Abstract.
We present measurements of triple gauge boson coupling parameters using data recorded by the OPAL detector at LEP2, at a centre-of-mass energy of 172 GeV. A total of 120 W-pair candidates has been selected in the \({\rm q \bar q q \bar q}\), \({\rm q\bar q} \ell \bar\nu_\ell\) and \(\ell \bar \nu_\ell \bar\ell^\prime \nu_{\ell^\prime }\) decay channels, for an integrated luminosity of 10.4 pb\(^{-1}\). We use these data to determine several different anomalous coupling parameters using the measured cross-section and the distributions of kinematic variables. We measure \(\alpha_{B\phi} = 0.35^{+1.29}_{-1.07} \pm 0.38\), \(\alpha_{W\phi} = 0.00^{+0.30}_{-0.28} \pm 0.11\), \(\alpha_W = 0.18^{+0.49}_{-0.47} \pm 0.23\), \(\Delta g^{\rm z}_1 = -0.03^{+0.40}_{-0.37} \pm 0.14\), \(\Delta\kappa_\gamma ^{(HISZ)} = 0.03^{+0.55}_{-0.51} \pm 0.20\), and \(\Delta \kappa = 0.33^{+0.49}_{-0.46} \pm 0.21\). Combining the \(\alpha_{W\phi}\) result with our previous result obtained from the 161 GeV data sample we measure \(\alpha_{W\phi} = -0.08^{+0.28}_{-0.25} \pm 0.10\). All of these measurements are consistent with the Standard Model.
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Received: 16 September 1997 / Published online: 30 March 1998
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The OPAL Collaboration., Ackerstaff et al., K. Measurement of triple gauge boson couplings from \({\rm W^+W^-}\) production at \(\sqrt s=172\)GeV. Eur. Phys. J. C 2, 597–606 (1998). https://doi.org/10.1007/s100529800838
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DOI: https://doi.org/10.1007/s100529800838