Pseudoscalar top-Higgs coupling: Exploration of $\mathrm{CP}$-odd observables to resolve the sign ambiguity

Abstract

We present a collection of $\mathrm{CP}$-odd observables for the process $pp\to t\left(\to b{\ell }^{+}{\nu }_{\ell }\right)\bar{t}\left(\to \bar{b}{\ell }^{-}{\bar{\nu }}_{\ell }\right)H$ that are linearly dependent on the scalar (${\kappa }_t$) and pseudoscalar (${\tilde{\kappa }}_t$) top-Higgs coupling and hence sensitive to the corresponding relative sign. The proposed observables are based on triple product (TP) correlations that we extract from the expression for the differential cross section in terms of the spin vectors of the top and antitop quarks. In order to explore other possibilities, we progressively modify these TPs, first by combining them, and then by replacing the spin vectors by the lepton momenta or the $t$ and $\bar{t}$ momenta by their visible parts. We generate Monte Carlo data sets for several benchmark scenarios, including the Standard Model (${\kappa }_t=1$, ${\tilde{\kappa }}_t=0$) and two scenarios with mixed $\mathrm{CP}$ properties (${\kappa }_t=1$, ${\tilde{\kappa }}_t=\pm 1$). Assuming an integrated luminosity that is consistent with that envisioned for the High Luminosity Large Hadron Collider, using Monte Carlo-truth and taking into account only statistical uncertainties, we find that the most promising observable can disentangle the "$\mathrm{CP}$-mixed" scenarios with an effective separation of $\sim 19\sigma$. In the case of observables that do not require the reconstruction of the $t$ and $\bar{t}$ momenta, the power of discrimination is up to $\sim 13\sigma$ for the same number of events. We also show that the most promising observables can still disentangle the $\mathrm{CP}$-mixed scenarios when the number of events is reduced to values consistent with expectations for the Large Hadron Collider in the near term.

arXiv comment28 pages, 7 figures. Published version

References in corpus (52)

• 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
• Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
• Multi-Parton Amplitudes in Gauge Theories
• NLO QCD corrections to t anti-t H production in hadron collisions
• Top quark pair production and decay at hadron colliders
• Measurement of the differential cross section for top quark pair production in pp collisions at sqrt(s) = 8 TeV
• Angular Correlations in Top Quark Pair Production and Decay at Hadron Colliders
• Extension of the Chiral Perturbation Theory Meson Lagrangian to Order $P^6$
• Measurement of differential top-quark pair production cross sections in pp collisions at sqrt(s) = 7 TeV
• Constraints on CP-violating Higgs couplings to the third generation
• Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Updated Global Analysis of Higgs Couplings
• Associated Top Quark-Higgs Boson Production at the LHC
• Efficient Identification of Boosted Semileptonic Top Quarks at the LHC
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• Maximizing Spin Correlations in Top Quark Pair Production at the Tevatron
• Measurement of the Top Quark Mass Using Dilepton Events
• Higgs Precision (Higgcision) Era begins
• Disentangling Higgs-Top Couplings in Associated Production
• Determining the top-antitop and $ZZ$ Couplings of a Neutral Higgs Boson of Arbitrary CP Nature at the NLC
• Spin Correlation Effects in Top Quark Pair Production at the LHC
• Lifting degeneracies in Higgs couplings using single top production in association with a Higgs boson
• Boosting the Direct CP Measurement of the Higgs-Top Coupling
• Is there room for CP violation in the top-Higgs sector?
• Determining the CP properties of the Higgs boson
• Lab-frame observables for probing the top-Higgs interaction
• Measuring CP Violation in $h\to {\tau }^{+}{\tau }^{-}$ at Colliders
• The couplings of the Higgs boson and its CP properties from fits of the signal strengths and their ratios at the 7+8 TeV LHC
• Determing the CP Nature of a Neutral Higgs Boson at the LHC
• Anomalous Top-Higgs Couplings and Top Polarisation in Single Top and Higgs Associated Production at the LHC
• Measurements of spin correlation in top-antitop quark events from proton-proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• Exploring the Anomalous Higgs-top Couplings
• Analytical solution of ttbar dilepton equations
• Measurement of the charge asymmetry in dileptonic decays of top quark pairs in $pp$ collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• T-odd correlations from CP violating anomalous top-quark couplings revisited
• Constraints on anomalous color dipole operators from Higgs boson production at the LHC
• Determining the relative size of the CP-even and CP-odd Higgs Boson Couplings to a Fermion at the LHC
• Enhancing the ttH signal through top-quark spin polarization effects at the LHC
• Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the 100 TeV $pp$ Collider
• Electroweak Baryogenesis with Anomalous Higgs Couplings
• Angular distributions in $t\bar{t}H(H\to b\bar{b})$ reconstructed events at the LHC
• Probing CP violation in $e^{+}{e}^{-}$ production of the Higgs boson and toponia
• Golden Probe of the Top Yukawa
• Probing CP-violating $h\bar{t}t$ coupling in $e^{+}{e}^{-}\to h\gamma$
• Associated Production of Higgs Boson and $t\bar{t}$ at LHC
• Using t -> b \bar{b} c to Search for New Physics
• Search for New Physics in Rare Top Decays: $t\bar{t}$ Spin Correlations and Other Observables
• Measuring CP-Violating Observables in Rare Top Decays at the LHC
• Detecting New Physics in Rare Top Decays at the LHC
• Search for New Physics in Rare Top Decays

Cited by in corpus (28)

• The Standard Model as an Effective Field Theory
• Constraining anomalous Higgs boson couplings to the heavy flavor fermions using matrix element techniques
• Probing the Top-Higgs Yukawa CP Structure in dileptonic $t\bar{t}h$ with $M_2$-Assisted Reconstruction
• Optimized probes of $CP$-odd effects in the $t\bar{t}h$ process at hadron colliders
• Machine learning the Higgs boson-top quark CP phase
• Direct Higgs-top CP-phase measurement with $t\bar{t}h$ at the 14 TeV LHC and 100 TeV FCC
• Constraining CP-violation in the Higgs-top-quark interaction using machine-learning-based inference
• Probing the $CP$ nature of the top quark Yukawa at hadron colliders
• CP tests of Higgs couplings in $t\bar{t}h$ semileptonic events at the LHC
• Electric dipole moment of ${}^{199}$Hg atom from P, CP-odd electron-nucleon interaction
• Probing CP violation in $h\to {\tau }^{-}{\tau }^{+}$ at the LHC
• Returning CP-Observables to The Frames They Belong
• Probing for Extra Top Yukawa Couplings in Light of $t\bar{t}h(125)$ Observation
• Unraveling the CP phase of top-Higgs coupling in associated production at the LHC
• CP-violation, Asymmetries and Interferences in $t\bar{t}\varphi$
• Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC
• Top and bottom tensor couplings from a color octet scalar
• P-even, CP-violating Signals in Scalar-Mediated Processes
• Probing the CP Structure of the Top Quark Yukawa at the Future Muon Collider
• Scalar mass dependence of angular variables in $t\bar{t}\varphi$ production
• Associated production of a top-quark pair with two isolated photons at the LHC through NLO in QCD
• Enhancing $CP$ Measurement of the Yukawa Interactions of Top-Quark at $e^{-}{e}^{+}$ Collider
• Top polarisation as a probe of CP-mixing top-Higgs coupling in $tjh$ signals
• Investigating Bottom-Quark Yukawa Interaction at Higgs Factory
• Sensitivity to $\mathcal{C}\mathcal{P}$-violating effective couplings in the top-Higgs sector
• Prospect study for measurement of $Hb\bar{b}$ coupling at the LHC and FCC-hh
• Testing CP-violation in a Heavy Higgs Sector at CLIC
• Asymmetries in invisible Dark Matter mediator production associated with $t\bar{t}$ final states