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 ρ parameter. We introduce supersymmetric triplets with hypercharges Y = (0, ±1), with a tree-level custodial SU(2) L ⊗ SU(2) R global symmetry in the Higgs sector protecting the ρ 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 ± W ∓ Z and H ±± W ∓ W ∓ ) absent in the MSSM and proportional to the triplet VEV, and a possible (measurable) universality breaking of the Higgs couplings λ W Z = g hWW /g SM hWW / g hZZ /g SM hZZ = 1.

Diphoton and diboson probes of fermiophobic Higgs bosons at the LHC

“…These 'fermiophobic' Higgs bosons have many generic phenomenological features which have been considered for some time [3][4][5][6][7][8][9][10][11][12][13][14][15] and searched for previously at LEP [16][17][18][19], Tevatron [20,21], and LHC [22]. They can be found in 'Type I' two Higgs doublet models [23] in the large tan β limit [15,24,25] as well as Higgs triplet models [26][27][28][29][30][31][32][33] including the well known Georgi-Macachek (GM) model [34] and its variations [35,36,36,37,[37][38][39][40][41][42] or their supersymmetric incarnations [43][44][45][46][47]…”