${{\mathit Z}}$ 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.

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

INSPIRE   JSON  (beta) PDGID:
S044GNL
VALUE DOCUMENT ID  COMMENT
$0.50076$ $\pm0.00076$ 1
LEP-SLC
2006
${\it{}E}^{\it{}ee}_{\rm{}cm}$ = $88 - 94$ GeV
1  From invisible ${{\mathit Z}}$-decay width.
References