On dilatons and the LHC diphoton excess

Abstract

We study soft wall models that can embed the Standard Model and a naturally light dilaton. Exploiting the full capabilities of these models we identify the parameter space that allows to pass Electroweak Precision Tests with a moderate Kaluza-Klein scale, around $2$ TeV. We analyze the coupling of the dilaton with Standard Model (SM) fields in the bulk, and discuss two applications: i) Models with a light dilaton as the first particle beyond the SM pass quite easily all observational tests even with a dilaton lighter than the Higgs. However the possibility of a 125 GeV dilaton as a Higgs impostor is essentially disfavored; ii) We show how to extend the soft wall models to realize a 750 GeV dilaton that could explain the recently reported diphoton excess at the LHC.

36 pages, 11 figures; v2 references added

References in corpus (11)

• What is the gamma gamma resonance at 750 GeV?
• Radion Phenomenology in Realistic Warped Space Models
• A Light Dilaton in Walking Gauge Theories
• Di-photon resonance around 750 GeV: shedding light on the theory underneath
• A Boost Test of Anomalous Diphoton Resonance at the LHC
• Baryogenesis from Strong CP Violation and the QCD Axion
• Implications of the absence of high-mass radion signals
• Phenomenology of a light scalar: the dilaton
• A Very Light Dilaton
• Gravity localization and mass hierarchy in scalar-tensor branes
• A Soft-Wall Dilaton

Cited by in corpus (27)

• Quark Seesaw, Vectorlike Fermions and Diphoton Excess
• A Natural origin for the LHCb anomalies
• Higgs Stability and the 750 GeV Diphoton Excess
• Scalar Explanation of Diphoton Excess at LHC
• 750 GeV Diphoton Resonance, 125 GeV Higgs and Muon g-2 Anomaly in Deflected Anomaly Mediation SUSY Breaking Scenario
• Radion Candidate for the LHC Diphoton Resonance
• Electroweak Vacuum Stability and Diphoton Excess at 750 GeV
• Diphoton excess at 750 GeV: Singlet scalars confront triviality
• 750 GeV Diphoton Resonance from Singlets in an Exceptional Supersymmetric Standard Model
• Perturbativity, vacuum stability and inflation in the light of 750 GeV diphoton excess
• LHC 750 GeV Diphoton excess in a radiative seesaw model
• Diphoton Excess at 750 GeV in leptophobic U(1)${}^{\prime }$ model inspired by $E_6$ GUT
• 750 GeV Diphoton excess from $E_6$ in F-theory GUTs
• A Promising Interpretation of Diphoton Resonance at 750 GeV
• 750 GeV Resonance in the Gauged $U(1{)}^{\prime }$-Extended MSSM
• Studying 750 GeV Di-photon Resonance at Photon-Photon Collider
• 750 GeV Di-photon excess at CERN LHC from a dark sector assisted scalar decay
• Interpreting The 750 GeV Diphoton Excess Within Topflavor Seesaw Model
• Diphoton excess at 750 GeV and LHC constraints in models with vector-like particles
• Diphoton Excess and Running Couplings
• Models of LHC Diphoton Excesses Valid up to the Planck scale
• Di-Photon excess in the 2HDM: hasting towards the instability and the non-perturbative regime
• Systematic Study of Diphoton Resonance at 750 GeV from Sgoldstino
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• Can the 750 GeV diphoton LHC excess be due to a radion-dominated state?
• Minimal Dilaton Model and the Diphoton Excess