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Z-lineshape versus 4th generation masses

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.
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http://hal.in2p3.fr/in2p3-00151758
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Submitted on : Tuesday, June 5, 2007 - 11:24:57 AM
Last modification on : Thursday, January 18, 2018 - 1:50:49 AM

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S.S. Bulanov, V. A. Novikov, L. B. Okun, A.N. Rozanov, M. I. Vysotsky. Z-lineshape versus 4th generation masses. Physics of Atomic Nuclei / Yadernaya Fizika, MAIK Nauka/Interperiodica, 2003, 66, pp.2169-2177. ⟨10.1134/1.1634324⟩. ⟨in2p3-00151758⟩

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