, T. Massam, L. Monari, F. Palmonari, F. Zetti andA. Zichichi:An experimental set-up to study charged final states from e+e− interactions, presented to theLVI Annual Conference of the Italian Physical Society, Venice, 28 October–3 November 1970.
S. Tazzari:Considerations on a luminosity monitor at ADONE, LNF-67/23 (24/3/1967).
V. Alles-Borelli, M. Bernardini, D. Bollini, P. L. Brunini, T. Massam, L. Monari, F. Palmonari andA. Zichichi:Lett. Nuovo Cimento,4, 1151 (1970).
S. Tavernier: Thèse de Doctorat de III cycle, Orsay, RI 68/7 (May 1968).
G. Bonneau andF. Martin:Nucl. Phys.,27 B, 381 (1971).
V. Alles-Borelli, M. Bernardini, D. Bollini, P. L. Brunini, E. Fiorentino, T. Massam, L. Monari, F. Palmonari andA. Zichichi:Experimental proof of the inadequacy of the peaking approximation in radiative corrections, paper submitted to theInternational Conference on Elementary Particles, Amsterdam, 30 June–6 July 1971.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02785259.
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Alles-Borelli, V., Bernardini, M., Bollini, D. et al. A check of quantum electrodynamics and of electron-muon equivalence. Nuov Cim A 7, 330–344 (1972). https://doi.org/10.1007/BF02832834
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DOI: https://doi.org/10.1007/BF02832834