Seesaw Extended MSSM and Anomaly Mediation without Tachyonic Sleptons

Abstract

Superconformal anomalies provide an elegant and economical way to understand the soft breaking parameters in SUSY models; however, implementing them leads to the several undesirable features including: tachyonic sleptons and electroweak symmetry breaking problems in both the MSSM and the NMSSM. Since these two theories also have the additonal problem of massless neutrinos, we have reconsidered the AMSB problems in a class of models that extends the NMSSM to explain small neutrino masses via the seesaw mechanism. In a recent paper, we showed that for a class of minimal left-right extensions, a built-in mechanism exists which naturally solves the tachyonic slepton problem and provides new alternatives to the MSSM that also have automatic R-parity conservation. In this paper, we discuss how electroweak symmetry breaking arises in this model through an NMSSM-like low energy theory with a singlet VEV, induced by the structure of the left-right extension and of the right magnitude. We then study the phenomenological issues and find: the LSP is an Higgsino-wino mix, new phenomenology for chargino decays to the LSP, degenerate same generation sleptons and a potential for a mild squark-slepton degeneracy. We also discuss possible collider signatures and the feasibility of dark matter in this model.

40 pages, 10 figures, 5 tables; v3: Added addendum and three new references; v4: Added reference that was inadvertently omitted

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Cited by in corpus (12)

• The Next-to-Minimal Supersymmetric Standard Model
• The Fate of R-Parity
• Triplet Extended Supersymmetric Standard Model
• $\nu$-GMSB with Type III Seesaw and Phenomenology
• Constraining Right-Handed Scale Through Kaon Mixing in SUSY Left-Right Model
• B-L assisted Anomaly Mediation and the radiative B-L symmetry breaking
• D-term assisted Anomaly Mediation in E6 motivated models
• Flavorful hybrid anomaly-gravity mediation
• Inflation and type III seesaw mechanism in $\nu$-gauge mediated supersymmetry breaking
• When Anomaly Mediation is UV Sensitive
• Splitting the Wino Multiplet by Higher-Dimensional Operators in Anomaly Mediation
• Top-down and bottom-up excursions beyond the Standard Model: The example of left-right symmetries in supersymmetry