A pseudoscalar decaying to photon pairs in the early LHC Run 2 data

Abstract

In this paper we explore the possibility of a pseudoscalar resonance to account for the 750 GeV diphoton excess observed both at ATLAS and at CMS. We analyze the ingredients needed from the low energy perspective to obtain a sufficiently large diphoton rate to explain the signal while avoiding constraints from other channels. Additionally, we point out composite Higgs models in which one can naturally obtain a pseudoscalar at the 750 GeV mass scale and we estimate the pseudoscalar couplings to standard model particles that one would have in such models. A generic feature of models that can explain the excess is the presence of new particles in addition to the 750 GeV state. Finally, we note that due to the origin of the coupling of the resonance to photons, one expects to see comparable signals in the $Z\gamma$, $ZZ$, and $WW$ channels.

26 pages, 7 figures, 3 tables; v2: updated tables, added 1 figure, fixed typos, added comments

References in corpus (16)

• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• 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
• Beyond the Minimal Composite Higgs Model
• Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons
• Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions
• Rays of light from the LHC
• Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Search for neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• The LHC diphoton resonance and dark matter
• Di-photon excess illuminates Dark Matter
• Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at sqrt(s) = 8 TeV
• Search for a CP-odd Higgs boson decaying to $Zh$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider
• On the Interpretation of Top Partners Searches
• 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

Cited by in corpus (86)

• The Minimal Model of a Diphoton Resonance: Production without Gluon Couplings
• A Visible QCD Axion from an Enlarged Color Group
• A 750 GeV Dark Pion: Cousin of a Dark G-parity-odd WIMP
• A SUSY Inspired Simplified Model for the 750 GeV Diphoton Excess
• Trinification can explain the di-photon and di-boson LHC anomalies
• Effective interpretations of a diphoton excess
• Radion Candidate for the LHC Diphoton Resonance
• Measuring the diphoton coupling of a 750 GeV resonance
• Running after Diphoton
• A 750 GeV Portal: LHC Phenomenology and Dark Matter Candidates
• Challenges and opportunities for heavy scalar searches in the $t\bar{t}$ channel at the LHC
• Diphoton resonance at 750 GeV in the broken MRSSM
• LHC diphoton excess from colorful resonances
• Toward a coherent solution of diphoton and flavor anomalies
• 750 GeV Diphoton Resonance from Singlets in an Exceptional Supersymmetric Standard Model
• Implications of the diphoton excess on Left-Right models and gauge unification
• Two Higgs doublets to explain the excesses $pp\to \gamma \gamma (750\mathrm{GeV})$ and $h\to {\tau }^{\pm }{\mu }^{\mp }$
• Flavor Universal Resonances and Warped Gravity
• Digamma, what next?
• Realizing Dark Matter and Higgs Inflation in Light of LHC Diphoton Excess
• 750 GeV Diphoton excess from $E_6$ in F-theory GUTs
• Interpreting the 750 GeV digamma excess: a review
• Precision Tests and Fine Tuning in Twin Higgs Models
• The Brother Higgs
• Diphoton Excess in Consistent Supersymmetric SU(5) Models with Vector-like Particles
• Effective Field Theory with Two Higgs Doublets
• Vector-Like Exotics in F-Theory and 750 GeV Diphotons
• Indirect searches of dark matter via polynomial spectral features
• Studying 750 GeV Di-photon Resonance at Photon-Photon Collider
• Modelling vector-like quarks in partial compositeness framework
• 750 GeV Di-photon excess at CERN LHC from a dark sector assisted scalar decay
• Implications of a High-Mass Diphoton Resonance for Heavy Quark Searches
• Tadpole-Induced Electroweak Symmetry Breaking and pNGB Higgs Models
• How Resonance-Continuum Interference Changes 750 GeV Diphoton Excess: Signal Enhancement and Peak Shift
• Kaluza-Klein graviton phenomenology for warped compactifications, and the 750 GeV diphoton excess
• Left-right asymmetry and 750 GeV diphoton excess
• Diphoton excess in phenomenological spin-2 resonance scenarios
• Confronting a New Three-loop Seesaw Model with the 750 GeV Diphoton Excess
• Diphoton Excess and Running Couplings
• One Bump or Two Peaks? The 750 GeV Diphoton Excess and Dark Matter with a Complex Mediator
• Models of LHC Diphoton Excesses Valid up to the Planck scale
• Comments on the diphoton excess: critical reappraisal of effective field theory interpretations
• Note on Spin-2 Particle Interpretation of the 750~GeV Diphoton Excess
• Constraining Composite Higgs Models using LHC data
• Diphotons from Diaxions
• Heavy Fermion Bound States for Diphoton Excess at 750GeV $\sim$ Collider and Cosmological Constraints $\sim$
• Searching for signatures of $E_6$
• Hypercharge Axion and the Diphoton $750$ GeV Resonance
• Di-Photon excess in the 2HDM: hasting towards the instability and the non-perturbative regime
• Electroweak symmetry breaking and collider signatures in the next-to-minimal composite Higgs model
• Diphotons, New Vacuum Angles, and Strong CP
• Resonances from QCD bound states and the 750 GeV diphoton excess
• The $750$ GeV Diphoton Excesses in a Realistic D-brane Model
• Cosmological constraints on Dark Matter models for collider searches
• A 750 GeV Diphoton Signal from a Very Light Pseudoscalar in the NMSSM
• Hidden Pion Varieties in Composite Models for Diphoton Resonances
• Diphoton excess at 750 GeV: gluon-gluon fusion or quark-antiquark annihilation?
• Color-octet Companions of a 750 GeV Heavy Pion
• Improving Fine-tuning in Composite Higgs Models
• The 750GeV diphoton excess: who introduces it?
• Diphotons from an Electroweak Triplet-Singlet
• Asymmetric Dark Matter Models and the LHC Diphoton Excess
• A Flippon Related Singlet at the LHC II
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• LHC Future Prospects of the 750 GeV Resonance
• Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models
• A closer look to the sgoldstino interpretation of the diphoton excess
• Diphoton excess and VV-scattering
• 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
• Has a Higgs-flavon with a $750$ GeV mass been detected at the LHC13?
• 750 GeV Diphotons from Supersymmetry with Dirac Gauginos
• Minimal Dilaton Model and the Diphoton Excess
• Higgs mass and unified gauge coupling in the NMSSM with Vector Matter
• A Megaxion at 750 GeV as a First Hint of Low Scale String Theory
• Implications of the 750 GeV gamma-gamma Resonance as a Case Study for the International Linear Collider
• Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
• Electroweak and Majorana Sector Higgs Bosons and Pseudo-Nambu-Goldstone Bosons
• 750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model
• Phase transition and gravitational waves in maximally symmetric composite Higgs model
• Scrutinizing a di-photon resonance at the LHC through Moscow zero
• The 750 GeV LHC diphoton excess from a baryon number conserving string model
• 750 GeV diphoton excess confronted with a top-pion in the TTM model
• New physics in triboson event topologies
• Noncommutative approach to disclose a Higgs group