B − L Mediated Supersymmetry Breaking

If the superpartners of the standard model fields find out about supersymmetry breaking from the standard gauge interactions, then the superpartner spectrum can be computed in terms of few parameters, and unwanted flavor-changing neutral currents are suppressed. This standard gauge mediated supersymmetry breaking (SGMSB) scenario requires “messenger” superfields charged under the standard gauge group, with a nonsupersymmetric spectrum. In the usual SGMSB models [1], where the vacuum expectation values (VEV’s) of the scalarand F components of a gauge singlet superfield give the masses of the messenger fields, only false vacua have experimentally viable properties [2, 3]. The true vacuum may become viable if a second gauge singlet is included [2, 3], but in this case there are many independent parameters. If mass terms for the messenger fields are included in the superpotential, then simple SGMSB models can be constructed [4]. It remains, though, to be shown that this simplicity is