Epsilon(b) constrainsts on self-couplings of vector bosons
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1994-12-01
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Elsevier B.V.
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We analyze the constraints on possible anomalous contributions to the W+W-Z vertex coming from non-universal radiative corrections to the Z → bb̄ width. We parametrize these corrections in terms of ∈b and use the LEP data to establish the allowed values for the anomalous triple couplings. We examine all CP conserving effective operators that exhibit SU(2)L × U(1)Y gauge invariance and do not give any tree level contribution to the present experimental observables. For some of these operators our constraints are comparable with the bounds coming from a global fit of the oblique parameters, which evidences the increasing relevance of the precise measurement of the b-quark parameters at LEP for the search of new physics.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 339, n. 1-2, p. 119-126, 1994.