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Physics of Atomic Nuclei 66 (2003) 2169-2177
Z-lineshape versus 4th generation masses
S. S. Bulanov, V. A. Novikov, L. B. Okun, A.N. Rozanov1, M. I. Vysotsky
LHCb Collaboration(s)

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.
1 :  CPPM - Centre de Physique des Particules de Marseille
Physique/Physique des Hautes Energies - Expérience
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