Heavy Lepton Production in e^+e^- Annihilation : Global Properties and Decay Distributions

概要

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We first enumerate several global properites of e^+e^- annihilation, which were left untouched in previous studies, as evidences of a heavy lepton with the mass of 1.8 GeV. As for the charged energy fraction in e^+e^- annihilation, we note that the effect of heavy lepton productions superimposed on the linearly decreasing background parametrized as r_h=-0.0014√<s>+0.632 can give a satisfactory fit to the data up to √<s> 〜8GeV (where √<s> is the total c.m. energy). In this case, the charged energy fraction at PEP and PETRA energies is expected to come far below the naive application of the Llewellyn-Smith-Pais lower bound. We also compare the heavy lepton interpretation of the eμ events with other interpretations, and we argue that the 1.8 GeV heavy lepton gives the most plausible interpretation. Finally we discuss the observed eμcross section and momentum distributions in terms of this heavy lepton with a general structure of the weak current and with an arbitrary mass for the associated neutrino.
理論物理学刊行会の論文
1976-07-25