Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios

Abstract

We investigate the LHC phenomenology of a model where the Standard Model (SM) scalar sector is extended by two real scalar singlets. A ${\mathbb{Z}}_2\otimes {\mathbb{Z}}_2^{\prime }$ discrete symmetry is imposed to reduce the number of scalar potential parameters, which is spontaneously broken by the vacuum expectation values of the singlet fields. As a result, all three neutral scalar fields mix, leading to three neutral CP-even scalar bosons, out of which one is identified with the observed Higgs boson at 125 GeV. We explore all relevant collider signatures of the three scalars in this model. Besides the single production of a scalar boson decaying directly to SM particle final states, we extensively discuss the possibility of resonant multi-scalar production. The latter includes decays of the produced scalar boson to two identical scalars ("symmetric decays"), as well as to two different scalars ("asymmetric decays"). Furthermore, we discuss the possibility of successive decays to the lightest scalar states ("cascade decays"), which lead to experimentally spectacular three- and four-Higgs final states. We provide six benchmark scenarios for detailed experimental studies of these Higgs-to-Higgs decay signatures.

36 pages, 15 figures, data for the benchmark scenarios available upon request, text updated to match published version

References in corpus (16)

• LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
• The oblique parameters in multi-Higgs-doublet models
• Complex Singlet Extension of the Standard Model
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Testing Electroweak Baryogenesis with Future Colliders
• A precision constraint on multi-Higgs-doublet models
• Minimal Extension of the Standard Model Scalar Sector
• Exploring Resonant di-Higgs production in the Higgs Singlet Model
• Delta r and the W-boson mass in the Singlet Extension of the Standard Model
• The Minimal Scale Invariant Extension of the Standard Model
• Standard Model with a Complex Scalar Singlet: Cosmological Implications and Theoretical Considerations
• Wrong sign and symmetric limits and non-decoupling in 2HDMs
• Di-Higgs Peaks and Top Valleys: Interference Effects in Higgs Sector Extensions
• The vacuum structure of the Higgs complex singlet-doublet model
• Detecting multimuon jets from the Higgs exotic decays in the Higgs portal framework

Cited by in corpus (55)

• 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
• Direct detection and complementary constraints for sub-GeV dark matter
• Benchmarking Di-Higgs Production in Various Extended Higgs Sector Models
• Quantum Anomaly Detection for Collider Physics
• Search for Higgs boson decays into a pair of pseudoscalar particles in the $bb\mu \mu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• The forgotten channels: charged Higgs boson decays to a $W^{\pm }$ and a non-SM-like Higgs boson
• Primordial Black Holes from Conformal Higgs
• HL-LHC and ILC sensitivities in the hunt for heavy Higgs bosons
• HHH Whitepaper
• Triple Higgs Boson Production at the Large Hadron Collider with Two Real Singlet Scalars
• ATLAS searches for additional scalars and exotic Higgs boson decays with the LHC Run 2 dataset
• Searches for Higgs boson production through decays of heavy resonances
• The 7% Rule: A Maximum Entropy Prediction on New Decays of the Higgs Boson
• Search for a massive scalar resonance decaying to a light scalar and a Higgs boson in the four b quarks final state with boosted topology
• Two-Real-Singlet-Model Benchmark Planes
• Higgs boson decays into narrow di-photon jets and their search strategies at the Large Hadron Collider
• A short overview on low mass scalars at future lepton colliders
• A search for triple Higgs boson production in the $6b$ final state using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Primordial Black Hole Formation via Inverted Bubble Collapse
• A Simple Model of Dark Matter and CP Violation
• Resonant Multi-Scalar Production in the Generic Complex Singlet Model in the Multi-TeV Region
• Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the $\mu \mu$bb and $\tau \tau$bb final states
• Naturalness Implications within the Two-Real-Scalar-Singlet beyond the SM
• Sensing Higgs cascade decays through memory
• Search for a new resonance decaying into two spin-0 bosons in a final state with two photons and two bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for a new heavy scalar particle decaying into a Higgs boson and a new scalar singlet in final states with one or two light leptons and a pair of $\tau$-leptons with the ATLAS detector
• Triple Higgs boson production and electroweak phase transition in the two-real-singlet model
• The hierarchy problem and the vacuum stability in two-scalar dark matter model
• Gravitational waves from first-order electroweak phase transition in a model with light sgoldstinos
• Search for new particles in an extended Higgs sector with four b quarks in the final state at $\sqrt{s}=$ 13 TeV
• Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into $b\bar{b}{\tau }^{+}{\tau }^{-}$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Neural networks for boosted di-$\tau$ identification
• Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons in proton-proton collisions at a center of mass energy of 13 TeV with the ATLAS detector
• Search for new resonances decaying to pairs of merged diphotons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Maximal value for trilinear Higgs coupling in a 3-3-1 EFT
• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders
• On interference effects in top-philic decay chains
• Search for a new scalar resonance decaying to a Higgs boson and another new scalar particle in the final state with two bottom quarks and two photons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Calibration of a soft secondary vertex tagger using proton-proton collisions at $\sqrt{s}=$13 TeV with the ATLAS detector
• Pseudo scalar dark matter in a generic U$(1{)}_X$ model
• Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$ with the ATLAS detector
• Search for resonances decaying to an anomalous jet and a Higgs boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb${}^{-1}$ of data collected at $\sqrt{s}$=13 and 13.6 TeV with the ATLAS detector
• Low mass scalars at $e^{+}{e}^{-}$ colliders
• Confronting the broken phase N2HDM with Higgs Data
• Investigating Boson Sector in an Extended Standard Model with $U(1{)}_D$ Symmetry
• Search for a resonance decaying into a scalar particle and a Higgs boson in final states with leptons and two photons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Probing new physics in the Boosted $HH\to b\bar{b}\gamma \gamma$ channel at the LHC
• Scalar Lie point symmetries of the Standard Model with one or two real gauge singlets
• Dark Matter in Multi-Singlet Extensions of the Standard Model
• RelExt: A New Dark Matter Tool for the Exploration of Dark Matter Models
• Prospects for Higgs boson and new scalar resonant production searches in ttbb final state at the LHC
• Interference effects in new physics searches
• The Higgs Boson and its Physics -- an Overview