Discovering Strong Top Dynamics at the LHC

Abstract

We analyze the phenomenology of the top-pion and top-Higgs states in models with strong top dynamics, and translate the present LHC searches for the Standard Model Higgs into bounds on these scalar states. We explore the possibility that the new state at a mass of approximately 125 GeV observed at the LHC is consistent with a neutral pseudoscalar top-pion state. We demonstrate that a neutral pseudoscalar top-pion can generate the diphoton signal at the observed rate. However, the region of model parameter space where this is the case does not correspond to classic topcolor-assisted technicolor scenarios with degenerate charged and neutral top-pions and a top-Higgs mass of order twice the top mass; rather, additional isospin violation would need to be present and the top dynamics would be more akin to that in top seesaw models. Moreover, the interpretation of the new state as a top-pion can be sustained only if the ZZ (four-lepton) and WW (two-lepton plus missing energy) signatures initially observed at the 3? level decline in significance as additional data is accrued.

25 pages, pdf embedded figures. Submission extensively revised to reflect discovery of a 125 GeV boson

References in corpus (14)

• 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
• Combined results of searches for the standard model Higgs boson in pp collisions at sqrt(s) = 7 TeV
• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
• Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector
• A Three Site Higgsless Model
• A New Custodian for a Realistic Higgsless Model
• Probing the scalar-pseudoscalar mixing in the 125 GeV Higgs particle with current data
• Can the 126 GeV boson be a pseudoscalar?
• Pseudoscalar Higgs Bosons at the LHC: Production and Decays into Electroweak Gauge Bosons Revisited
• Search for tb resonances in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The Top Triangle Moose: Combining Higgsless and Topcolor Mechanisms for Mass Generation
• Hypercharge-Universal Topcolor

Cited by in corpus (10)

• Higgs CP Properties From Early LHC Data
• The Nambu sum rule and the relation between the masses of composite Higgs bosons
• Probing $tt\gamma$ and $ttZ$ couplings at the LHeC
• A Flavorful Top-Coloron Model
• Precise photoproduction of the charged top-pions at the LHC with forward detector acceptances
• A Higgs Impostor in Low-Scale Technicolor
• Gauge theory of Lorentz group as a source of the dynamical electroweak symmetry breaking
• Rare baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in the TTM model
• Top-Mode Pseudos at the LHC
• 750 GeV diphoton excess confronted with a top-pion in the TTM model