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26 April 2024
 
  » arxiv » hep-ph/0301268

 Article overview



Z-lineshape versus 4th generation masses
S. S. Bulanov ; V. A. Novikov ; L. B. Okun ; A. N. Rozanov ; M. I. Vysotsky ;
Date 30 Dec 2002
Journal Phys.Atom.Nucl. 66 (2003) 2169-2177; Yad.Fiz. 66 (2003) 2219-2227
Subject hep-ph
AffiliationITEP, Moscow, Russia), A. N. Rozanov (CPPM, IN2P3, CNRS, Univ. Mediteranee, Marseilles, France and ITEP, Moscow, Russia), M. I. Vysotsky (ITEP, Moscow, Russia
AbstractThe dependence of the Z-resonance shape on the location of the threshold of the Nar{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<46.7pm 0.2 GeV.
Source arXiv, hep-ph/0301268
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