Probing the Top-Higgs Yukawa CP Structure in dileptonic $t\bar{t}h$ with $M_2$-Assisted Reconstruction

Abstract

Constraining the Higgs boson properties is a cornerstone of the LHC program. We study the potential to directly probe the Higgs-top CP-structure via the $t\bar{t}h$ channel at the LHC with the Higgs boson decaying to a bottom pair and top-quarks in the dileptonic mode. We show that a combination of laboratory and $t\bar{t}$ rest frame observables display large CP-sensitivity, exploring the spin correlations in the top decays. To efficiently reconstruct our final state, we present a method based on simple mass minimization and prove its robustness to shower, hadronization and detector effects. In addition, the mass reconstruction works as an extra relevant handle for background suppression. Based on our results, we demonstrate that the Higgs-top CP-phase $(\alpha )$ can be probed up to $\cos \alpha <0.7$ at the high luminosity LHC.

arXiv comment25 pages, 11 figures, 3 tables

References in corpus (49)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• 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
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Dimension-Six Terms in the Standard Model Lagrangian
• Measuring masses of semi-invisibly decaying particles pair produced at hadron colliders
• Parton distributions with QED corrections
• Determining the Structure of Higgs Couplings at the LHC
• Angular Correlations in Top Quark Pair Production and Decay at Hadron Colliders
• NLO QCD corrections to pp -> t anti-t b anti-b + X at the LHC
• Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
• Constraints on CP-violating Higgs couplings to the third generation
• Very boosted Higgs in gluon fusion
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• Mass Effects in the Higgs-Gluon Coupling: Boosted vs Off-Shell Production
• Jet angular correlation in vector-boson fusion processes at hadron colliders
• Electroweak Baryogenesis in Non-minimal Composite Higgs Models
• Disentangling Higgs-Top Couplings in Associated Production
• Dark Matter Particle Spectroscopy at the LHC: Generalizing MT2 to Asymmetric Event Topologies
• Associated production of a top-quark pair with vector bosons at NLO in QCD: impact on $t\bar{t}H$ searches at the LHC
• A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
• Probing Higgs couplings with high p_T Higgs production
• Boosting the Direct CP Measurement of the Higgs-Top Coupling
• Determining the CP properties of the Higgs boson
• Higgs Quantum Numbers in Weak Boson Fusion
• Superpartner mass measurements with 1D decomposed MT2
• Probing top-partners in Higgs + jets
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• Mass Determination of New States at Hadron Colliders
• \sqrt{s}_min: a global inclusive variable for determining the mass scale of new physics in events with missing energy at hadron colliders
• Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions
• Boosted Higgs Shapes
• Anomalous Top-Higgs Couplings and Top Polarisation in Single Top and Higgs Associated Production at the LHC
• Monte Carlo studies of the jet activity in Higgs + 2 jet events
• Revisiting Combinatorial Ambiguities at Hadron Colliders with MT2
• Pseudoscalar top-Higgs coupling: Exploration of $\mathrm{CP}$-odd observables to resolve the sign ambiguity
• RECO level \sqrt{s}_{min} and subsystem \sqrt{s}_{min}: improved global inclusive variables for measuring the new physics mass scale in missing energy events at hadron colliders
• Probing the CP nature of the Higgs coupling in $t\bar{t}h$ events at the LHC
• On-shell constrained $M_2$ variables with applications to mass measurements and topology disambiguation
• Does the `Higgs' have Spin Zero?
• Probing CP violation in $h\to {\tau }^{-}{\tau }^{+}$ at the LHC
• OPTIMASS: A Package for the Minimization of Kinematic Mass Functions with Constraints
• Measuring Boosted Tops in Semi-leptonic $t\bar{t}$ Events for the Standard Model and Beyond
• Probing the CP properties of top Yukawa coupling at an $e^{+}{e}^{-}$ collider
• Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC
• Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC

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• Light Higgs searches in $t\bar{t}\varphi$ production at the LHC
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• Resolving Combinatorial Ambiguities in Dilepton $t\bar{t}$ Event Topologies with Neural Networks
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• The Higgs program and open questions in particle physics and cosmology
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• Sensitivity to $\mathcal{C}\mathcal{P}$-violating effective couplings in the top-Higgs sector
• Proposal for simplified template cross-sections extension using $\mathcal{C}\mathcal{P}$ observables in $t\overline{t}H$
• Asymmetries in invisible Dark Matter mediator production associated with $t\bar{t}$ final states