Z-lineshape versus 4th generation masses

Details Z-lineshape versus 4th generation masses Z-lineshape versus 4th generation masses

2003-01-30

arxiv.org/abs/hep-ph/0301268v2

Phys.Atom.Nucl. 66 (2003) 2169-2177; Yad.Fiz. 66 (2003) 2219-2227

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 figures, 1 table, LaTex; references added

Scientific paper

10.1134/1.1634324

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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