Investigation of no-scale supersymmetry breaking models with a gaugedU(1)B−Lsymmetry

Abstract

Noscale supersymmetry (SUSY) breaking model is investigated in the minimal extension of the minimal supersymmetric standard model (MSSM) with a gauged U(1) B−L symmetry. We specifically consider a unification-inspired model with the gauge groups SU(3) C ×SU(2) L ×U(1) Y ×U(1) B−L ⊂SU(5)× U(1) 5 for illustration. While the noscale boundary condition at the grand unification scale (M G ≃ 2 × 10 16 GeV) in the MSSM is not consistent with phenomenological constraints, we show that it is if the gaugino of the U(1) 5 multiplet is several times heavier than the gauginos of the MSSM. However, if SU(5)×U(1) 5 is further embedded in a larger simple group, e.g. SO(10), the noscale boundary condition at M G is inconsistent with phenomenological constraints. If we relax the noscale boundary condition and allow non-zero soft scalar masses for the Higgs fields which spontaneously break the U(1) 5 symmetry, the resultant spectrum of SUSY particles becomes consistent with all the phenomenological constraints, even if we impose the GUT relation on the gauge coupling and the gaugino mass of the U(1) 5 . In this case, the SUSY CP problem is also solved, since the condition Bµ = 0 at the boundary can be imposed consistently with the electroweak symmetry breaking.

Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope

“…For an example, several stringtheory motivated frameworks predict that the generic decay of moduli produce Standard Model particles along with their supersymmetric partners, and those supersymmetric partners will eventually decay into the lightest neutralinos [51]. Apart from that, decay of topological objects such as Q-balls may produce neutralinos out of equilibrium [52]. A scenario that predicts the presence of a dynamical "quintessence" field in a kinematic-dominated phase [53,54] also supports such non-thermal production of WIMPs.…”

Gravitational wave signals from short-lived topological defects in the MSSM

“…If λ in Eq. 6 In such cases, the potential for the flat direction may be dominated by higher dimensional terms coming from nonrenormalizable Kähler potential [27]. The induced potential is proportional to H 2 like the Hubble induced mass term described above.…”

Decaying hidden gaugino as a source of PAMELA/ATIC anomalies

“…For instance, if the gauge symmetry in the bulk is identified with a U(1) 5 , so-called "fiveness" [31], the hidden gaugino is coupled to the higgs and higgsino, in addition to lepton + slepton and quark + squark. However, if the higgsino mass is heavier than m, the hidden gaugino still mainly decays into lepton + slepton, thereby keeping the suppression of the antiproton production.…”