sin2θW,αs, and the proton lifetime in SU(8) multigenerational grand unification

1984 ◽  
Vol 30 (7) ◽  
pp. 1598-1600 ◽  
Author(s):  
Suk Koo Yun
Keyword(s):  
Grand Unification ◽  
Proton Lifetime

scholarly journals Supersymmetric grand unification under siege: Proton lifetime upper bound

2000 ◽  
Vol 63 (3) ◽  
Author(s):  
Radovan Dermíšek ◽  
Arash Mafi ◽  
Stuart Raby
Keyword(s):  
Upper Bound ◽  
Grand Unification ◽  
Proton Lifetime

TWO-LOOP RENORMALIZATION GROUP CORRECTIONS IN SO(10) AXION MODELS AND PROTON LIFETIME

1989 ◽  
Vol 04 (03) ◽  
pp. 607-615 ◽  
Author(s):  
XING-MIN WANG
Keyword(s):  
Renormalization Group ◽  
Experimental Error ◽  
Mass Scale ◽  
Grand Unification ◽  
Error Range ◽  
Renormalization Group Equations ◽  
Proton Lifetime

A simplified way to calculate the two-loop corrections to the renormalization group equations is investigated and applied to two SO(10) axion models. It is found that the grand unification mass scale Mx is reduced by a factor ~ 1.5 – 3. And in both models, there exist solutions with Mx ~ 1015 Gev , corresponding to a proton lifetime [Formula: see text] when sin 2 θw, αs and αe are chosen within the experimental error range.

scholarly journals Threshold effects in SO(10) models with one intermediate breaking scale

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Davide Meloni ◽  
Tommy Ohlsson ◽  
Marcus Pernow
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Particle Physics ◽  
Gauge Coupling ◽  
Grand Unification ◽  
Threshold Effects ◽  
The Standard Model ◽  
Proton Lifetime ◽  
Supersymmetric Theories ◽  
Breaking Scale

AbstractDespite the successes of the Standard Model of particle physics, it is known to suffer from a number of deficiencies. Several of these can be addressed within non-supersymmetric theories of grand unification based on $$\text {SO}(10)$$ SO ( 10 ) . However, achieving gauge coupling unification in such theories is known to require additional physics below the unification scale, such as symmetry breaking in multiple steps. Many such models are disfavored due to bounds on the proton lifetime. Corrections arising from threshold effects can, however, modify these conclusions. We analyze all seven relevant breaking chains with one intermediate symmetry breaking scale, assuming the “survival hypothesis” for the scalar masses. Two are allowed by proton lifetime and two are disfavored by a failure to unify the gauge couplings. The remaining three unify at a too low scale, but can be salvaged by various amounts of threshold corrections. We parametrize this and thereby rank the models by the size of the threshold corrections required to save them.

OVERVIEW OF SUSY GUT MODELS OF NEUTRINO MIXING

2003 ◽  
Vol 18 (22) ◽  
pp. 3971-3979 ◽  
Author(s):  
S.M. BARR
Keyword(s):  
Grand Unification ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Neutrino Masses And Mixings

A brief review is given of some ideas for explaining neutrino masses and mixings within the context of supersymmetric grand unification. Emphasis is put on so-called lopsided models.

scholarly journals Observable proton decay in flipped SU(5)

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Maria Mehmood ◽  
Mansoor Ur Rehman ◽  
Qaisar Shafi
Keyword(s):  
Neutrino Mass ◽  
Gauge Coupling ◽  
Proton Decay ◽  
Type I ◽  
Mass Model ◽  
Intermediate Scale ◽  
Decay Channels ◽  
Proton Lifetime ◽  
Hybrid Inflation ◽  
Neutrino Mass Models

Abstract We explore proton decay in a class of realistic supersymmetric flipped SU(5) models supplemented by a U(1)R symmetry which plays an essential role in implementing hybrid inflation. Two distinct neutrino mass models, based on inverse seesaw and type I seesaw, are identified, with the latter arising from the breaking of U(1)R by nonrenormalizable superpotential terms. Depending on the neutrino mass model an appropriate set of intermediate scale color triplets from the Higgs superfields play a key role in proton decay channels that include p → (e+, μ+) π0, p → (e+, μ+) K0, p →$$ \overline{v}{\pi}^{+} $$ v ¯ π + , and p →$$ \overline{v}{K}^{+} $$ v ¯ K + . We identify regions of the parameter space that yield proton lifetime estimates which are testable at Hyper-Kamiokande and other next generation experiments. We discuss how gauge coupling unification in the presence of intermediate scale particles is realized, and a Z4 symmetry is utilized to show how such intermediate scales can arise in flipped SU(5). Finally, we compare our predictions for proton decay with previous work based on SU(5) and flipped SU(5).

scholarly journals Construction and Characterization of Representations of SU(7) for GUT Model Builders

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1044
Author(s):  
Daniel Jones ◽  
Jeffery A. Secrest
Keyword(s):  
Gauge Symmetry ◽  
Symmetry Group ◽  
Lie Group ◽  
Cartan Subalgebra ◽  
Natural Extension ◽  
Grand Unification ◽  
Raising And Lowering Operators ◽  
Higher Dimensional ◽  
Lowering Operators

The natural extension to the SU(5) Georgi-Glashow grand unification model is to enlarge the gauge symmetry group. In this work, the SU(7) symmetry group is examined. The Cartan subalgebra is determined along with their commutation relations. The associated roots and weights of the SU(7) algebra are derived and discussed. The raising and lowering operators are explicitly constructed and presented. Higher dimensional representations are developed by graphical as well as tensorial methods. Applications of the SU(7) Lie group to supersymmetric grand unification as well as applications are discussed.

scholarly journals Physical renormalization schemes and grand unification

2004 ◽  
Vol 69 (9) ◽  
Author(s):  
Michael Binger ◽  
Stanley J. Brodsky
Keyword(s):  
Grand Unification
Sign in / Sign up

Export Citation Format

Share Document