Electroweak Baryogenesis and Higgs Properties

Cohen, Timothy ; /SLAC ; Morrissey, David E. ; /TRIUMF ; Pierce, Aaron ; /Michigan U., MCTP

SLAC National Accelerator Laboratory

关键词: Scalar Fields;    Gluons;    Standard Model Theory-Hep,Hepth;    Scalars;    72 Physics Of Elementary Particles And Fields;   

DOI  :  10.2172/1036491
RP-ID  :  SLAC-PUB-14889
RP-ID  :  AC02-76SF00515
RP-ID  :  1036491

美国|英语

来源: UNT Digital Library

【 摘 要 】

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){sub 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 {approx}< m{sub h} {approx}< 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.