Strictly Anomaly Mediated Supersymmetry Breaking

Abstract

We consider an MSSM extension with anomaly mediation as the source of supersymmetry-breaking, and a U(1) symmetry which solves the tachyonic slepton problem, and introduces both the see-saw mechanism for neutrino masses, and the Higgs mu-term. We compare its spectra with those from so-called minimal anomaly mediated supersymmetry breaking. We find a Standard Model-like Higgs of mass 125 GeV with a gravitino mass of 140 TeV and tan(beta)=16. However, the muon anomalous magnetic moment is 3 sigma away from the experimental value. The model naturally produces a period of hybrid inflation, which can exit to a false vacuum characterised by large Higgs vevs, reaching the true ground state after a period of thermal inflation. The scalar spectral index is reduced to approximately 0.975, and the correct abundance of neutralino dark matter can be produced by decays of thermally-produced gravitinos, provided the gravitino mass (and hence the Higgs mass) is high. Naturally light cosmic strings are produced, satisfying bounds from the Cosmic Microwave Background. The complementary pulsar timing and cosmic ray bounds require that strings decay primarily via loops into gravitational waves. Unless the loops are extremely small, the next generation pulsar timing array will rule out or detect the string-derived gravitational radiation background in this model.

38 pages, 1 figure. Discussion of 125GeV Higgs possibility, and of U(1) decoupling limit

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Cited by in corpus (8)

• Particle Spectroscopy of Supersymmetric SU(5) in Light of 125 GeV Higgs and Muon g-2 Data
• Type I Abelian Higgs strings: evolution and Cosmic Microwave Background constraints
• Anomaly mediated SUSY breaking model retrofitted for naturalness
• Cosmological and astrophysical constraints on superconducting cosmic strings
• Positively deflected anomaly mediation in the light of the Higgs boson discovery
• Peccei-Quinn Symmetric Pure Gravity Mediation
• Consistent cosmology with Higgs thermal inflation in a minimal extension of the MSSM
• GUT-scale inflation with sizeable tensor modes