Measurement of triple gauge boson couplings from $W^+W^-$production at $\sqrt{s}$=172 ${GeV}$

The OPAL Collaboration:     K. Ackerstaff - et al.

doi:doi:10.1007/s100529800838

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2024 Impact factor 4.8

Particles and Fields

Eur. Phys. J. C 2, 597-606
DOI 10.1007/s100529800838

Measurement of triple gauge boson couplings from $\mathrm{W^+W^-}$ production at $\sqrt{s}$ =172 $\mathrm{GeV}$

The OPAL Collaboration, K.Ackerstaff⁸ et al.

⁸ CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland

Received: 16 September 1997 / Published online: 30 March 1998

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 $\mathrm{GeV}$ .A total of 120W-pair candidates has been selected in the $\mathrm{q\overline{q} }$ $\mathrm{q\overline{q} }$ , $\mathrm{q\overline{q} }$ $\ell\overline{\nu}_{\ell}$ and $\ell\overline{\nu}_{\ell}$ $\overline{\ell}^\prime\nu_{\ell^\prime}$ decay channels, for an integrated luminosity of 10.4pb^-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 $\alpha_{B\phi}$ = $0.35^{+1.29}_{-1.07}\pm0.38$ , $\alpha_{W\phi}$ = $0.00^{+0.30}_{-0.28}\pm0.11$ , $\alpha_W$ = $0.18^{+0.49}_{-0.47}\pm0.23$ , $\Delta g_1^{\mathrm{z}}$ = $-0.03^{+0.40}_{-0.37}\pm0.14$ , $\Delta \kappa_\gamma^{\tiny(HISZ)}$ = $0.03^{+0.55}_{-0.51}\pm0.20$ ,and $\Delta \kappa$ = $0.03^{+0.49}_{-0.46}\pm0.21$ .Combining the $\alpha_{W\phi}$ result with our previous result obtained from the 161 $\mathrm{GeV}$ data sample we measure $\alpha_{W\phi}$ = $-0.08^{+0.28}_{-0.25}\pm0.10$ .All of these measurements are consistent with the Standard Model.