A Natural SUSY Higgs Near 126 GeV

Dec, 2011
24 pages
Published in:
  • JHEP 04 (2012) 131
e-Print:
Report number:
  • UCB-PTH-11-11

Citations per year

20112015201920232025050100150
Abstract: (arXiv)
The naturalness of a Higgs boson with a mass near 125 GeV is explored in a variety of weak-scale supersymmetric models. A Higgs mass of this size strongly points towards a non-minimal implementation of supersymmetry. The Minimal Supersymmetric Standard Model now requires large A-terms to avoid multi-TeV stops. The fine-tuning is at least 1% for low messenger scales, and an order of magnitude worse for high messenger scales. Naturalness is significantly improved in theories with a singlet superfield S coupled to the Higgs superfields via \lambda\ S H_u H_d. If \lambda\ is perturbative up to unified scales, a fine-tuning of about 10% is possible with a low mediation scale. Larger values of \lambda, implying new strong interactions below unified scales, allow for a highly natural 125 GeV Higgs boson over a wide range of parameters. Even for \lambda\ as large as 2, where a heavier Higgs might be expected, a light Higgs boson naturally results from singlet-doublet scalar mixing. Although the Higgs is light, naturalness allows for stops as heavy as 1.5 TeV and a gluino as heavy as 3 TeV. Non-decoupling effects among the Higgs doublets can significantly suppress the coupling of the light Higgs to b quarks in theories with a large \lambda, enhancing the \gamma \gamma\ and WW signal rates at the LHC by an order one factor relative to the Standard Model Higgs.
Note:
  • 25 pages, 14 figures; v2: updated figures and references
  • scale: messenger
  • superfield: Higgs
  • scale: electroweak interaction
  • Higgs particle: mass
  • stop
  • supersymmetry
  • minimal supersymmetric standard model
  • gluino