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
with V. Barger, P. Langacker, M. Ramsey-Musolf, and G. Shaughnessy
May 8th, 2007
Add one singlet to the Higgs potential
-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.)
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
Extended decays through singlet:
WH lv + 4b
WHlv + 2b + 2
Eboli and Zeppenfeld
Davoudiasl, Han, Logan
Higgs can be discoverable through visible or invisible modes with early LHC data.
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)
-Visible discovery modes weakened from HSS.
-Higgs may be discoverable through invisible modes.