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

scholarly journals UPPER BOUND ON THE SCALE OF MAJORANA-NEUTRINO MASS GENERATION

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 709-711 ◽  
Author(s):  
J. M. NICZYPORUK
Keyword(s):  
Neutrino Mass ◽  
Upper Bound ◽  
Planck Scale ◽  
Majorana Neutrino ◽  
Grand Unification ◽  
Neutrino Masses ◽  
Mass Generation ◽  
Model Independent ◽  
Neutrino Mass Generation ◽  
Majorana Neutrino Mass

We derive a model-independent upper bound on the scale of Majorana-neutrino mass generation. The upper bound is [Formula: see text], where v ≃246 GeV is the weak scale and mν is the Majorana-neutrino mass. For neutrino masses implied by neutrino oscillation experiments, all but one of these bounds are less than the Planck scale, and they are all within a few orders of magnitude of the grand-unification scale.

scholarly journals Proton lifetime upper bound in non-SUSY SU(5) GUT

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
Naoyuki Haba ◽  
Yukihiro Mimura ◽  
Toshifumi Yamada
Keyword(s):  
Upper Bound ◽  
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.

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