# New Fermions at the LHC and Mass of the Higgs Boson - High Energy Physics - Phenomenology

Abstract: Unification at M {GUT}\sim 3\times 10^{16} GeV of the three Standard ModelSM gauge couplings can be achieved by postulating the existence of a pair ofvectorlike fermions carrying SM charges and masses of order 300 GeV - 1 TeV.The presence of these fermions significantly modifies the vacuum stability andperturbativity bounds on the mass of the SM Higgs boson. The new vacuumstability bound in this extended SM is estimated to be 117 GeV, to be comparedwith the SM prediction of about 128 GeV. An upper bound of 190 GeV is obtainedbased on perturbativity arguments. The impact on these predictions of type Iseesaw physics is also discussed. The discovery of a relatively `light- Higgsboson with mass \sim 117 GeV could signal the presence of new vectorlikefermions within reach of the LHC.

Author: Ilia Gogoladze, Bin He, Qaisar Shafi

Source: https://arxiv.org/