Z' Gauge Models from Strings

Details Z' Gauge Models from Strings Z' Gauge Models from Strings

1997-07-31

arxiv.org/abs/hep-ph/9707541v1

Nucl.Phys.Proc.Suppl. 62 (1998) 187-196

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages + 2 eps figures

Scientific paper

10.1016/S0920-5632(97)00656-7

Potentially realistic string models often contain additional abelian gauge factors besides the standard model group. The consequences of such extended gauge structure are manifold both for theory and phenomenology as I show focussing in the simplest case of just one additional non-anomalous U(1)'. First, I discuss the possible symmetry breaking patterns according to the scale at which the U(1)' symmetry gets broken: in the first case, that scale must be below ~ 1 TeV to avoid fine-tuning; in the second case, the breaking can take place along a flat direction at an intermediate scale between the string scale and the electroweak scale. In both cases, I present a number of the generic implications expected, e.g. for the mu problem, Z' and Higgs physics, dark matter and fermion masses.

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