Probing the symmetry-breaking pattern using sfermion masses

Abstract

We study the mass spectrum of superparticles within supersymmetric grand unified models. For gaugino masses, it is pointed out that the GUT-relation in the SU(5) model is applicable to a more general case where a grand-unified gauge group breaks down to the standard model gauge group by several steps. We also show that the mass spectrum of squarks and sleptons carries the information on the breaking pattern of the gauge symmetry. It is demonstrated in some SO(10) models how the scalar mass spectrum distinguishes various SO(10) breaking patterns from each other.

The soft supersymmetry-breaking Lagrangian: theory and applications

“…This has been studied within supersymmetric GUT frameworks such as SO (10) and PatiSalam SU(4) × SU(2) R × SU(2) L [166,158,167,168,169]. For example, within the Pati-Salam model the D term corrections must be included because they leave an imprint in the scalar masses of the charges carried by the broken GUT generator (these charges determine the coefficients of the g 2 terms above).…”

Viable t-b-τ Yukawa unification in SUSY SO(10)

“…In GUT models, even with universal boundary conditions at the Planck scale, the renormalization group (RG) running to the GUT scale generically leads to some non-universality of the scalar masses at that scale [8], [12]. In addition, in models like SO (10), the reduction of the rank of the gauge group by one at M GU T , together with non-universal scalar masses, generates additional non-universal contributions given by the D-term of the broken U(1) [13], [9].…”

Orbifold family unification

“…In general, there appear D-term contributions to scalar masses in SUSY models after the breakdown of such extra gauge symmetries [21][22][23]. The D-term contribution concerning family symmetry spoils the degeneracy of sfermion masses and can induce large flavor changing neutral current (FCNC) processes that are incompatible with experimental data.…”