Extra vector-like matter and the lightest Higgs scalar boson mass in low-energy supersymmetry

Journal Article · Thu Oct 01 00:00:00 EDT 2009 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.81.035004· OSTI ID:3019616

Martin, Stephen P. ^[1]

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1. Northern Illinois U.; Fermilab

The lightest Higgs scalar boson mass in supersymmetry can be raised significantly by extra vector-like quark and lepton supermultiplets with large Yukawa couplings but dominantly electroweak-singlet masses. I consider models of this type that maintain perturbative gauge coupling unification. The impact of the new particles on precision electroweak observables is found to be moderate, with the fit to Z-pole data as good or better than that of the Standard Model even if the new Yukawa couplings are as large as their fixed-point values and the extra vector-like quark masses are as light as 400 GeV. I study the size of corrections to the lightest Higgs boson mass, taking into account the fixed-point behavior of the scalar trilinear couplings. I also discuss the decay branchings ratios of the lightest new quarks and leptons and general features of the resulting collider signatures.

• Research Organization: Northern Illinois U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 3019616
• Report Number(s): FERMILAB-PUB-09-852-T; oai:inspirehep.net:834049; arXiv:0910.2732
• Journal Information: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 81
• Country of Publication: United States
• Language: English