Constraining anomalous top quark couplings at the Fermilab Tevatron

Atwood, David; Kagan, Alex; Rizzo, T. G.

doi:10.1103/physrevd.52.6264

Cited by 107 publications

(127 citation statements)

References 28 publications

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“…The cross section induced by the top chromomagnetic and chromoelectric dipole moments was computed in refs. [144,145], and we consider here terms that are at most quadratic ind t . The SM tt cross section is known at N 2 LO accuracy [146].…”

Section: Jhep02(2016)011mentioning

confidence: 99%

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Chien

Cirigliano

Dekens

et al. 2016

J. High Energ. Phys.

117

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Abstract:We investigate direct and indirect constraints on the complete set of anomalous CP-violating Higgs couplings to quarks and gluons originating from dimension-6 operators, by studying their signatures at the LHC and in electric dipole moments (EDMs). We show that existing uncertainties in hadronic and nuclear matrix elements have a significant impact on the interpretation of EDM experiments, and we quantify the improvements needed to fully exploit the power of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs interactions come from a combination of EDM measurements and the data from LHC Run 1. We argue that Higgs production cross section and branching ratios measurements at the LHC Run 2 will not improve the constraints significantly. On the other hand, the bounds on the couplings scale roughly linearly with EDM limits, so that future theoretical and experimental EDM developments can have a major impact in pinning down interactions of the Higgs.

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Section: Jhep02(2016)011mentioning

confidence: 99%

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Chien

Cirigliano

Dekens

et al. 2016

J. High Energ. Phys.

117

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“…m t will be taken to be 175 GeV in the numerical discussion below. The corresponding cross section for gg → tt is somewhat lengthy 4 and not very enlightening except for the fact that it is quartic in κ. Both of these cross section expressions have also been generalized 4 to allow for a CP -violating anomalous chromoelectric moment,κ which can appear in cross section expressions in even powers only since cross sections are not CP -violating observables.…”

Section: Dimension-six Operators and Chromomagnetic Momentsmentioning

confidence: 99%

Top Quark Production at the Tevatron: Probing Anomalous Chromomagnetic Moments and Theories of Low Scale Gravity

Rizzo¹

1999

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We review the effects of an anomalous chromomagnetic moment on top quark pair production at the Tevatron for Run II. Apart from an overall rescaling by the total cross section these couplings have little influence on top production characteristics. We then examine how the exchange of a Kaluza-Klein tower of gravitons arising from the low scale quantum gravity scenario of Arkani-Hamed, Dimopoulos and Dvali influences top pair cross sections and several associated kinematical distributions. The data that will be available with Run II luminosities is shown to be sensitive to values of the effective Planck scale of order 1 TeV or more. We review the effects of an anomalous chromomagnetic moment on top quark pair production at the Tevatron for Run II. Apart from an overall rescaling by the total cross section these couplings have little influence on top production characteristics. We then examine how the exchange of a Kaluza-Klein tower of gravitons arising from the low scale quantum gravity scenario of ArkaniHamed, Dimopoulos and Dvali influences top pair cross sections and several associated kinematical distributions. The data that will be available with Run II luminosities is shown to be sensitive to values of the effective Planck scale of order 1 TeV or more.

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“…The chromo-magnetic operator m t G a µνt σ µν λ a t also interferes with the SM qq → tt production amplitude, and can affect the tt production rate [62], but does not contribute to the asymmetry and thus we do not consider it further.…”

Section: Contact Operatorsmentioning

confidence: 99%

AFBtmeets LHC

et al. 2011

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The recent Tevatron measurement of the forward-backward asymmetry of the top quark shows an intriguing discrepancy with Standard Model expectations, particularly at large tt invariant masses.Measurements of this quantity are subtle at the LHC, due to its pp initial state, however, one can define a forward-central-charge asymmetry which captures the physics. We study the capability of the LHC to measure this asymmetry and find that within the SM a measurement at the 5σ level is possible with roughly 60 fb −1 at √ s = 14 TeV. If nature realizes a model which enhances the asymmetry (as is necessary to explain the Tevatron measurements), a significant difference from zero can be observed much earlier, perhaps even during early LHC running at √ s = 7 TeV. We further explore the capabilities of the 7 TeV LHC to discover resonances or contact interactions which modify the tt invariant mass distribution using recent boosted top tagging techniques. We find that TeV-scale color octet resonances can be discovered, even with small coupling strengths and that contact interactions can be probed at scales exceeding 6 TeV. Overall, the LHC has good potential to clarify the situation with regards to the Tevatron forward-backward measurement.

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Constraining anomalous top quark couplings at the Fermilab Tevatron

Cited by 107 publications

References 28 publications

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Top Quark Production at the Tevatron: Probing Anomalous Chromomagnetic Moments and Theories of Low Scale Gravity

AFBtmeets LHC

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