Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-03-12
Nucl.Phys.B789:133-174,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
50 pages, 16 figures, replaced with revised final version
Scientific paper
10.1016/j.nuclphysb.2007.07.027
We elaborate on an extension of the Standard Model with a gauge structure enlarged by a single anomalous U(1), where the presence of a Wess-Zumino term is motivated by the Green-Schwarz mechanism of string theory. The additional gauge interaction is anomalous and requires an axion for anomaly cancelation. The pseudoscalar implements the St\"{u}ckelberg mechanism and undergoes mixing with the standard Higgs sector to render the additional U(1) massive. We consider a 2-Higgs doublet model. We show that the anomalous effective vertices involving neutral currents are potentially observable. We clarify their role in the case of simple processes such as $Z^*\to \gamma \gamma$, which are at variance with respect to the Standard Model. A brief discussion of the implications of these studies for the LHC is included.
Coriano' Claudio
Irges Nikos
Morelli Simone
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