Interpretation of LHC excesses at 95 GeV and 152 GeV in an extended Georgi-Machacek model

Abstract

We analyze the excesses at 95 GeV in the light Higgs-boson searches in the di-photon decay channel reported by CMS and ATLAS, which combined are at the level of three standard deviations and are compatible with the excess in the $b\bar{b}$ final state observed at LEP, together with an excess in the di-photon channel at around 152 GeV reported based on a sideband analysis. We demonstrate that these excesses can be well described in a minimally extended Georgi-Machacek (meGM) model. This is enabled by four key features of the meGM model: (1) a natural prediction for scalar boson masses of $\lesssim$200 GeV arising from the condition to describe both the Higgs boson signal at 125 GeV and the excesses at 95 GeV, (2) the prediction for a doubly charged Higgs boson that can potentially enhance the di-photon decay rates, (3) asymmetric $WW$ and $ZZ$ couplings to neutral scalar bosons that are induced by mild custodial symmetry breaking, and (4) the approximate preservation of the electroweak $\rho$ parameter to be 1 at tree level. We show in our numerical analysis that the meGM model naturally improves the fit to the LHC data around 152 GeV when describing the excesses at 95 GeV. At the same time, the model also predicts additional light CP-odd and charged scalar bosons that can be potentially probed in future experiments, which motivates dedicated searches in the upcoming LHC runs. We also present the results of sensitivity studies for the 95 and 125 GeV Higgs-boson couplings at the HL-LHC and future $e^{+}{e}^{-}$ colliders, which demonstrate very interesting prospects for probing the meGM model at future colliders.

arXiv comment36 pages, 10 figures, 4 tables, matches the published version, reference added

References in corpus (64)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Search for the Standard Model Higgs Boson at LEP
• HiggsBounds: Confronting Arbitrary Higgs Sectors with Exclusion Bounds from LEP and the Tevatron
• HiggsBounds-4: Improved Tests of Extended Higgs Sectors against Exclusion Bounds from LEP, the Tevatron and the LHC
• HiggsSignals: Confronting arbitrary Higgs sectors with measurements at the Tevatron and the LHC
• HiggsBounds 2.0.0: Confronting Neutral and Charged Higgs Sector Predictions with Exclusion Bounds from LEP and the Tevatron
• A portrait of the Higgs boson by the CMS experiment ten years after the discovery
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC
• The automation of next-to-leading order electroweak calculations
• Model-Independent Bounds on a Light Higgs
• HiggsBounds-5: Testing Higgs Sectors in the LHC 13 TeV Era
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• Measurements of $WH$ and $ZH$ production in the $H\to b\bar{b}$ decay channel in $pp$ collisions at 13 TeV with the ATLAS detector
• $\text{HEPfit}$: a Code for the Combination of Indirect and Direct Constraints on High Energy Physics Models
• The diphoton signal of the light Higgs boson in Natural NMSSM
• $CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H\to \gamma \gamma$ with the ATLAS Detector
• A 96 GeV Higgs Boson in the N2HDM
• Measurements of $\mathrm{t}\bar{\mathrm{t}}$H production and the CP structure of the Yukawa interaction between the Higgs boson and the top quark in the diphoton decay channel
• Phenomenological signatures of additional scalar bosons at the LHC
• Measurements of Higgs boson production cross sections and couplings in the diphoton decay channel at $\sqrt{s}=$ 13 TeV
• Precise prediction for the Higgs-Boson Masses in the $\mu \nu$SSM
• Decays of the neutral Higgs bosons into SM fermions and gauge bosons in the $\mathcal{C}\mathcal{P}$-violating NMSSM
• Searches for additional Higgs bosons and for vector leptoquarks in $\tau \tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations
• Impact of Vacuum Stability Constraints on the Phenomenology of Supersymmetric Models
• The CMS di-photon excess at 95 GeV in view of the LHC Run 2 results
• The 95.4 GeV di-photon excess at ATLAS and CMS
• Measurement of the properties of Higgs boson production at $\sqrt{s}=13$ TeV in the $H\to \gamma \gamma$ channel using $139$ fb${}^{-1}$ of $pp$ collision data with the ATLAS experiment
• The emergence of multi-lepton anomalies at the LHC and their compatibility with new physics at the EW scale
• Vacuum Instabilities in the N2HDM
• Anatomy of inclusive $t\overline{t}W$ production at hadron colliders
• Effects of custodial symmetry breaking in the Georgi-Machacek model at high energies
• Search for the decay of a Higgs boson in the $\ell \ell \gamma$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for dark matter produced in association with a Higgs boson decaying to $\gamma \gamma$ or ${\tau }^{+}{\tau }^{-}$ at $\sqrt{s}=$ 13 TeV
• Custodial symmetry violation in the Georgi-Machacek model
• A 95 GeV Higgs Boson in the Georgi-Machacek Model
• Explanation of the $W$ mass shift at CDF II in the Georgi-Machacek Model
• Dark Matter Phenomenology in 2HDMS in light of the 95 GeV excess
• Explanation of the 95 GeV $\gamma \gamma$ and $b\bar{b}$ excesses in the Minimal Left-Right Symmetric Model
• The 95 GeV Excess in the Georgi-Machacek Model: Single or Twin Peak Resonance
• The anomalous production of multi-lepton and its impact on the measurement of $Wh$ production at the LHC
• Vacuum Stability Conditions for Higgs Potentials with $SU(2{)}_L$ Triplets
• Superposition of CP-Even and CP-Odd Higgs Resonances: Explaining the 95 GeV Excesses within a Two-Higgs Doublet Model
• 95 GeV excess in a $CP$-violating $\mu$-from-$\nu$ SSM
• Search for non-resonant Higgs boson pair production in final states with leptons, taus, and photons in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Interpreting 95 GeV di-photon/$b\bar{b}$ excesses as a lightest Higgs boson of the MRSSM
• Model-independent search for the presence of new physics in events including $H\to \gamma \gamma$ with $\sqrt{s}$ = 13 TeV pp data recorded by the ATLAS detector at the LHC
• Is there a (Pseudo)Scalar at 95 GeV?
• When The Standard Model Higgs Meets Its Lighter 95 GeV Twin
• Anatomy of the Real Higgs Triplet Model
• CP Violation in a Model with Higgs Triplets
• Interpretation of 95 GeV Excess within the Georgi-Machacek Model in Light of Positive Definiteness Constraints
• Vacuum (meta-)stability in the $\mu \nu$SSM
• Exploring Potential Higgs Resonances at 650 GeV and 95 GeV in the 2HDM Type III
• LHC Signatures of the Generic Georgi-Machacek Model

Cited by in corpus (1)

• Low mass scalars at $e^{+}{e}^{-}$ colliders