Authors: Yonatan Kahn Matthew McCullough Jesse Thaler
Publish Date: 2013/11/21
Volume: 2013, Issue: 11, Pages: 161-
Abstract
The discovery of a standardmodellike Higgs at 126 GeV and the absence of squark signals thus far at the LHC both point towards a minisplit spectrum for supersymmetry Within standard paradigms it is nontrivial to realize a minisplit spectrum with heavier sfermions but lighter gauginos while simultaneously generating Higgs sector soft terms of the correct magnitude suggesting the need for new models of supersymmetry breaking and mediation In this paper we present a new approach to minisplit model building based on gauge mediation by “auxiliary groups” which are the anomalyfree continuous symmetries of the standard model in the limit of vanishing Yukawa couplings In addition to the wellknown flavor SU3 F and baryonminuslepton U1 B−L groups we find that an additional U1 H acting on the Higgs doublets alone can be used to generate Higgs soft masses and Bterms necessary for a complete model of minisplit Auxiliary gauge mediation is a special case of Higgsed gauge mediation and we review the resulting twoloop scalar soft terms as well as threeloop gaugino masses Along the way we present a complete twoloop calculation of Aterms and Bterms in gauge mediation which — contrary to a common misconception — includes a nonzero contribution at the messenger threshold which can be sizable in models with light gauginos We present several phenomenologically acceptable minisplit spectra arising from auxiliary gauge mediation and highlight a complete minimal model which realizes the required spectrum and Higgs sector soft terms with a single U1 X auxiliary gauge symmetry We discuss possible experimental consequences
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