Minimal vectorlike model in supersymmetric unification

Abstract

Compared to the minimal supersymmetric standard model, an extension by vectorlike fermions is able to explain the Higgs mass while retains the grand unification. We investigate the minimal vectorlike model by focusing on the vectorlike electroweak sector. We firstly derive the mass spectrum in the electroweak sector, then calculate the one-loop effects on the Higgs physics, and finally explore either vectorlike or neutralino dark matter. Collider constraints are briefly discussed.

Single production of vector-like quarks: the effects of large width, interference and NLO corrections

“…The NLO corrections have their largest impact in both cases when the jet has a high pseudo-rapidity and lies thus in the forward regime. We however recall that while in the inclusive case this jet can be either the spectator jet produced in association with the T quark or the one emerging from the decay of the W boson into a boosted and collimated Figure 16. Distributions of the pseudo-rapidity of the leading jet for single T production in association with a jet.…”

“…Heavy spin-1/2 particles transforming as triplets under the QCD gauge group and with the same left-handed and right-handed couplings to gauge bosons, known as Vector-Like Quarks (VLQ), play a central role in many Standard Model (SM) extensions which address the hierarchy problem. Those include composite Higgs models [1][2][3], extra-dimensional models [3][4][5][6], Little-Higgs models [7][8][9] and a sub-class of supersymmetric models [10][11][12][13][14][15][16]. The origin of these states, often simply discussed at the effective level, can be in many cases traced back to a theory in which the VLQs are composite states of a new strong dynamics [17][18][19].…”

Probing electroweak dark matter at 14 TeV LHC *

“…WIMP-like DM can be hosted in a variety of weakscale new physics. For instance, it can be identified as the neutral fermion in the fourth-generation lepton model [4,5], where there are mixing effects between the new leptons and SM leptons, the lightest neutralino in the minimal supersymmetric standard model (MSSM) [6], in the next-to-minimal supersymmetric standard model (NMSSM) [7], or the lightest neutral fermion in singletdoublet (SD) [8][9][10] and vector-like (VL) lepton model [11][12][13][14], where there is no direct mixing with SM leptons.…”

Road map through the desert: unification with vector-like fermions

“…The issue of gauge coupling unification in the presence of VL fermions is not a new idea and it received a lot of attention in the literarture, both before the launch of the LHC [14,15,16,17,18,19,20,21,22,23], and after [24,25,26,27,28,10]. Similar analyses within the SUSY framework were performed as well [29,30,31,32,33,34,35,36]. In most of the former studies only particular types and a limited number of VL representations were considered.…”