Search for heavy neutral and charged leptons in e+e− annihilation at
نویسندگان
چکیده
منابع مشابه
A Search for Neutral Heavy Leptons
In e+eannihilations at SPEAR we have searched for narrow neutral resonances in the eT and ~.ln channels for masses between .5 GeV/c 2 and 1.5 GeV/c2. No evidence for such states has been found. Under standard theoretical assumptions for production cross sections and decay branching ratios of heavy leptons a lower limit of 1.2 GeV/c 2 can be set on the mass. *FJork supported by the Energy Resear...
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The experimental implications of neutral heavy leptons N in e+eannihilation are examined. We calculate the production rate of both right-handed and left-handed N’s at SPEAR and PEP/PETRA energies and show that observation of the process e+e+ TN, N e (or /~)7r allows the determination of both the mass and handedness of N. (Submitted to Phys, Lett.) *Work supported in part by the Energy Research ...
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Four models are considered which contain heavy leptons beyond the three families of the standard model. Two are fourth-generation extensions of the standard model in which the right-handed heavy leptons are either isosinglets or in an isodoublet; the other two are motivated by the aspon model of CP violation. In all these models, the heavy neutrino can either be heavier than, or comparable in m...
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A review is given on the search for new heavy leptons in e+eand pj!i collisions. Invited talk at the XXl’Vth International Conference on High Energy Physics, Munich, Germany, August 4-10, 1988 1 5‘ * Wo;k’kpported by the Department of Energy, contract DE-AC03-76SF00515. tM&iling address: DESY F36, Notkestrafie 85, D 2000 Hamburg 52. Bitnet address: user F36WDB at node DHHDESYS. Search for new H...
متن کاملNeutral Heavy Leptons and Electroweak Baryogenesis
We investigate the possibility that baryogenesis occurs during the weak phase transition in a minimal extension of the Standard Model which contains extra neutral leptons and conserves total lepton number. The necessary CP-violating phases appear in the leptonic Yukawa couplings. We compute the CP-asymmetries in both the neutral and the charged lepton fluxes reflected in the unbroken phase. Usi...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)01074-5