Anomalous U(1)_A and Electroweak Symmetry Breaking
  We suggest a new mechanism for electroweak symmetry breaking in the supersymmetric Standard Model. Our suggestion is based on the presence of an anomalous U(1)_A gauge symmetry, which naturally arises in the four dimensional superstring theory, and heavily relies on the value of the corresponding Fayet-Illiopoulos \xi-term. 
Ilia Gogoladze and Mirian Tsulaia