How Resonance-Continuum Interference Changes 750 GeV Diphoton Excess: Signal Enhancement and Peak Shift

Abstract

The new scalar resonance contribution to the 750 GeV diphoton excess observed at the LHC 13 TeV necessarily interferes with the continuum background in the $gg\to \gamma \gamma$. The interference has two considerable effects: (1) enhancing or suppressing diphoton signal rate due to the imaginary-part interference and (2) distorting resonance shape due to the real-part interference. From the best-fit study of two benchmark models (two Higgs doublets with $\sim$50 GeV widths and a singlet scalar with 5 GeV width, both extended with vector-like fermions), we find that the resonance contribution to the 750 GeV excess can be enhanced by a factor of 2(1.6) for 3(6) fb signal rate and the 68%(95%) CL best-fit mass range can shift by 1-4 (any $\mathcal{O}$(1)) GeV. If the best-fit excess rate decreases with future data, the interference effects will become more significant. The inevitable interferences can also provide a consistency check of a resonance hypothesis, whether or not future precision shape measurements confirm a Breit-Wigner shape or discover interesting deviations.

23 pages, 14 figures

References in corpus (80)

• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• Vector boson pair production at the LHC
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• What is the gamma gamma resonance at 750 GeV?
• Phenomenology of a 750 GeV Singlet
• Composite Models for the 750 GeV Diphoton Excess
• Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons
• On the Interpretation of a Possible $\sim 750$ GeV Particle Decaying into $\gamma \gamma$
• Rays of light from the LHC
• Search for neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• The QCD Axion from Aligned Axions and Diphoton Excess
• Scattering Light by Light at 750 GeV at the LHC
• The Minimal Model of a Diphoton Resonance: Production without Gluon Couplings
• A pseudoscalar decaying to photon pairs in the early LHC Run 2 data
• Footprints of New Strong Dynamics via Anomaly and the 750 GeV Diphoton
• Singlet Scalar Resonances and the Diphoton Excess
• First interpretation of the 750 GeV di-photon resonance at the LHC
• Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider
• The diphoton resonance as a gravity mediator of dark matter
• Knocking on New Physics' door with a Scalar Resonance
• The 750 GeV diphoton excess from the goldstino superpartner
• A 750 GeV Dark Pion: Cousin of a Dark G-parity-odd WIMP
• Di-photon resonance around 750 GeV: shedding light on the theory underneath
• Quark Seesaw, Vectorlike Fermions and Diphoton Excess
• Can the new resonance at LHC be a CP-Odd Higgs boson?
• Tricking Landau-Yang: How to obtain the diphoton excess from a vector resonance
• The Minimal Scalar-Stealth Top Interpretation of the Diphoton Excess
• Quirky Explanations for the Diphoton Excess
• A hidden confining world on the 750 GeV diphoton excess
• A Boost Test of Anomalous Diphoton Resonance at the LHC
• The 750 GeV $S$-cion: Where else should we look for it?
• Interpretation of the diphoton excess at CMS and ATLAS
• Higgs singlet boson as a diphoton resonance in a vector-like quark model
• Vector Leptoquarks and the 750 GeV Diphoton Resonance at the LHC
• See-Saw Composite Higgses at the LHC: Linking Naturalness to the $750$ GeV Di-Photon Resonance
• Implication of the 750 GeV diphoton resonance on two-Higgs-doublet model and its extensions with Higgs field
• 750 GeV Diphotons from a D3-brane
• A resonance without resonance: scrutinizing the diphoton excess at 750 GeV
• A SUSY Inspired Simplified Model for the 750 GeV Diphoton Excess
• Interpreting the 750 GeV diphoton excess by the singlet extension of the Manohar-Wise Model
• On the 750 GeV di-photon excess
• Interpreting the 750 GeV Di-photon Resonance using photon-jets in Hidden-Valley-like models
• Flavor Anomalies, the Diphoton Excess and a Dark Matter Candidate
• On sgoldstino interpretation of the diphoton excess
• The 750 GeV Diphoton Excess May Not Imply a 750 GeV Resonance
• 750 GeV Resonance in the Dark Left-Right Model
• Gauged Two Higgs Doublet Model confronts the LHC 750 GeV di-photon anomaly
• Could the width of the diphoton anomaly signal a three-body decay ?
• Symmetries Behind the 750 GeV Diphoton Excess
• The 750 GeV diphoton excess at the LHC and dark matter constraints
• Scalar Explanation of Diphoton Excess at LHC
• Higgs Stability and the 750 GeV Diphoton Excess
• 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
• New vector bosons and the diphoton excess
• Model-independent combination of diphoton constraints at 750 GeV
• The LHC diphoton resonance from gauge symmetry
• The LHC 750 GeV diphoton excess in supersymmetry with gauged baryon and lepton numbers
• Di-photon Excess Explained by a Resonant Sneutrino in R-parity Violating Supersymmetry
• LHC diphoton 750 GeV resonance as an indication of $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ gauge symmetry
• LHC diphotons from electroweakly pair-produced composite pseudoscalars
• 750 GeV diphoton resonance in a top and bottom seesaw model
• Interpreting 750 GeV diphoton excess in SU(5) grand unified theory
• Goldstones in Diphotons
• Diphoton excess at 750 GeV: Singlet scalars confront triviality
• Squarkonium, diquarkonium and octetonium at the LHC and their di-photon decays
• The 750 GeV diphoton excess and its explanation in 2-Higgs Doublet Models with a real inert scalar multiplet
• Diphoton resonance at 750 GeV in the broken MRSSM
• LHC diphoton excess from colorful resonances
• Supersoft SUSY Models and the 750 GeV Diphoton Excess, Beyond Effective Operators
• Perturbativity, vacuum stability and inflation in the light of 750 GeV diphoton excess
• 750 GeV Diphotons: Implications for Supersymmetric Unification
• A natural Coleman-Weinberg theory explains the diphoton excess
• The 750 GeV diphoton resonance as a singlet scalar in an extra dimensional model
• 750 GeV Diphotons: Implications for Supersymmetric Unification II
• Higgs precision study of the 750 GeV diphoton resonance and the 125 GeV standard model Higgs boson with Higgs-singlet mixing
• Top-phobic heavy Higgs boson as the 750 GeV diphoton resonance
• Fully covering the MSSM Higgs sector at the LHC
• Interference effects in the $H(\to \gamma \gamma )+2$ jets channel at the LHC
• String Consistency, Heavy Exotics, and the 750 GeV Diphoton Excess at the LHC: Addendum

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• Measuring the diphoton coupling of a 750 GeV resonance
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• Digamma, what next?
• Interpreting the 750 GeV digamma excess: a review
• 750 GeV Di-photon excess at CERN LHC from a dark sector assisted scalar decay
• Confronting a New Three-loop Seesaw Model with the 750 GeV Diphoton Excess
• Interference Effects in $t\bar{t}$ Production at the LHC as a Window on New Physics
• Diphoton Excess and Running Couplings
• Models of LHC Diphoton Excesses Valid up to the Planck scale
• Interference Effects in the Decays of Spin-Zero Resonances into $\gamma \gamma$ and $t\bar{t}$
• Note on Spin-2 Particle Interpretation of the 750~GeV Diphoton Excess
• Diphotons from Diaxions
• Interpreting 750 GeV Diphoton Excess in Plain NMSSM
• Systematic Study of Diphoton Resonance at 750 GeV from Sgoldstino
• Precise top-quark mass from the diphoton mass spectrum
• The 750GeV diphoton excess: who introduces it?
• Asymmetric Dark Matter Models and the LHC Diphoton Excess
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• Signal-background interference for a singlet spin-0 digluon resonance at the LHC
• Learning from the New Higgs-like Scalar before It Vanishes
• Diphoton decay for a 750 GeV scalar boson in a $SU(6)\otimes U(1{)}_X$ model
• Minimal Dilaton Model and the Diphoton Excess
• From the 750 GeV Diphoton Resonance to Multilepton Excesses
• Exploring Peaks and Valleys in the Diphoton Spectrum