Pinning down electroweak dipole operators of the top quark

Schulze, Markus; Soreq, Yotam

doi:10.1140/epjc/s10052-016-4263-x

Cited by 68 publications

(71 citation statements)

References 82 publications

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“…[52]). The complementarity between A C in tt and ttγ to probe the presence of new physics contributions was already highlighted in ref.…”

Section: Discussionmentioning

confidence: 99%

Single lepton charge asymmetries in $$t {\bar{t}}$$ t t ¯ and

Aguilar-Saavedra

2018

Eur. Phys. J. C

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We discuss lepton charge asymmetries in tt and ttγ production at the LHC, which can be measured in the semileptonic decay channel tt → W + b W −b → + νb qq b (or the charge conjugate). Considering several variants of a new physics scenario with a light colour octet, it is seen that for tt these asymmetries may have a sensitivity competitive with the dilepton asymmetry already measured. For ttγ the new leptonic asymmetries, as well as the tt charge asymmetry, will reach their full potential with the high luminosity LHC upgrade. These asymmetries can pinpoint deviations at the 3σ −4σ level for new physics scenarios where the charge asymmetries already measured in tt production agree within 1σ .

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“…[52]). The complementarity between A C in tt and ttγ to probe the presence of new physics contributions was already highlighted in ref.…”

Section: Discussionmentioning

confidence: 99%

Single lepton charge asymmetries in $$t {\bar{t}}$$ t t ¯ and

Aguilar-Saavedra

2018

Eur. Phys. J. C

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“…Rows two and three of the table show the result of our simulations described in the pre- to predictions in the literature, from fast-simulation studies in the context of the TESLA TDR [81], and from studies on the prospects at the (high-luminosity) LHC [5,[82][83][84], on the potential of a 100 TeV proton collider [85], and of the LHeC electron-proton collider [86] Collider CLIC and the initial 500 GeV run at the International Linear Collider. In both cases an integrated luminosity of 500 fb −1 is assumed.…”

Section: Prospects For Cp-violating Form Factorsmentioning

confidence: 99%

CP-violating top quark couplings at future linear $$e^+e^-$$ e + e - colliders

et al. 2018

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We study the potential of future lepton colliders to probe violation of the CP symmetry in the top quark sector. In certain extensions of the Standard Model, such as the two-Higgs-doublet model (2HDM), sizeable anomalous top quark dipole moments can arise, which may be revealed by a precise measurement of top quark pair production. We present results from detailed Monte Carlo studies for the ILC at 500 GeV and CLIC at 380 GeV and use parton-level simulations to explore the potential of high-energy operation. We find that precise measurements in e + e − → tt production with subsequent decay to lepton plus jets final states can provide sufficient sensitivity to detect Higgs-boson-induced CP violation in a viable two-Higgs-doublet model. The potential of a linear e + e − collider to detect CP-violating electric and weak dipole form factors of the top quark exceeds the prospects of the HL-LHC by over an order of magnitude.

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“…Refs. [6][7][8][9][10][11][12] for a representative sample as well as [13] for a discussion of electroweak precision effects), and a similar effort is well under way in Higgs physics, where the associated limits on Wilson coefficients are typically statistics limited. Still, despite the impressive statistical sample of top quark data that enters these fits, the subsequent direct bounds on the operator coefficients, and, by extension, the scale of new physics that would generate those operators, are rather weak [7].…”

Section: Introductionmentioning

confidence: 99%

Top quark electroweak couplings at future lepton colliders

Englert

Russell

2017

Eur. Phys. J. C

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We perform a comparative study of the reach of future e + e − collider options for the scale of non-resonant new physics effects in the top quark sector, phrased in the language of higher-dimensional operators. Our focus is on the electroweak top quark pair production process e + e − → Z * /γ → tt, and we study benchmark scenarios at the ILC and CLIC. We find that both are able to constrain mass scales up to the few TeV range in the most sensitive cases, improving by orders of magnitude on the forecast capabilities of the LHC. We discuss the role played by observables such as forward-backward asymmetries, and making use of different beam polarisation settings, and highlight the possibility of lifting a degeneracy in the allowed parameter space by combining top observables with precision Z -pole measurements from LEP1.

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Pinning down electroweak dipole operators of the top quark

Cited by 68 publications

References 82 publications

Single lepton charge asymmetries in $$t {\bar{t}}$$ t t ¯ and

Single lepton charge asymmetries in $$t {\bar{t}}$$ t t ¯ and

CP-violating top quark couplings at future linear $$e^+e^-$$ e + e - colliders

Top quark electroweak couplings at future lepton colliders

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