Eur. Phys. J. C 21, 423-441 (2001)
Measurement of triple gauge-boson couplings at LEP energies up to 189 GeVThe ALEPH Collaboration A. Heister and et al.
Physikalisches Institut das RWTH-Aachen, 52056 Aachen, Germany
(Received: 28 February 2001 / Published online: 24 August 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )
The triple gauge-boson couplings involving the W are determined using data samples collected with the ALEPH detector at mean centre-of-mass energies of 183 GeV and 189 GeV, corresponding to integrated luminosities of 57 pb-1 and 174 pb-1, respectively. The couplings, gZ1, and , are measured using W-pair events, single-W production and single- production. Each coupling is measured individually with the other two couplings fixed at their standard model value. Including ALEPH results from lower energies, the 95% confidence level intervals for the deviation to the standard model are Fits are also presented where two or all three couplings are allowed to vary. In addition, W-pair events are used to set limits on the C- or P-violating couplings gV4, gV5, , and , where V denotes either or Z. No deviations from the standard model expectations are observed.
© Società Italiana di Fisica, Springer-Verlag 2001