On the anomalous U(1) in free fermionic superstring models

Details On the anomalous U(1) in free fermionic superstring models On the anomalous U(1) in free fermionic superstring models

1997-11-14

arxiv.org/abs/hep-ph/9711339v2

Int.J.Mod.Phys. A14 (1999) 2335-2356

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages. Standard Latex. Reference added

Scientific paper

10.1142/S0217751X99001172

The realistic free fermionic models have had an intriguing success in explaining different properties of the observed particle spectrum. In this paper we discuss in some detail the anomalous U(1) symmetry which exists in these models. We study the properties of the anomalous U(1) in both the more realistic NAHE--based free fermionic models and those in a general NAHE class. Appearance of an anomalous U(1) in the more realistic NAHE models is shown to be an effect of reduction of world-sheet supersymmetry from (2,2) to (2,0). We show, however, that in more general (2,1) and (2,0) models, all U(1) can remain anomaly-free under certain conditions. Several phenomenological issues related to the anomalous U(1) are discussed. In particular, we note that in some examples the anomalous U(1) arises from the breaking $E_6 -> SO(10) X U(1)_A$, resulting in $U(1)_A$ being family universal.

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