${{\mathit Z}}$ COUPLINGS TO NEUTRAL LEPTONS

Averaging over neutrino species, the invisible ${{\mathit Z}}$ decay width determines the effective neutrino coupling $\mathit g{}^{{{\mathit \nu}_{{{{{\mathit \ell}}}}}}}$. For $\mathit g{}^{{{\mathit \nu}_{{{e}}}}}$ and $\mathit g{}^{{{\mathit \nu}_{{{\mu}}}}}$, ${{\mathit \nu}_{{{e}}}}{{\mathit e}}$ and ${{\mathit \nu}_{{{\mu}}}}{{\mathit e}}$ scattering results are combined with $\mathit g{}^{{{\mathit e}}}_{\mathit A}$ and $\mathit g{}^{{{\mathit e}}}_{\mathit V}$ measurements at the ${{\mathit Z}}$ mass to obtain $\mathit g{}^{{{\mathit \nu}_{{{e}}}}}$ and $\mathit g{}^{{{\mathit \nu}_{{{\mu}}}}}$ following NOVIKOV 1993C.

$\mathit g{}^{{{\mathit \nu}_{{{\mu}}}}}$

INSPIRE   JSON  (beta) PDGID:
S044GNM
VALUE DOCUMENT ID TECN  COMMENT
$0.502$ $\pm0.017$ 1
VILAIN
1994
CHM2 From ${{\mathit \nu}_{{{\mu}}}}{{\mathit e}}$ scattering
1  VILAIN 1994 derive this value from their measurement of the couplings $\mathit g{}^{{{\mathit e}} {{\mathit \nu}_{{{\mu}}}}}_{\mathit A}$ = $-0.503$ $\pm0.017$ and $\mathit g{}^{{{\mathit e}} {{\mathit \nu}_{{{\mu}}}}}_{\mathit V}$ = $-0.035$ $\pm0.017$ obtained from ${{\mathit \nu}_{{{\mu}}}}{{\mathit e}}$ scattering. We have re-evaluated this value using the current PDG values for $\mathit g{}^{{{\mathit e}}}_{\mathit A}$ and $\mathit g{}^{{{\mathit e}}}_{\mathit V}$.
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