Electroweak Baryogenesis and Higgs Properties

Technical Report · Tue Mar 13 00:00:00 EDT 2012

DOI:https://doi.org/10.2172/1036491· OSTI ID:1036491

Cohen, Timothy ^[1]; Morrissey, David E. ^[2]; Pierce, Aaron ^[3]

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1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
2. TRIUMF, Vancouver, BC (Canada)
3. Univ. of Michigan, Ann Arbor, MI (United States)

We explore the connection between the strength of the electroweak phase transition and the properties of the Higgs boson. Our interest is in regions of parameter space that can realize electroweak baryogenesis. We do so in a simplified framework in which a single Higgs field couples to new scalar fields charged under SU(3)_c by way of the Higgs portal. Such new scalars can make the electroweak phase transition more strongly first-order, while contributing to the effective Higgs boson couplings to gluons and photons through loop effects. For Higgs boson masses in the range 115 ~< m_h ~< 130 GeV, whenever the phase transition becomes strong enough for successful electroweak baryogenesis, we find that Higgs boson properties are modified by an amount observable by the LHC. We also discuss the baryogenesis window of the minimal supersymmetric standard model (MSSM), which appears to be under tension. Furthermore, we argue that the discovery of a Higgs boson with standard model-like couplings to gluons and photons will rule out electroweak baryogenesis in the MSSM.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1036491
• Report Number(s): SLAC-PUB--14889
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
GLUONS
HEPTH
HIGGS BOSONS
PHOTONS
SCALAR FIELDS
SCALARS
STANDARD MODEL
Theory-HEP