Z-lineshape versus 4th generation masses
classification
✦ hep-ph
keywords
generationz-lineshapeanalyzedboundscomparisondatadependencederived
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The dependence of the Z-resonance shape on the location of the threshold of the N\bar{N} production (N is the 4th generation neutrino) is analyzed. The bounds on the existence of 4th generation are derived from the comparison of the theoretical expression for the Z-lineshape with the experimental data. The 4th generation is excluded at 95% C. L. for m_N<46.7\pm 0.2 GeV.
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