Diphotons from Tetraphotons in the Decay of a 125 GeV Higgs at the LHC

Abstract

Recently the ATLAS and CMS experiments have presented data hinting at the presence of a Higgs boson at $m_h\simeq 125$ GeV. The best-fit $h\to \gamma \gamma$ rate averaged over the two experiments is approximately $2.1\pm 0.5$ times the Standard Model prediction. We study the possibility that the excess relative to the Standard Model is due to $h\to aa$ decays, where $a$ is a light pseudoscalar that decays predominantly into $\gamma \gamma$. Although this process yields $4\gamma$ final states, if the pseudoscalar has a mass of the order tens of MeV, the two photons from each $a$ decay can be so highly collimated that they may be identified as a single photon. Some fraction of the events then contribute to an effective $h\to \gamma \gamma$ signal. We study the constraints on the parameter space where the net $h\to \gamma \gamma$ rate is enhanced over the Standard Model by this mechanism and describe some simple models that give rise to the pseudoscalar-photon interaction. Further tests and prospects for searches in the near future are discussed.

arXiv comment14 pages, 7 figures, revtex4-1; v2: references added and rearranged, g-2 limit improved, published version; v3: typos corrected

References in corpus (47)

• MadGraph 5 : Going Beyond
• Reevaluation of the Hadronic Contributions to the Muon g-2 and to alpha(MZ)
• Combined results of searches for the standard model Higgs boson in pp collisions at sqrt(s) = 7 TeV
• A 125 GeV SM-like Higgs in the MSSM and the $\gamma \gamma$ rate
• A SM-like Higgs near 125 GeV in low energy SUSY: a comparative study for MSSM and NMSSM
• Interpreting the LHC Higgs Search Results in the MSSM
• Hadronic light-by-light corrections to the muon g-2: the pion-pole contribution
• Model-Independent Bounds on a Light Higgs
• A Higgs boson near 125 GeV with enhanced di-photon signal in the NMSSM
• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
• Fingerprinting Higgs Suspects at the LHC
• Search for neutral Higgs bosons decaying to tau pairs in pp collisions at sqrt(s) = 7 TeV
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Photon Events with Missing Energy in e+e- Collisions at sqrt{s} = 130 to 209 GeV
• Nonstandard Higgs Boson Decays
• Light Axion within the Next-to-Minimal Supersymmetric Standard Model
• h\to γγIn Inert Higgs Doublet Model
• On a Light Spinless Particle Coupled to Photons
• Higgs Boson Decays to CP-odd Scalars at the Tevatron and Beyond
• Improved Measurement of the K+ to pi+ nu nubar Branching Ratio
• Search for the Standard Model Higgs boson in the decay channel H->ZZ(*)->4l with 4.8 fb-1 of pp collision data at sqrt(s) = 7 TeV with ATLAS
• Higgs boson decay into 2 photons in the type~II Seesaw Model
• Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio
• Search for the standard model Higgs boson decaying to a W pair in the fully leptonic final state in pp collisions at sqrt(s) = 7 TeV
• Search for the standard model Higgs boson in the decay channel H to ZZ to 4 leptons in pp collisions at sqrt(s) = 7 TeV
• A New Measurement of the ${\pi }^0$ Radiative Decay Width
• The NMSSM Solution to the Fine-Tuning Problem, Precision Electroweak Constraints and the Largest LEP Higgs Event Excess
• Could the excess seen at 124-126 GeV be due to the Randall-Sundrum Radion?
• Implications of LHC Searches on SUSY Particle Spectra: The pMSSM Parameter Space with Neutralino Dark Matter
• Search for Light CP-odd Higgs in Radiative Decays of Upsilon(1S)
• Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles
• Search for the standard model Higgs boson decaying to bottom quarks in pp collisions at sqrt(s) = 7 TeV
• Update of g-2 of the muon and Delta alpha
• Search for one large extra dimension with the DELPHI detector at LEP
• Visible Cascade Higgs Decays to Four Photons at Hadron Colliders
• Observation of the Decay K^+ --> pi^+ gamma gamma
• Study of Tau-pair Production in Photon-Photon Collisions at LEP and Limits on the Anomalous Electromagnetic Moments of the Tau Lepton
• Constraining Light Bosons with Radiative ${\rm Y}(1S)$ Decays
• Upper Limit on the Branching Ratio for the Decay ${\pi }^0\to \nu \bar{\nu }$
• Unburied Higgs
• Observation of J/psi --> 3 gamma
• Search for the Decay J/psi -> gamma + invisible
• Higgs Boson Decay into Hadronic Jets
• Buried Higgs
• Observation of Radiative Leptonic Decay of the Tau Lepton
• The Pion-Photon Transition Form Factor and New Physics in the Tau Sector

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• Higgs diphoton rate and mass enhancement with vector-like leptons and the scale of supersymmetry
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• A 750 GeV Diphoton Signal from a Very Light Pseudoscalar in the NMSSM
• Left-right supersymmetry after the Higgs boson discovery
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• TASI Lectures on Jet Substructure
• Light Axion-Like Particles at Future Lepton Colliders
• Various Models Mimicking the SM Higgs Boson
• Multi-step production of a diphoton resonance