Top quark charge asymmetry: searching for light axigluons in t t ¯ $$ t\overline{t} $$ + jet production at the LHC

Alte, Stefan; Berge, Stefan; Spiesberger, H.

doi:10.1007/jhep09(2014)084

Cited by 9 publications

(13 citation statements)

References 92 publications

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“…In these processes, lepton asymmetries can be measured as well, providing extra independent probes on new physics effects. Charge asymmetries in tt j have also been proposed [38,39]. In this work we focus on two single lepton asymmetries in ttγ production, A t C and A C , which are the analogue to the ones defined for tt production, and study their sensitivity.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

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

Aguilar-Saavedra

2018

Eur. Phys. J. C

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“…Beyond the Standard Model, ttj production is known to be sensitive to chiral topquark interactions [10,[24][25][26][27][28]. We present the first full analysis of SMEFT contributions to ttj production, analyzing both charge-symmetric and charge-asymmetric observables.…”

Section: Jhep03(2020)184mentioning

confidence: 99%

“…Due to the partonic boost of the incoming quark, the jet distribution in this process is asymmetric. To reflect this feature, we define an optimized energy asymmetry as [23,28] A opt E (θ j ) = σ A (θ j , y ttj > 0) + σ A (π − θ j , y ttj < 0) σ ttj (θ j , y ttj > 0) + σ ttj (π − θ j , y ttj < 0) = σ opt A (θ j ) σ opt S (θ j )…”

Section: Jhep03(2020)184mentioning

confidence: 99%

“…Our analysis of the energy asymmetry in the Standard Model predicts that it can be measured at the LHC with less than 50 % uncertainty already with the present data set from Run 2, see table 2. Given that ttj observables have a high theoretical sensitivity to new top interactions [25,26,28], even a loose measurement of the energy asymmetry will provide us with interesting information about new physics at high scales. To provide a model-independent theoretical framework for new-physics interpretations of a future measurement, we perform a detailed analysis of the energy asymmetry in SMEFT.…”

Section: Jhep03(2020)184 3 Energy Asymmetry In the Standard Model Effmentioning

confidence: 99%

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Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations

Basan

Berta

Masetti

et al. 2020

J. High Energ. Phys.

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The energy asymmetry in top-antitop-jet production is an observable of the top charge asymmetry designed for the LHC. We perform a realistic analysis in the boosted kinematic regime, including effects of the parton shower, hadronization and expected experimental uncertainties. Our predictions at particle level show that the energy asymmetry in the Standard Model can be measured with a significance of 3σ during Run 3, and with more than 5σ significance at the HL-LHC. Beyond the Standard Model the energy asymmetry is a sensitive probe of new physics with couplings to top quarks. In the framework of the Standard Model Effective Field Theory, we show that the sensitivity of the energy asymmetry to effective four-quark interactions is higher or comparable to other top observables and resolves blind directions in current LHC fits. We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector.

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“…We quantify this boost in terms of the rapidity of the top-antitop-jet CM frame, y ttj , which at the LO is connected with the proton momentum fractions of p 1 and p 2 via y ttj = ln(x 1 /x 2 )/2. This allows us to define an optimized energy asymmetry as [21] A opt…”

Section: Observables Of the Charge Asymmetrymentioning

confidence: 99%

Observing the top energy asymmetry at the LHC

Berge

Westhoff

2017

Phys. Rev. D

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The top-antitop energy asymmetry is a promising observable of the charge asymmetry in jet-associated top-quark pair production at the LHC. We present new predictions of the energy asymmetry in proton-proton collisions at 13 TeV, including QCD corrections at the next-to-leading perturbative order. The effect of QCD corrections on the observable is moderate. With suitable phase-space cuts, the asymmetry can be enhanced at the cost of reducing the cross section. For instance, for a cross section of 1 pb after cuts, we predict an energy asymmetry of −6.5 +0.1 −0.2 % at the next-to-leading order in QCD. We also investigate scale uncertainties and parton-shower effects, which partially cancel in the normalized asymmetry. Our results provide a sound basis for a measurement of the energy asymmetry at the LHC during run II.

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Top quark charge asymmetry: searching for light axigluons in t t ¯ $$ t\overline{t} $$ + jet production at the LHC

Cited by 9 publications

References 92 publications

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

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

Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations

Observing the top energy asymmetry at the LHC

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