Summary
We show that the longitudinal polarization asymmetry of the process e+e −L,R →hadrons with longitudinally polarized electron beam on top of the Z0 resonance is, to lowest order in the electroweak couplingα em, free of strong-interaction effects in the final state. Thus the uncertainty in the theoretical predictions produced by strong interactions is reduced by at least one power ofα em.
Riassunto
Si dimostra che l’asimmetria di polarizzazione longitudinale del processo e+e −L,R →adroni con elettroni longitudinalmente polarizzati, sul picco della risonanza Z0 ed all’ordine piú basso nella costante d’accoppiamento elettrodeboleα em, è libera da effetti di interazioni forti nello stato finale. Pertanto, l’indeterminazione nelle precisioni teoriche prodotte dalle interazioni forti è ridotta di (almeno) una potenza diα em.
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References
S. L. Glashow:Nucl. Phys.,20, 579 (1961)
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Lynn, B.W., Verzegnassi, C. Washing-out final-state strong interactions in the longitudinal polarization asymmetry for e+e−→hadron near the Z0 peak to lowest e.m. order. Nuov Cim A 94, 15–24 (1986). https://doi.org/10.1007/BF02894802
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DOI: https://doi.org/10.1007/BF02894802