Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-16
Phys.Rev. D57 (1998) 2771-2784
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages (Latex), 14 figures (Postscript)
Scientific paper
10.1103/PhysRevD.57.2771
We study quantum effects of exotic heavy leptons on the production of two vector bosons in e^+e^- annihilation. We present closed analytic expressions for vector-boson self-couplings and differential cross sections, within the framework of two favourable new-physics scenarios: (i) the fourth-generation Majorana-neutrino model and (ii) an E_6-inspired model with sequential mirror isodoublets. We constrain these models by requiring that their contributions to the oblique electroweak parameters be compatible with a recent global fit to high-precision data. We then systematically analyze the loop-induced deviations in the LEP2 cross section of e^+e^- -> W^+W^- predicted by the models thus confined.
Diener K.-P. O.
Kniehl Bernd A.
Pilaftsis Apostolos
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