Large squark and slepton masses for the first two generations in the anomalous U(1) SUSY breaking models

Considering that die soft SUSY breaking scalar masses come from a vacuum ex pectation value of the D-term for an external gauge multiplet, the renormal ization of the scaler masses is related to the gauge anomaly. Then, if the external gauge symmetry is anomaly-free and has no kinetic mixing with the other U(1) gauge symmetries, the scalar masses are non-renormalized at all orders assuming that the gaugino masses are negligibly small compared with the scalar masses. Motivated by this, we construct models where the sfermio n masses for the first-two generations are much heavier than the other supe rparticles in the minimal SUSY standard model in a framework of the anomalo us U(I) mediated SUSY breaking. In these models we have to introduce extra chiral multiplets with the masses as large as those for the first-two gener ation sfermions. We find that phenomenologically desirable patterns for the soft SUSY breaking terms can be obtained in the models. (C) 1999 Elsevier Science B.V. All rights reserved.