Conformal Barrier and Hidden Local Symmetry Constraints: Walking Technirhos in LHC Diboson Channels

Abstract

We expand the previous analyses of the conformal barrier on the walking technirho for the 2 TeV diboson excesses reported by the ATLAS collaboration, with a special emphasis on the hidden local symmetry (HLS) constraints. We first show that the Standard Model (SM) Higgs Lagrangian is equivalent to the scale-invariant nonlinear chiral Lagrangian, which is further gauge equivalent to the scale-invariant HLS model, with the scale symmetry realized nonlinearly via SM Higgs as a (pseudo-) dilaton. The scale symmetry forbids the new vector boson decay to the 125 GeV Higgs plus W/Z boson, in sharp contrast to the conventional "equivalence theorem" which is invalidated by the conformality. The HLS forbids mixing between the iso-triplet technirho's, rho_{Pi} and rho_{P}, of the one-family walking technicolor (with four doublets N_D=N_F/2=4), which, without the HLS, would be generated when switching on the standard model gauging. We also present updated analyses of the walking technrho's for the diboson excesses by fully incorporating the constraints from the conformal barrier and the HLS as well as possible higher order effects: still characteristic of the one-family walking technirho is its smallness of the decay width, roughly of order Gamma/M_rho ~ [3/N_C x 1/N_D] x [Gamma/M_rho]_{QCD} ~ 70 GeV/2TeV (N_D= N_C=4), in perfect agreement with the expected diboson resonance with Gamma<100 GeV. The model is so sharply distinguishable from other massive spin 1 models without the conformality and HLS that it is clearly testable at the LHC Run II. If the 2 TeV boson decay to WH/ZH is not observed in the ongoing Run II, then the conformality is operative on the 125 GeV Higgs, strongly suggesting that the 2 TeV excess events are responsible for the walking technirhos and the 125 GeV Higgs is the technidilaton.

latex, 12 eps figures, 36 pages; minor corrections made in theory part, version published in NPB

References in corpus (11)

• 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
• FeynRules - Feynman rules made easy
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory
• Search for resonant diboson production in the $\ell \ell q\bar{q}$ final state in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for new resonances decaying via WZ to leptons in proton-proton collisions at sqrt(s) = 8 TeV
• Walking techni-pions at LHC
• Discovering walking technirho mesons at the LHC

Cited by in corpus (13)

• Scale-Invariant Hidden Local Symmetry, Topology Change and Dense Baryonic Matter II
• 750 GeV Diphoton Signal from One-Family Walking Technipion
• Simultaneous interpretation of $K$ and $B$ anomalies in terms of chiral-flavorful vectors
• Hidden Local Symmetry and Beyond
• Combination of Run-1 Exotic Searches in Diboson Final States at the LHC
• Alternative search strategies for a BSM resonance fitting ATLAS diboson excess
• Walking from 750 GeV to 950 GeV in the Technipion Zoo
• Fractionized Skyrmions in Dense Compact-Star Matter
• In Search of a Pristine Signal for (Scale-)Chiral Symmetry in Nuclei
• Old Wine in a New Bottle: Technidilaton as the 125 GeV Higgs -- Dedicated to the late Professor Yoichiro Nambu
• Diboson resonances within a custodially protected warped extra-dimensional scenario
• Angular observables for spin discrimination in boosted diboson final states
• Origin of Mass - Horizons Expanding from the Nambu's Theory