Hidden solution to the μ/Bμ problem in gauge mediation

We propose a solution to the μ/Bμ problem in gauge mediation. The novel feature of our solution is that it uses dynamics of the hidden sector, which is often present in models with dynamical supersymmetry breaking. We give an explicit example model of gauge mediation where a very simple messenger sector generates both μ and Bμ at one loop. The usual problem, that Bμ is then too large, is solved by strong renormalization effects from the hidden sector which suppress Bμ relative to μ. Our mechanism relies on an assumption about the signs of certain incalculable anomalous dimensions in the hidden sector. Making these assumptions not only allows us to solve the μ/Bμ problem but also leads to a characteristic superpartner spectrum which would be a smoking gun signal for our mechanism.