Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation

Abstract

Joint energy distribution of the bottom quark and antiquark from decays of the top quark and antiquark produced in the reaction $e^{+}{e}^{-}\to t\bar{t}$ is studied. Main emphasis is put on $CP$-violation effects in the interaction of the photon and $Z$ boson with the top quarks. Energy asymmetries of $b$ and $\bar{b}$ quarks, which give access to the $CP$-violating terms, are considered. To estimate the magnitude of these asymmetries, the $CP$-violating $\gamma tt$ and $Ztt$ couplings are calculated in one-loop model with exchange of the Higgs boson with the mass of $125$ GeV. Interaction of this boson with the top quarks is assumed to include scalar and pseudoscalar couplings. Values of these couplings are constrained from the recent CMS analysis. Energy dependence of the asymmetries of $b$ and $\bar{b}$ quarks is calculated up to $\sqrt{s}=1.2$ TeV and some interesting features of their behavior are observed. These observables can be of interest for future studies at electron$-$positron colliders CLIC and ILC.

arXiv comment13 pages, 7 figures, revtex4-2 style; v2: published version

References in corpus (25)

• Dimension-Six Terms in the Standard Model Lagrangian
• Electroweak corrections to the muon anomalous magnetic moment
• Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
• Two-loop QCD Corrections to the Heavy Quark Form Factors: the Vector Contributions
• CP Violation in Top Physics
• Two-Loop QCD Corrections to the Heavy Quark Form Factors: Anomaly Contributions
• 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
• Two-Loop QCD Corrections to the Heavy Quark Form Factors: Axial Vector Contributions
• Top Dipole Form Factors and Loop-induced CP-violation in Supersymmetry
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions in its production and decay using the four-lepton final state
• Top and Beauty synergies in SMEFT-fits at present and future colliders
• CP Violation in top pair production at an e^+e^- collider
• The Compact Linear e${}^{+}$e${}^{-}$ Collider (CLIC): Physics Potential
• QCD Corrections to Static Heavy Quark Form Factors
• Energy Spectrum of Secondary Leptons in $e^{+}{e}^{-}\to t\bar{t}$ - Non-standard Interactions and CP Violation -
• Dipole Form Factors and Loop-induced CP-violation in Supersymmetry
• Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair
• Polarization effects in the Higgs boson decay to gamma Z and test of CP and CPT symmetries
• The Weak-Magnetic Moment of Heavy Quarks
• Decay of the Higgs boson to ${\tau }^{-}{\tau }^{+}$ and non-Hermiticity of the Yukawa interaction
• CP violation in e+e- -> t tbar: Energy Asymmetries and Optimal Observables of b and bbar Quarks
• Probing the CP-Violation effects in the $h\tau \tau$ coupling at the LHC
• CP violating asymmetries of b quarks and leptons in e^+e^- \to t\bar t and supersymmetry (review)
• The top-quark polarization beyond the Standard Model in electron-positron annihilation
• Energy and angular distributions of the bottom quark in the electron-positron annihilation $e^{+}{e}^{-}\to b{W}^{+}\bar{t}$