Threshold effects on prediction for proton decay in non-supersymmetric E6 GUT with intermediate trinification symmetry

A minimal non-supersymmetric $E_6$ Grand Unified Theory without intermediate symmetry

“…In the present model A L = 1.25, A SL = 2.32, A SR = 2.20, corresponding to the beta function coefficients (b i , b i ) as well as the anomalous dimensions [9]. The other parameters take the usual values, f π = 139 MeV and m p = 938.3 MeV, α H = 0.012 GeV 3 , V ud = 0.974.…”

“…The novel feature of the present work is that the proposed model, guided by TeV-scale extended SM scenario and GUT threshold corrections, is consistent with proton lifetime bound even in absence of any intermediate symmetry. Unlike the existing GUT models with threshold effects [6][7][8][9], the proposed model shows that, the threshold corrections to the unification mass, is controlled by superheavy gauge bosons only, thereby minimising the uncertainty of the GUT predictions. Further it has the potential to address flavor-physics anomalies, Muon g − 2 anomaly and light neutrino masses.…”

Flavour anomalies and dark matter assisted unification in $SO(10)$ GUT

“…In the context of GUT, the popular models are SU (5) [35], SU (10) [12,[36][37][38][39][40][41][42][43] and E 6 [44][45][46][47][48][49][50][51], where many of the unsolved issues of the SM can be addressed. In most of the literature, it is found that all GUTs without any intermediate symmetry breaking and in the absence of supersymmetry, fails to unify the gauge couplings corresponding to three fundamental forces as described by SM.…”

Low scale trinification symmetry through effects of dimension-5 operators in $E_6$ grand unified theory with and without supersymmetry

“…The motivation for trinification lies in the unified description of both strong and electroweak interactions, while incorporating nice features of the conventional left-right symmetric (LRSM) models. Many E 6 GUT models with D-parity (D LR being a discrete left-right symmetry) [10,11] conserving trinification symmetry have been discussed [12][13][14][15][16] with phenomenological prediction.…”

“…It has been established through a theorem [15,16] that in all grand unified theories(GUTs) having trinification symmetry (G 333D ) as the highest intermediate symmetry, the electroweak mixing angle sin 2 θ W and the intermediate mass scale M I have vanishing contributions due to one (two) loop and gravitational as well as threshold corrections. It is noteworthy to mention that the D-parity conservation is solely responsible for this vanishing correction.…”