Low fine-tuning in Yukawa-deflected gauge mediation

Abstract

We discuss a class of models with gauge-mediated supersymmetry breaking characterized by a non-unified messenger sector inducing non-standard gaugino mass ratios, as well as by additional contributions to the soft mass terms from a matter-messenger coupling. The well-known effect of this coupling is to generate A-terms at one-loop level, hence raising the Higgs mass without relying on super-heavy stops. At the same time, a hierarchy between Wino and gluino masses, as induced by the non-unified messenger fields, can greatly lower the radiative corrections to the Higgs soft mass term driven by the high-energy parameters, thus reducing the fine tuning. We search for models with low fine tuning within this scenario, and we discuss the spectrum, collider phenomenology, constraints, and prospects of the found solutions. We find that some setups are accessible or already excluded by searches at the Large Hadron Collider, and all our scenarios with a tuning better than about 2% can be tested at the International Linear Collider.

Sizable stop mixing in flavored gauge mediation models with discrete non-Abelian symmetries

“…As a result, consistency with the Higgs data [10][11][12] generally requires very heavy SU (3)-charged superpartner masses and/or high values of the messenger scale. This conclusion can be circumvented if the messenger fields can couple directly to the MSSM fields, as explored in [8,9,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]31] Of particular interest are the "flavored gauge mediation" models [14,[21][22][23][24][25][26][27][28][29][30][31][32][33]), for which there is nontrivial mixing of the SU (2) messenger doublets and the MSSM Higgs fields. These models allow for the generation of one-loop A terms at the messenger scale, alleviating the Higgs mass problem of minimal gauge mediation in the MSSM.…”

Exploring non-holomorphic soft terms in the framework of gauge mediated supersymmetry breaking

“…It is important to note that there are a few beyond the mGMSB analyses [102,[124][125][126][127][128] for example those involving matter-messenger interactions in which the trilinear holomorphic soft terms may arise at one-loop level, thus becoming non-vanishing at the messenger scale. In such situations one obtains a significantly large amount of radiative corrections to m h , a friendly feature to accommodate a Higgs boson as massive as 125 GeV in models JHEP01 (2018)158 away from mGMSB.…”