The Light Stop Scenario from Gauge Mediation

Abstract

In this paper we embed the light stop scenario, a MSSM framework which explains the baryon asymmetry of the universe through a strong first order electroweak phase transition, in a top-down approach. The required low energy spectrum consists in the light SM-like Higgs, the right-handed stop, the gauginos and the Higgsinos while the remaining scalars are heavy. This spectrum is naturally driven by renormalization group evolution starting from a heavy scalar spectrum at high energies. The latter is obtained through a supersymmetry-breaking mix of gauge mediation, which provides the scalars masses by new gauge interactions, and gravity mediation, which generates gaugino and Higgsino masses. This supersymmetry breaking also explains the μ and B_μ parameters necessary for electroweak breaking and predicts small tri-linear mixing terms A_t in agreement with electroweak baryogenesis requirements. The minimal embedding predicts a Higgs mass around its experimental lower bound and by a small extension higher masses m_H\lesssim 127 GeV can be accommodated.

20 pages, 3 figures; v2: changes in the conventions; v3: more details on the Higgs mass prediction, version published in JHEP

References in corpus (4)

• The Baryogenesis Window in the MSSM
• The Effective Theory of the Light Stop Scenario
• The New Flavor of Higgsed Gauge Mediation
• The Least Supersymmetric Standard Model

Cited by in corpus (14)

• MSSM Electroweak Baryogenesis and LHC Data
• Excluding Electroweak Baryogenesis in the MSSM
• A Heavy SM-like Higgs and a Light Stop from Yukawa-Deflected Gauge Mediation
• Lattice study of an electroweak phase transition at m_h ~ 126 GeV
• Large diphoton Higgs rates from supersymmetric triplets
• On the Higgs Fit and Electroweak Phase Transition
• Natural gauge mediation with a bino NLSP at the LHC
• General Focus Point in the MSSM
• Electroweak vacuum stability and finite quadratic radiative corrections
• A light sneutrino rescues the light stop
• Light third-generation squarks from flavour gauge messengers
• A Light Supersymmetric Higgs Sector Hidden by a Standard Model-like Higgs
• Focus Point in the Light Stop Scenario
• Long-lived Colored Scalars at the LHC