Exploring high-mass diphoton resonance without new colored states

Abstract

A new heavy resonance may be observable at the LHC if it has a significant decay branching fraction into a pair of photons. We entertain this possibility by looking at the modest excess in the diphoton invariant mass spectrum around 750 GeV recently reported in the ATLAS and CMS experiments. Assuming that it is a spinless boson, dubbed $\tilde{s}$, we consider it within a model containing two weak scalar doublets having zero vacuum expectation values and a scalar singlet in addition to the doublet responsible for breaking the electroweak symmetry. The model also possesses three Dirac neutral singlet fermions, the lightest one of which can play the role of dark matter and which participate with the new doublet scalars in generating light neutrino masses radiatively. We show that the model is consistent with all phenomenological constraints and can yield a production cross section $\sigma (pp\to \tilde{s}\to \gamma \gamma )$ of roughly the desired size, mainly via the photon-fusion contribution, without involving extra colored fermions or bosons. We also discuss other major decay modes of $\tilde{s}$ which are potentially testable in upcoming LHC measurements.

29 pages, 6 figures, retitled, expanded to address dark matter & neutrino mass, matches journal version

References in corpus (54)

• Big-Bang Nucleosynthesis
• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• The oblique parameters in multi-Higgs-doublet models
• Composite Models for the 750 GeV Diphoton Excess
• Search for Scalar Diphoton Resonances in the Mass Range $65-600$ GeV with the ATLAS Detector in $pp$ Collision Data at $\sqrt{s}$ = 8 $TeV$
• The Minimal Model of a Diphoton Resonance: Production without Gluon Couplings
• Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider
• Di-photon resonance around 750 GeV: shedding light on the theory underneath
• Quark Seesaw, Vectorlike Fermions and Diphoton Excess
• Tricking Landau-Yang: How to obtain the diphoton excess from a vector resonance
• The Minimal Scalar-Stealth Top Interpretation of the Diphoton Excess
• Search for the Lepton Flavour Violating Decay ${\mu }^{+}\to e^{+}\gamma$ with the Full Dataset of the MEG Experiment
• Implication of the 750 GeV diphoton resonance on two-Higgs-doublet model and its extensions with Higgs field
• A SUSY Inspired Simplified Model for the 750 GeV Diphoton Excess
• Interpreting $750$ GeV Diphoton Excess with R-parity Violating Supersymmetry
• Higgs Stability and the 750 GeV Diphoton Excess
• Radion Candidate for the LHC Diphoton Resonance
• The LHC 750 GeV diphoton excess in supersymmetry with gauged baryon and lepton numbers
• LHC diphotons from electroweakly pair-produced composite pseudoscalars
• LHC diphoton 750 GeV resonance as an indication of $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ gauge symmetry
• 750 GeV diphotons from closed string states
• LHC diphoton excess from colorful resonances
• Strong CP Problem, Neutrino Masses and the 750 GeV Diphoton Resonance
• Four-loop Neutrino Model Inspired by Diphoton Excess at 750 GeV
• An extension of two-Higgs-doublet model and the excesses of 750 GeV diphoton, muon g-2 and $h\to \mu \tau$
• Explaining 750 GeV diphoton excess from top/bottom partner cascade decay in two-Higgs-doublet model extension
• The Diphoton Excess from an Exceptional Supersymmetric Standard Model
• 750 GeV Composite Axion as the LHC Diphoton Resonance
• Broad Diphotons from Narrow States
• Dark Matter Theories in the Light of Diphoton Excess
• Is an axizilla possible for di-photon resonance?
• Diphoton excess at 750 GeV in an extended scalar sector
• Diphoton Excess in Consistent Supersymmetric SU(5) Models with Vector-like Particles
• Probing degenerate heavy Higgs bosons in NMSSM with vector-like particles
• The $750\text{GeV}$ diphoton resonance in the light of a 2HDM with $S_3$ flavour symmetry
• The Diphoton Excess Inspired Electroweak Baryogenesis
• New results at LHC confirming the vacuum stability and Multiple Point Principle
• Diphoton Revelation of the Utilitarian Supersymmetric Standard Model
• Hypercharge Axion and the Diphoton $750$ GeV Resonance
• Semi-elastic cross section for a scalar resonance of mass 750 GeV
• Pseudoscalar Gluinonia to 750 GeV LHC Diphotons
• The Significance of the 750 GeV Fluctuation in the ATLAS Run 2 Diphoton Data
• On Electroweak Phase Transition and Di-photon Excess with a 750 GeV Scalar Resonance
• Probing New Physics with Isotope Shift Spectroscopy
• The Fourth Generation Quark and the 750 GeV Diphoton Excess
• Advantages of exclusive γγproduction to probe high mass systems
• SU(2) x SU(2) x U(1) Interpretation on the 750 GeV Diphoton Excess
• Electroweak Symmetry Breaking and the Higgs Boson
• A Theory of Ambulance Chasing
• Extension of $\nu$MSM model and possible explanations of recent astronomical and collider observations
• Re-examining the significance of the 750 GeV diphoton excess at ATLAS
• Solving the Strong CP Problem with High-Colour Quarks and Composite Axion
• Oblique corrections from less-Higgsless models in warped space
• A see-saw scenario of an $A_4$ flavour symmetric standard model

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