Updated: Higgs Mass Bounds Separate Models of Electroweak Symmetry Breaking

Abstract

Vacuum stability and metastability imply lower limits on the mass of the higgs boson in the Standard Model (SM). In contrast, we present an improved calculation of an upper limit on the lightest higgs mass in supersymmetric (susy) models, by summing to all orders in perturbation theory the leading and next--to--leading logarithms with a renormalization group equation technique, and by including finite two-loop QCD corrections.The improvement lowers the Minimal Susy Standard Model (MSSM) upper limit by about 10 GeV. The main uncertainty in each limit is the value of the top mass, which is now constrained by the Fermilab results. We study the possibility that these bounds do not overlap, and find that (i) a mass gap emerges between the SM and the MSSM at $m_t\sim 175$ GeV for ${\alpha }_s(M_Z^2)=0.118$ and at $m_t\sim 180$ GeV for more generous values $\sim (0.130)$ of ${\alpha }_s$; and between the SM and the Minimal plus Singlet Susy Model [(M+1)SSM] if the independent scalar self--coupling of the latter is perturbatively small or if the $\tan \beta$ parameter is large; these gaps widen with increasing $m_t$; (ii) the mass gap emerges with $m_t$ 10 GeV lighter if only vacuum stability and not metastability is imposed; (iii) there is no overlap between the SM and the MSSM bounds at even smaller values of $m_t$ for the $\tan \beta$ value ($\sim 1$--2) preferred in Supersymmetric Grand Unified Theories. Thus, a measurement of the first higgs mass will serve to exclude either the MSSM/(M+1)SSM higgs sectors or the SM higgs sector. Finally, we comment on the discovery potential for the lightest higgses in these models.

21 pages, latex, 4 postscript figures

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• Observation of the Top Quark
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• The Higgs Mass as the Discriminator of Electroweak Models
• The Higgs Boson Mass from Precision Electroweak Data
• Mass Bounds in the Standard Model
• Tevatron and LEP-II Probes of Minimal and String-Motivated Supergravity Models
• A Supersymmetric Effective Chiral Lagrangian
• Exploring the Yukawa Unified Minimal Supergravity Model at the Tevatron, LEP-II, and the LHC
• Searching for the Higgs Boson(s)

Cited by in corpus (15)

• The Next-to-Minimal Supersymmetric Standard Model
• Minimal Supergravity with R-Parity Breaking
• The coupling of the lightest SUSY Higgs boson to two photons in the decoupling regime
• Charged Higgs Boson and Stau Phenomenology in the Simplest R-Parity Breaking Model
• Implementation of the Multiple Point Principle in the Two-Higgs Doublet Model of type II
• Infrared quasi-fixed solutions in the NMSSM
• Particle spectrum in the modified NMSSM in the strong Yukawa coupling limit
• Invisible Higgs Decays to Hooperons in the NMSSM
• Higgs bosons in the simplest SUSY models
• Quasi-fixed point scenario in the modified NMSSM
• Cosmological constant in SUGRA models with Planck scale SUSY breaking and degenerate vacua
• Higgs Boson Mass From Orbifold GUTs
• Renormalization of the soft SUSY breaking terms in the strong Yukawa coupling limit in the NMSSM
• On the origin of approximate custodial symmetry in the Two-Higgs Doublet Model
• Majorana dark matter through the Higgs portal under the vacuum stability lamppost