Abstract
We discuss the thermal evolution of the spurion and messenger fields of ordinary gauge mediation models taking into account the Standard Model degrees of freedom. It is shown that for thermalized messengers the metastable susy breaking vacuum becomes thermally selected provided that the susy breaking sector is sufficiently weakly coupled to messengers or to any other observable field.
Highlights
Gauge mediation is an attractive way of generating soft susy breaking in the Supersymmetric Standard Model [1]-[8]
Since the details of the hidden sector are often phenomenologically irrelevant, the hidden sector is parameterized by a singlet field X which is a spurion of susy breaking and messengers φ, φthat through gauge interactions communicate susy breaking from the hidden sector to the Supersymmetric Standard Model fields
In this Letter, we show that the Supersymmetric Standard Model (SSM) degrees of freedom can change the thermal history of the gauge mediation models in the limit of small coupling between the susy breaking and the messenger sector
Summary
Gauge mediation is an attractive way of generating soft susy breaking in the Supersymmetric Standard Model [1]-[8]. One has either to turn to models with locally stable origin and a mass hierarchy between sfermions and gauginos (ISS [12] and other direct mediation models fall to this category deformations of the ISS can evade this problem, [13] is a first example) or to look for ways to stabilize the spurion at an X = 0 minimum. The former direction conflicts with a light Higgs necessary for the generation of the electroweak scale, except if one is ready to accept a more severe fine tuning. The metastable vacuum is realized without the domination of the energy density of the universe by the spurion and without a late entropy production
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