منابع مشابه
Gauge Invariance and Anomalous Gauge Boson Couplings
Using the S–matrix pinch technique we obtain to one loop order, gauge independent γWW and ZWW vertices in the context of the standard model, with all incoming momenta off–shell. We show that the vertices so constructed satisfy simple QED–like Ward identities. These gauge invariant vertices give rise to expressions for the magnetic dipole and electric quadrupole form factors of the W gauge boson...
متن کاملBounding anomalous gauge-boson couplings.
We investigate indirect phenomenological bounds on anomalous three-gauge-boson couplings. We do so by systematically determining their one-loop implications for precision electroweak experiments. We find that these loop-induced effects cannot be parametrized purely in terms of the parameters S, T and U . Like some other authors, we find many cancellations among the loop-induced effects, and we ...
متن کاملǫ′/ǫ And Anomalous Gauge Boson Couplings
We study ǫ/ǫ in the Standard Model and ǫ/ǫ due to anomalous WWγ and WWZ interactions as a function of the top quark mass. In the Standard Model, ǫ/ǫ is in the range 10−3 ∼ 10−4 for the central value of top quark mass reported by CDF. The anomalous gauge couplings can have large contributions to the CP violating I = 2 amplitude in K → ππ. Within the allowed regions for the anomalous gauge coupli...
متن کاملLoops , Cutoffs and Anomalous Gauge Boson Couplings †
We discuss several issues regarding analyses which use loop calculations to put constraints on anomalous trilinear gauge boson couplings (TGC's). Many such analyses give far too stringent bounds. This is independent of questions of gauge invariance, contrary to the recent claims of de Rújula et. al., since the lagrangians used in these calculations are gauge invariant, but the SU (2) L × U (1) ...
متن کاملAnomalous triple and quartic gauge boson couplings
This article reviews some recent developments in the analysis of anomalous triple and quartic vector boson couplings that have been discussed at the UK Phenomenology Workshop on Collider Physics 1999 in Durham.
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1995
ISSN: 0556-2821
DOI: 10.1103/physrevd.51.6484