Z-lineshape versus 4th generation masses
High Energy Physics - Phenomenology
2009-11-10 v2
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0301268,
title = {Z-lineshape versus 4th generation masses},
author = {S. S. Bulanov and V. A. Novikov and L. B. Okun and A. N. Rozanov and M. I. Vysotsky},
journal= {arXiv preprint arXiv:hep-ph/0301268},
year = {2009}
}
Comments
17 pages, 5 figures, 1 table, LaTex; references added