Phenomenology of the singlet extended standard model
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Phenomenology of the Singlet Extended Standard Model. Mat McCaskey with V. Barger, P. Langacker, M. Ramsey-Musolf, and G. Shaughnessy. Pheno2007 May 8th, 2007. SM Higgs + Scalar Singlet. Add one singlet to the Higgs potential Higgs is indistinguishable from SM

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Phenomenology of the Singlet Extended Standard Model

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Phenomenology of the singlet extended standard model

Phenomenology of the Singlet Extended Standard Model

Mat McCaskey

with V. Barger, P. Langacker, M. Ramsey-Musolf, and G. Shaughnessy

Pheno2007

May 8th, 2007


Sm higgs scalar singlet

SM Higgs + Scalar Singlet

Add one singlet to the Higgs potential

  • Higgs is indistinguishable from SM

  • Singlet is shifted so it obtains no VEV

-Singlet only couples to the Higgs

Two specific cases to study

Case 1: Singlet couples to the Higgs (O’Connell et al.)

Case 2: Impose reflection symmetry (McDonald & Burgess et al.)


Case 1 higgs and singlet mixing

Case 1: Higgs and Singlet Mixing

Higgs BF same as SM

Exception: mH2> 2mH1 then H2  H1 H1 is open

Higgs coupling reduced universally by mixing parameter

BF of H1 same as SM Higgs of equal mass


Case 1 new higgs decay modes

Case 1: New Higgs decay modes

Extended decays through singlet:

WH lv + 4b

WHlv + 2b + 2


Case 1 new higgs decay modes1

Case 1: New Higgs decay modes


Case 2 reflection symmetry

Case 2: Reflection Symmetry

  • S-S symmetry prevents S decay

    • DM candidate

  • DM singlet annihilates through the Higgs boson via

Annihilation processes:


Case 2 higgs decay to singlet

Case 2: Higgs decay to singlet

  • Higgs decays to invisible states which reduces the rate of traditional modes.


Case 2 finding invisible higgs

Case 2: Finding invisible Higgs

  • Weak boson fusion:

    • Extract signal with cuts on azimuthal correlation of forward jets and large missing pT

  • Z-Higgstrahlung:

    • Cuts on di-lepton separation and invariant mass extract signal

    • Combined model independent Higgs mass determination.

Eboli and Zeppenfeld

Davoudiasl, Han, Logan


Case 2 relic density

Case 2: Relic Density

  • Numerically solved Boltzman equation (McDonald et al., Gondolo et al., Kolb and Turner)


Case 2 relic density1

Case 2: Relic Density

  • WMAP constrains the relic density to be between 0.099 < Sh2 < 0.123


Case 2 scattering cross section

Case 2: Scattering Cross Section

  • Direct detection of the dark matter candidate by elastic scattering off a nucleus.


Case 2 higgs discovery via stable s

Case 2: Higgs discovery via stable S

  • OPAL: Higgs w/SM couplings mh>82 GeV

  • ATLAS reach on BF(Hinv.) to ~ 20%

Higgs can be discoverable through visible or invisible modes with early LHC data.


Summary

Summary

SM + 1 scalar singlet:

Case 1: Singlet Mixes with SM Higgs

-Traditional discovery modes weakened if

H2  H1 H1 is open

-Higgs discovery may be possible with new decay modes through new modes.

Case 2: Reflection Symmetry (Stable S)

-DM Candidate

-Visible discovery modes weakened from HSS.

-Higgs may be discoverable through invisible modes.


Parameter scan ranges

Parameter Scan Ranges

Case 1

Case 2


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