CP violation in tbW couplings at the LHC

Abstract

We study in a model-independent way anomalous CP-violating tbW effective couplings that might arise from new physics in the processes pp-> tW^- X and pp-> tbar W^+X, followed by semileptonic decay of t and tbar. These processes have a dependence on effective tbW couplings both in the production process as well as in the decay of the t or tbar. We propose several CP-violating asymmetries constructed out of variables in the two processes, including t and tbar polarization, and energy and azimuthal angles of the decay particles. We find that it is feasible to probe a certain CP-violating combination of anomalous couplings at the per cent level at the LHC for centre-of-mass energy 14 TeV and an integrated luminosity of 10 fb^{-1}.

12 pages, 2 Figures

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Cited by in corpus (15)

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• Top polarisation studies in $H^{-}t$ and $Wt$ production
• Enhanced $thj$ signal at the LHC with $h\to \gamma \gamma$ decay and $\mathcal{C}\mathcal{P}$-violating top-Higgs coupling
• Probing chromomagnetic and chromoelectric couplings of the top quark using its polarization in pair production at hadron colliders
• Breaking down the entire spectrum of spin correlations of a pair of particles involving fermions and gauge bosons
• Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in $tW$ production at the Large Hadron Collider
• Unraveling the CP phase of top-Higgs coupling in associated production at the LHC
• Top and bottom tensor couplings from a color octet scalar
• Measuring the charged Higgs mass and distinguishing between models with top-quark observables
• On two-body and three-body spin correlations in leptonic $t\bar{t}Z$ production and anomalous couplings at the LHC
• Top polarisation as a probe of CP-mixing top-Higgs coupling in $tjh$ signals
• Polarization of a vector boson produced in decay of a heavy fermion in an arbitrary frame
• Associated Production of Single Top Quark and W-boson Through Anomalous Couplings at LHeC based $\gamma p$ Colliders
• Why the angular distribution of the top decay lepton is unchanged by anomalous $tbW$ coupling