Gauge mediation with light stops

Abstract

The mechanism of gauge mediated supersymmetry breaking (GMSB) solves the supersymmetric flavor problem although it requires superheavy stops to reproduce the experimental value (125 GeV) of the Higgs mass. A possible way out is to extend the MSSM Higgs sector with triplets which provide extra tree-level corrections to the Higgs mass. Triplets with neutral components getting vacuum expectation values (VEV) have the problem of generating a tree-level correction to the \rho parameter. We introduce supersymmetric triplets with hypercharges Y=(0,\pm 1), with a tree-level custodial SU(2)_L\otimes SU(2)_R global symmetry in the Higgs sector protecting the \rho parameter: a supersymmetric generalization of the Georgi-Machacek model. The renormalization group running from the messenger to the electroweak scale mildly breaks the custodial symmetry. We will present realistic low-scale scenarios, their main features being a Bino-like neutralino or right-handed stau as the NLSP, light (1 TeV) stops, exotic couplings (H^\pm W^\mp Z and H^{\pm\pm} W^\mp W^\mp) absent in the MSSM and proportional to the triplet VEV, and a possible (measurable) universality breaking of the Higgs couplings \lambda_{WZ}= \left(g_{hWW}/g_{hWW}^{SM}\right)/ \left(g_{hZZ}/g_{hZZ}^{SM}\right)\neq 1.