CP asymmetries in top quark pair production and decay: contributions from neutral Higgs boson and gluino exchange

Bernreuther, W.; Overmann, P.

doi:10.1007/bf01552627

Cited by 32 publications

(38 citation statements)

References 28 publications

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“…For theoretical investigations of CP violation in top production and decay in other contexts we refer to [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Top-quark production in hadron-hadron collisions and anomalous top-quark–gluon couplings

1996

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Abstract:We discuss the influence of anomalous ttG couplings on total and differential tt production cross sections in hadron-hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment, d t -µ ′ t plane, we find a whole region where the anomalous couplings give a zero net contribution to the total top production rate. In differential cross sections, the anomalous moments have to be quite sizable to give measurable effects. We estimate the values of d ′ t and µ ′ t which are allowed by the present Tevatron experimental results on top production. A chromoelectric dipole moment of the top violates CP invariance. We discuss a simple CP-odd observable which allows for a direct search for CP violation in top production.

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Section: Introductionmentioning

confidence: 99%

Top-quark production in hadron-hadron collisions and anomalous top-quark–gluon couplings

1996

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“…In the case of Higgs sector CP violation one expects, in particular, a spectrum of neutral Higgs particles with indefinite CP parity. This can be traced through large Yukawa couplings to heavy fermions, notably to top quarks [4,5,6,7,8,9,10,11,12,13,14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Probing Higgs sectorCPviolation with top quarks at a photon linear collider

1995

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We investigate for two-Higgs doublet models with intrinsic CP violation in the scalar potential CP-nonconserving effects in unpolarized γγ → tt for a range of neutral Higgs boson masses which includes resonant ϕ production and the subsequent decay of ϕ → tt. The importance of taking into account, even in the resonant case, the interference with the nonresonant background is shown. Further, we propose and calculate three asymmetries which efficiently trace CP-violating effects in γγ → tt using semileptonic tt decays. † Research supported in part by the Deutsche Forschungsgemeinschaft.

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“…Various types of "naive" observables to deduce the real and imaginary parts of the non-standard form factors in top production and decay were considered in [17,16,143,165,174,175,178,179,180]. These observables are constructed simply from correlations between momenta of the decaying products of the top quark.…”

Section: Naive Observables Constructed From Momenta Of the Top Decay mentioning

confidence: 99%

“…This may also be achieved in some limiting cases using naive observables. In [143,165] a naive observable that projects onto CP violation in the top decay vertex was suggested…”

Section: Naive Observables Constructed From Momenta Of the Top Decay mentioning

confidence: 99%

CP violation in top physics

et al. 2001

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CP violation in top physics is reviewed. The Standard Model has negligible effects, consequently CP violation searches involving the top quark may constitute the best way to look for physics beyond the Standard Model. Non-standard sources of CP violation due to an extended Higgs sector with and without natural flavor conservation and supersymmetric theories are discussed. Experimental feasibility of detecting CP violation effects in top quark production and decays in high energy e + e − , γγ, µ + µ − , pp and pp colliders are surveyed. Searches for the electric, electro-weak and the chromo-electric dipole moments of the top quark in e + e − → tt and in pp → ttX are descibed. In addition, other mechanisms that appear promising for experiments, e.g., tree-level CP violation in e + e − → tth, ttZ, ttν eνe and in the top decay t → bτ ν τ and CP violation driven by s-channel Higgs exchanges in pp, γγ, µ + µ − → tt etc., are also discussed. * A 2-up version of this postscript file may be obtained at the url

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CP asymmetries in top quark pair production and decay: contributions from neutral Higgs boson and gluino exchange

Cited by 32 publications

References 28 publications

Top-quark production in hadron-hadron collisions and anomalous top-quark–gluon couplings

Top-quark production in hadron-hadron collisions and anomalous top-quark–gluon couplings

Probing Higgs sectorCPviolation with top quarks at a photon linear collider

CP violation in top physics

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