TRIPLE GAUGE COUPLINGS (TGC'S)

$\mathit g{}^{{{\mathit Z}}}_{4}$

INSPIRE   PDGID:
S043GZ4
This coupling is $\mathit CP$-violating ($\mathit C$-violating and $\mathit P$-conserving).
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.30 \pm0.17}$ OUR AVERAGE
$-0.39$ ${}^{+0.19}_{-0.20}$ 1880 1
ABDALLAH
2008C
 DLPH ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $189 - 209$ GeV
$-0.02$ ${}^{+0.32}_{-0.33}$ 1065 2
ABBIENDI
2001H
 OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= 189 GeV
1  ABDALLAH 2008C determine this triple gauge coupling from the measurement of the spin density matrix elements in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit W}^{-}}$ $\rightarrow$ ( ${{\mathit q}}{{\mathit q}}$) ( ${{\mathit \ell}}{{\mathit \nu}}$), where ${{\mathit \ell}}$ = ${{\mathit e}}$ or ${{\mathit \mu}}$. Values of all other couplings are fixed to their standard model values.
2  ABBIENDI 2001H study ${{\mathit W}}$-pair events, with one leptonically and one hadronically decaying ${{\mathit W}}$. The coupling is extracted using information from the ${{\mathit W}}$ production angle together with decay angles from the leptonically decaying ${{\mathit W}}$.
References