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28 March 2024
 
  » arxiv » 0801.2949

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Unitarity Bounds for Gauged Axionic Interactions and the Green-Schwarz Mechanism
Claudio Coriano ; Marco Guzzi ; Simone Morelli ;
Date 20 Jan 2008
AbstractWe analize the effective actions of anomalous models where a four-dimensional version of the Green-Schwarz mechanism is invoked for the cancellation of the anomalies and we compare it against those models where gauge invariance is restored by the presence of a Wess-Zumino term. Some issues concerning an apparent violation of unitarity of the mechanism, which requires Dolgov-Zakharov poles, are carefully examined, using a class of amplitudes analized in the past by Bouchiat-Iliopoulos-Meyer (BIM), and elaborating on previous studies. In the Wess-Zumino case we determine explicitely the unitarity bound using a realistic model of intersecting branes (the Madrid model) by studying the corresponding BIM amplitudes. This is shown to depend significantly on the St"uckelberg mass and on the coupling of the extra anomalous gauge bosons and allows to identify Standard-Model like regions (which are anomaly-free) from regions where the growth of certain amplitudes is dominated by the anomaly, separated by an inflection point. The bound can even be around 5-10 TeV’s for a $Z’$ mass around 1 TeV and varies sensitively with the anomalous coupling. The results for the WZ case are quite general and apply to all the models where an axion-like interaction is introduced as a generalization of the Peccei-Quinn mechanism, with a gauged axion .
Source arXiv, 0801.2949
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