Upper Limits on Electric and Weak Dipole Moments of W-Boson
Abstract
The total cross-sections of the reaction e+e- --> W+W-, as measured at LEP-II at centre-of-mass energies between 183 and 207 GeV are used to derive the upper limits on the parameters of CP-violating (P-odd and C-even) triple gauge-boson couplings WWγ and WWZ. The 95% CL limits |Z|<0.13 and |λZ|<0.31 are obtained assuming local SU(2)L x U(1)Y gauge invariance. Our results are comparable with the previous ones obtained through the analysis of the W decay products. We also discuss the upper limits on the electric dipole moment (EDM) of the W-boson, which follow from the precision measurements of the electron and neutron EDM.
0