CP violation in top physics

Atwood, David; Bar‐Shalom, Shaouly; Eilam, G.; Soni, Amarjit

doi:10.1016/s0370-1573(00)00112-5

Cited by 173 publications

(154 citation statements)

References 291 publications

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“…[10] and references therein. As to top quark spin phenomena at hadron colliders there exists an extensive literature on theoretical investigations within the standard model (SM) [11,12,13,14,15,16,17,18,19] and beyond [20,21,22,23,24,25,26,27,28,29,30,31,32]. Yet the precision of these analyses -in particular within the SM -must be increased for the data samples that will be recorded at the Tevatron and at the LHC to be fully explored.…”

Section: Introductionmentioning

confidence: 99%

Top quark pair production and decay at hadron colliders

Bernreuther

2004

Nuclear Physics B

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In ongoing and upcoming hadron collider experiments, top quark physics will play an important rôle in testing the Standard Model and its possible extensions. In this work we present analytic results for the differential cross sections of top quark pair production in hadronic collisions at next-to-leading order in the QCD coupling, keeping the full dependence on the spins of the top quarks. These results are combined with the corresponding next-to-leading order results for the decay of polarized top quarks into dilepton, lepton plus jets, and all jets final states. As an application we predict double differential angular distributions which are due to the QCD-induced top quark spin correlations in the intermediate state. In addition to the analytic results, we give numerical results in terms of fit functions that can easily be used in an experimental analysis.

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Section: Introductionmentioning

confidence: 99%

Top quark pair production and decay at hadron colliders

Bernreuther

2004

Nuclear Physics B

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“…For convenience, we define two reduced couplings: c t = y t cos θ/y t SM andc t = y t sin θ/y t SM in the following calculations. Although the CP-violating interaction can contribute to the electric dipole moment (EDM), the bounds on the couplingc t rely on the assumption of Higgs couplings to other light fermions [104,105]. Given that these couplings are generally unobservable at the LHC, we do not impose EDM constraints in this study.…”

Section: Jhep01(2015)008mentioning

confidence: 99%

Impact of top-Higgs couplings on Di-Higgs production at future colliders

Liu

Yang

et al. 2015

J. High Energ. Phys.

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Measuring the Higgs-self coupling is one of the most crucial goals of the future colliders, such as the LHC Run-II and the ILC-based photon collider. Since the new physics can affects the di-Higgs production not only from the Higgs self-coupling but also from the top-Higgs coupling, we investigate the di-Higgs production in the presence of the non-standard top-Higgs coupling at the LHC and ILC-based photon collider given the recent Higgs data. Due to the changed interference behaviors of the top quark loops with itself or W boson loops, we find that the cross section of di-Higgs production at the LHC-14 TeV and ILC-500 GeV can be respectively enhanced up to nearly 3 and 2 times the SM predictions within 2σ Higgs data allowed parameter region.

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“…The chargino masses are eigenvalues of the diagonalized mass matrix, X, given by 5) where M 2 is the soft SUSY-breaking SU(2) L gaugino mass parameter and µ is the Higgsino mass parameter. The relevant Lagrangian terms for the quark-down squark-chargino interaction are given by 6) where the index σ refers to chargino mass eigenstates. Y diag u,d are the diagonal up-and downquark Yukawa couplings, and V , U the chargino rotation matrices defined by , 2, 3, 4) are four-component Majorana fermions.…”

Section: The Cp Structure In the Chargino And Neutralino Sectors mentioning

confidence: 99%

“…We showed that, although the channelsts andcs have sizable CP asymmetry with respect to the channelstb andcb, this result has to be taken with caution since the formers have very small branching ratios (Br's) which makes them harder to observe. We calculated (A 2 CP × Br) −1 [4] for each decay mode, which is proportional to the number of required charged Higgs bosons produced at colliders 1 to observe an asymmetry for a given channel [4,5,6]. Based on this analysis, we concluded that H − →cb and H − →tb are the the optimal channels which could reveal a measurable CP asymmetry at the order of 10 − 15%.…”

Section: Introductionmentioning

confidence: 99%

CPasymmetry in charged Higgs decays to chargino-neutralino pairs

Frank

Turan

2007

Phys. Rev. D

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We analyze the charge-parity (CP) asymmetry in the charged Higgs boson decays to chargino-We show first that these modes have a large branching ratio for m H ± 600 GeV. We use Cutkosky rules to obtain the analytical formulas needed for the evaluation of the asymmetry under consideration. We then calculate the CP asymmetry in chargino-neutralino decays by including supersymmetric mass bounds, as well as constraints from b → sγ, (g − 2) µ , ∆ρ and electric dipole moments. Finally, we discuss observability of the asymmetry at the LHC by calculating the number of required charged Higgs events to observe the asymmetry for each decay channel. We show that the inclusion of constraints considerably reduces the projected CP asymmetry, and that the optimal channel for observing the asymmetry is H ± → χ ± 1 χ 0 2 .

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CP violation in top physics

Cited by 173 publications

References 291 publications

Top quark pair production and decay at hadron colliders

Top quark pair production and decay at hadron colliders

Impact of top-Higgs couplings on Di-Higgs production at future colliders

CPasymmetry in charged Higgs decays to chargino-neutralino pairs

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