LHC Higgs Signatures from Topflavor Seesaw Mechanism

Abstract

We study LHC Higgs signatures from topflavor seesaw realization of electroweak symmetry breaking with a minimal gauge extension SU(2) x SU(2) x U(1). This elegant renormalizable construction singles out top quark sector (instead of all other light fermions) to join the new SU(2) gauge force. It predicts extra vector-like spectator quarks (T, B), new gauge bosons (W', Z'), and a pair of neutral Higgs bosons (h, H). We demonstrate that for the lighter Higgs boson h of mass 125GeV, this model predicts modified Higgs signal rates in h --> γγ, WW*, ZZ* channels via gluon fusions, in h --> tau tau mode via vector boson fusions, and in h --> bb mode via gauge boson associate productions. We perform a global fit for our theory by including both direct search data (LHC and Tevatron) and indirect precision constraints. We further analyze the LHC discovery potential for detecting the heavier Higgs state H.

PLB published version. Only minor refinements, typos corrected, references added

References in corpus (7)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• A Three Site Higgsless Model
• LHC Signatures of New Gauge Bosons in the Minimal Higgsless Model
• LHC Higgs Signatures from Extended Electroweak Gauge Symmetry
• LHC Signatures of Two-Higgs-Doublets with Fourth Family
• LHC phenomenology of general SU(2)xSU(2)xU(1) models

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