Explaining excesses in four-leptons at the LHC with a double peak from a CP violating Two Higgs Doublet Model

Abstract

Extended scalar sectors with additional degrees of freedom appear in many scenarios beyond the Standard Model. Heavy scalar resonances that interact with the neutral current could be discovered via broad resonances in the tails of the four-lepton invariant mass spectrum, where the Standard Model background is small and well understood. In this article we consider a recent ATLAS measurement of four-lepton final states, where the data is in excess over the background for invariant masses above 500 GeV. We discuss the possibility that this excess could be interpreted as a "double peak" from the two extra heavy neutral scalars of a CP violating Two Higgs Doublet Model, both coupling to the $Z$ boson. We apply an iterative fitting procedure to find viable model parameters that can match the excess, resulting in a benchmark point where the observed four-lepton invariant mass spectrum can be explained by two scalar particles $H_2$ and $H_3$, with masses of 540 GeV and 631 GeV, respectively, being admixtures of the CP eigenstates. Our explanation predicts additional production processes for $t\bar{t}$, $W^{+}{W}^{-}$, $4b$ and $\gamma \gamma$, some of which have cross sections close to the current experimental limits. Our results further imply that the electric dipole moment of the electron should be close to the present bounds.

arXiv comment9 pages, 2 figures

References in corpus (34)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Theory and phenomenology of two-Higgs-doublet models
• Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC $pp$ collision data at $\sqrt{s}=$ 7 and 8 TeV
• SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+ e- colliders
• CalcHEP 3.4 for collider physics within and beyond the Standard Model
• SPheno 3.1: extensions including flavour, CP-phases and models beyond the MSSM
• 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
• Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC
• Applying Exclusion Likelihoods from LHC Searches to Extended Higgs Sectors
• A Flavor Kit for BSM models
• Gauge invariant Barr-Zee type contributions to fermionic EDMs in the two-Higgs doublet models
• Search for heavy $ZZ$ resonances in the ${\ell }^{+}{\ell }^{-}{\ell }^{+}{\ell }^{-}$ and ${\ell }^{+}{\ell }^{-}\nu \bar{\nu }$ final states using proton proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Higgs boson production cross-section measurements and their EFT interpretation in the $4\ell$ decay channel at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Search for heavy diboson resonances in semileptonic final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Let there be light from a second light Higgs doublet
• Measurements of production cross sections of the Higgs boson in the four-lepton final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Light Signals from a Lighter Higgs
• Electron EDM in the complex two-Higgs doublet model
• The emergence of multi-lepton anomalies at the LHC and their compatibility with new physics at the EW scale
• Search for resonances decaying into photon pairs in 139 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Measurement of the $t\bar{t}$ production cross-section in the lepton+jets channel at $\sqrt{s}=13$TeV with the ATLAS experiment
• Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
• Two-Higgs-Doublet Model with Soft CP-violation Confronting Electric Dipole Moments and Colliders
• The "96 GeV excess" at the LHC
• Electron EDM and Muon anomalous magnetic moment in Two-Higgs-Doublet Models
• Double Higgs peak in the minimal SUSY B-L model
• Evidence of the true Higgs boson $H_T$ at the LHC Run 2
• Testing CP Properties of Extra Higgs States at the HL-LHC
• Experimental signals for a second resonance of the Higgs field
• Indications for extra scalars at LHC? -- BSM physics at future $e^{+}{e}^{-}$ colliders
• Signature of the Maximally Symmetric 2HDM via $W^{\pm }/Z$-Quadruplet Productions at the LHC
• Global interpretation of LHC indications within the Georgi-Machacek Higgs model

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