CP Violation in Top Quark Pair Production at Hadron Colliders

Abstract

CP violating effects in top quark pair production at the future 2 TeV $p\bar{p}$ Tevatron and 14 TeV $pp$ LHC colliders are investigated. We study three kinds of CP violating sources:the supersymmetric CP-odd phase of the stop trilinear soft breaking term: $arg(A_t)$, the CP-odd parameter in two-Higgs doublet extensions of the standard model(2HDM), and the model-independent top quark chromoelectric dipole moment(CEDM), respectively. Optimal observables as well as simple observables are used. We find that it is possible to observe CP violating effects from $arg(A_t)$ in top quark pair production at the 2 TeV Tevatron with $\sim 30f{b}^{-1}$ integrated luminosity when $m_{\tilde{g}}\sim 200$ GeV. If the experimental systematic errors are sufficient small, the LHC with $\sim 150f{b}^{-1}$ can put a limit of order $10^{-1}$ on the phase $arg(A_t)$ and the CP-odd parameter in 2HDM by using optimal observables. The CEDM of the top quark can be measured to an accuracy of $10^{-18}cm{g}_s$ at the Tevatron and few $\times 10^{-20}cm{g}_s$ at the LHC.

28 pages,3 figures, 38 refs

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• CP violating anomalous top-quark couplings at the LHC
• Analytical solution of ttbar dilepton equations
• Search for anomalous top-gluon couplings at LHC revisited
• Parity Violating Asymmetries in Top Pair Production at Hadron Colliders
• Probing chromomagnetic and chromoelectric couplings of the top quark using its polarization in pair production at hadron colliders
• Top quark physics at the LHC
• Algebraic approach to solve $t\bar{t}$ dilepton equations
• CP-odd correlations using jet momenta from tt_bar events at the Tevatron
• Probing Top Anomalous Couplings at the Tevatron and the Large Hadron Collider
• Higgs production as a probe of anomalous top couplings
• Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in $tW$ production at the Large Hadron Collider
• CP violation in tbW couplings at the LHC
• Chromomagnetic and chromoelectric dipole moments of the top quark in the 4GTHDM
• Polarized Single Top Production at Leptonic Colliders from Broken R Parity Interactions Incorporating CP Violation
• Search for New Physics in Rare Top Decays: $t\bar{t}$ Spin Correlations and Other Observables
• T-odd anomalous interactions of the top-quark at the Large Hadron Collider