Axion and neutralinos from supersymmetric extensions of the Standard Model with anomalous U(1)'s

We analyze the conditions under which some supersymmetric generalizations of a class of models descending from string theory allow ail axion in the physical spectrum, due to the presence of anomalous Abelian gauge interactions. The gauge structure of these constructions involve the Stukelberg supermultiplet and a supersymmetric version of the Wess-Zumino term for anomally cancellation. While these conditions are not satisfied by the MSSM superpotential, we show that ail axion-like particle appears in the spectrum if extra Standard Model singlets are present. We show that the minimal requirements are met by simple superpotentials in which the singlet superfield is charged under the anomalous U(1). The dark matter sector of these models include all axion and several neutralinos with all axino component. (C) 2008 Elsevier B.V. All rights reserved.