Measurement of Boson Self Couplings at LEP and Search for Anomalies
Martin Weber
Abstract
With center of mass energies up to 209 GeV of LEP II, massive W and Z bosons can be produced in pairs and jointly with photons. This allows to study boson-boson couplings. Since the W and Z bosons are unstable and decay into fermions, two- and four-fermion final states, accompanied possibly by photons, play an important role for these measurements. The couplings of the W to other bosons have been measured to be g1Z = 0.990+0.023-0.024, kappagamma = 0.896+0.058-0.056, and lambdagamma = -0.023 +0.025 -0.023. They are in agreement with the Standard Model expectation of g1Z = 1, kappagamma = 1, and lambdagamma = 0. No sign for couplings of three neutral bosons, parametrized by the couplings fiV and hiV, and for anomalous couplings of four gauge bosons, parametrized by a0, an and ac has been found.
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