Betts, Stephen T.; (1999) A measurement of triple gauge boson couplings from e+e- collisions at 183-189 GeV. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Measurements of the trilinear gauge boson vertex coupling parameters based on data collected in 1997 and 1998 by the OPAL detector at LEP are presented in this thesis. Integrated luminosities of 57fb-1 at √s = 183GeV and 183fb-1 at √s = 189GeV were collected in 1997 and 1998 respectively. The selected data samples comprise 247 events at √s = 183GeV and 747 at √s = 189GeV. The parameters were measured using a Near Neighbour Maximum Likelihood analysis; the Near Neighbour technique is a method by which a differential cross-section or probability density at a single position in phase- space may be obtained from a large reference sample of simulated events. The main parameters measured are the αw-αwΦ-αBΦ set (for the 1997 data) and λ-Δg1z-Δγ set (for the 1998 data); these two sets of parameters were chosen as they may have anomalous values without violating the SU(2)Lx U(l) Y symmetry of the Electroweak Lagrangian. The measured parameter values are [equation] from the 1998 data. The first quoted error is statistical and the second is the systematic uncertainty. All of these values are consistent with zero, which is the value for each of the parameters predicted by the Standard Model.

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