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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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