Grand unification, axion, and inflation in Intermediate Scale Supersymmetry

Abstract

A class of supersymmetric grand unified theories is introduced that has a single scale below the cutoff, that of the supersymmetry breaking massesm. For a wide range of the dimensionless parameters, agreement with the observed mass of the Higgs boson determinesm ∼ 10 9 -10 13 GeV, yielding Intermediate Scale Supersymmetry. We show that within this framework it is possible for seesaw neutrino masses, axions, and inflation to be described by the scalem, offering the possibility of a unified origin of disparate phenomena. Neutrino masses allowing for thermal leptogenesis can be obtained, and the axion decay constant lies naturally in the range f a ∼ 10 9 -10 11 GeV, consistent with a recent observational suggestion of high scale inflation. A minimal SU(5) model is presented that illustrates these features. In this model, the only states at the grand unified scale are those of the heavy gauge supermultiplet. The grand unified partners of the Higgs doublets have a mass of orderm, leading to the dominant proton decay mode p →νK + , which may be probed in upcoming experiments. Dark matter may be winos, with mass environmentally selected to the TeV scale, and/or axions. Gauge coupling unification is found to be successful, especially if the wino is at the TeV scale.

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

“…It is a prototype of more complicated models, and it can reproduce their low energy phenomenology to a remarkable accuracy. For example it effectively reproduces more complete unified models like [34], as well as a Supersymmetric spectrum in which a pure Wino is the lightest EW superpartner, a possibility that recently attracted lot of attention in different models of SUSY at higher scales [33,[36][37][38][39][40][41][42]. Here it is important to stress that the value of the mass splitting M χ ± − M χ 0 , which is crucial for the phenomenology we will discuss, is robust against corrections from possible UV models.…”

“…Moreover, it does not introduce large radiative corrections to the Higgs mass, and it helps to achieve the unification of the gauge couplings. This particle emerges also in more general scenarios, like SUSY models [33,[36][37][38][39][40][41][42], GUT constructions [34], and also in other contexts [87,88].…”

Prospects and blind spots for neutralino dark matter

“…As before, Fermi is currently unable to constrain thermal dark matter, which has a smaller annihilation cross-section. For prior applications of Fermi limits to non-thermal wino DM, see for example [65,66,67].…”

Enhanced Higgs mass in a gaugino mediation model without the Polonyi problem

“…(A similar model was proposed in Ref. [5].) The scenario can naturally explain the Higgs mass of around 125 GeV with heavy stops [6].…”

“…5 The change of these beta-functions dramatically alters the squark masses and trilinear couplings at the SUSY scale. In particular, the changes of the stop masses and stop trilinear coupling lead to the important consequences in the Higgs boson mass and the SUSY search at the LHC.…”