On the relation of the cosmological constraints on neutrino flavors to the width of the Z0

Details On the relation of the cosmological constraints on neutrino flavors to the width of the Z0 On the relation of the cosmological constraints on neutrino flavors to the width of the Z0

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phlb..141..337s&link_type=abstract

Physics Letters B, Volume 141, Issue 5-6, p. 337-341.

Physics

13

Scientific paper

The relationship between big bang nucleosynthesis constraints on the number of types of neutrinos and the width of the Z0 is discussed. The standard model with mν << mZ has a well known relationship between the width of the Z0, ΓZ, and the number of neutrinos, Nν. However, for a heavy neutrino, with 1 MeV <~ mν < mZ/2 there will be a contribution to the width of the Z0, which will not be counted by primordial nucleosynthesis. On the other hand, right-handed neutrinos or light supersymmetric ``inos'' may not couple directly to the Z0 and thus not contribute to ΓZ but could make a contribution to Nν. No model is cosmologically acceptable with more than 4 effective neutrinos (or 1 more than νe, νμ and ντ). If ΓZ >~ 3.4 GeV then other new massive particles must exist.

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