Summary
A further search for heavy leptons at the ADONE e+e− storage ring has revealed no events. This establishes, with 95% confidence, that, if a heavy lepton exists and is universally coupled only to ordinary leptons, its mass must be heavier than 1.4 GeV. If it is also coupled to the hadrons, its mass must be greater than 1 GeV, again with 95% confidence.
Riassunto
Un’ulteriore ricerca dei leptoni pesanti agli anelli di accumulazione e+e− ADONE, non ha rivelato alcun evento. Ciò permette di stabilire, con un livello di fiducia del 95%, che se esite un leptone pesante ed è accoppiato universalmente soltanto ai leptoni ordinari, la sua massa deve essere maggiore di 1.4 GeV. Se esso è accoppiato anche agli adroni, la sua massa deve essere maggiore di 1 GeV, al medesimo livello di fiducia del 95%.
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References
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Bernardini, M., Bollini, D., Brunini, P.L. et al. Limits of the mass of heavy leptons. Nuov Cim A 17, 383–390 (1973). https://doi.org/10.1007/BF02777944
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DOI: https://doi.org/10.1007/BF02777944