Z decays to top quarks

Kühn, Johann H.; Reiter, A.; Zerwas, P.M.

doi:10.1016/0550-3213(86)90235-x

Cited by 82 publications

(71 citation statements)

References 6 publications

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“…The dynamical factors Φ are around 0.1 or larger, such that the P -wave induced effects should be observable experimentally. The normal component of the polarization which is proportional to ϕ I has been predicted for stable quarks in the framework of perturbative QCD [26,25]. In the threshold region the phase can be traced to the tt rescattering by the QCD potential.…”

Section: Polarizationmentioning

confidence: 99%

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Top quark polarization in polarized $e^+e^-$ annihilation near threshold

Harlander

Jeżabek²,

Kühn

et al. 1997

Zeitschrift f�r Physik C Particles and Fields

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Top quark polarization in e + e − annihilation into tt is calculated for linearly polarized beams. The Green function formalism is applied to this reaction near threshold. The Lippmann-Schwinger equations for the S-wave and P -wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula for large momentum transfer and Richardson's ansatz for intermediate and small momenta. S-P -wave interference contributes to all components of the top quark polarization vector. Rescattering of the decay products is considered. The mean values nℓ of the charged lepton fourmomentum projections on appropriately chosen directions n in semileptonic top decays are proposed as experimentally observable quantities sensitive to top quark polarization. The results for nℓ are obtained including S-P -wave interference and rescattering of the decay products. It is demonstrated that for the longitudinally polarized electron beam a highly polarized sample of top quarks can be produced.

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Section: Polarizationmentioning

confidence: 99%

“…A system of reference with s defined with respect to the top quark momentum [25] is convenient in the high energy limit but evidently becomes less convenient close to threshold. The differential cross section for production of a top quark of three-momentum p and spin projection +1/2 on direction s + reads 4…”

Section: Polarizationmentioning

confidence: 99%

Top quark polarization in polarized $e^+e^-$ annihilation near threshold

Harlander

Jeżabek²,

Kühn

et al. 1997

Zeitschrift f�r Physik C Particles and Fields

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“…Since, highly polarized top quarks will become available at hadron colliders through single top production processes, which occur at the 33% level of the tt pair production rate [52], and in top quark pairs produced in future linear e + e − -colliders [53][54][55] …”

Section: Jhep03(2017)051mentioning

confidence: 99%

QCD analysis of light charged Higgs production through polarized top quark decay in two different frames

Nejad

Abbaspour

2017

J. High Energ. Phys.

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Light and heavy charged Higgs bosons are predicted by many models with an extended Higgs sector such as the two-Higgs-doublet model (2HDM). Searches for the charged Higgs bosons have been done by the ATLAS and the CMS experiments at the Large Hadron Collider (LHC) in proton-proton collision. However, a definitive search of charged Higgs bosons still has to be carried out by the LHC experiments. The experimental observation of charged Higgs bosons would indicate physics beyond the Standard Model. In the present work we study the O(α s ) correction to the energy spectrum of the inclusive bottom-flavored mesons (X b ) in polarized top quark decays into a light charged Higgs boson (m H + < m t ) and a massless bottom quark followed by the hadronization process b → X b in the type-I 2HDM, i.e. t(↑) → H + b → H + X b + Jet. This spin-dependent energy distribution is studied in two different helicity coordinate systems. This study could be considered as a new channel to indirect search for the charged Higgs bosons. To present our phenomenological predictions, we restrict ourselves to the constraints on the m H + − tan β parameter space determined by the recent results of the CMS and the ATLAS collaborations.

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“…Thus, studying the tt spin correlations provides an interesting possibility to test the SM and search for new physics. This fact has made that the spin correlation of the tt production at the ILC experiments has been extensively studied in the SM and new physics beyond the SM [8,9,10]. This paper is aimed at investigating the effects of the non-universal neutral gauge boson Z ′ predicted by the topcolor scenario on the top quark pair production via the process e − e + → tt, and seeing whether the possible signatures of Z ′ can be detected via measuring the tt spin correlation observable in the future ILC experiments.…”

Section: Introductionmentioning

confidence: 99%

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders

Yue¹,

Wang²

2006

J. Phys. G: Nucl. Part. Phys.

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Z decays to top quarks

Cited by 82 publications

References 6 publications

Top quark polarization in polarized $e^+e^-$ annihilation near threshold

Top quark polarization in polarized $e^+e^-$ annihilation near threshold

QCD analysis of light charged Higgs production through polarized top quark decay in two different frames

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders

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Z decays to top quarks

Cited by 82 publications

References 6 publications

Top quark polarization in polarized $e^+e^-$ annihilation near threshold

Top quark polarization in polarized $e^+e^-$ annihilation near threshold

QCD analysis of light charged Higgs production through polarized top quark decay in two different frames

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e−e+colliders

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Product

Resources

About

Non-universal gauge bosonZ′ and the spin correlation of top quark pair production at e⁻e⁺colliders