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

Basan, A.; Berta, P.; Masetti, L.; Vryonidou, Eleni; Westhoff, Susanne

doi:10.1007/jhep03(2020)184

Cited by 10 publications

(14 citation statements)

References 45 publications

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“…This allows us to distinguish between the two flavor contractions A and A by combining symmetric and antisymmetric top-antitop observables [43,78]. Kinematic distributions with boosted tops and/or an additional jet in the final state are also sensitive to the relative impact of color-singlet and color-octet coefficients [43,79,80].…”

Section: Four-quark Operatorsmentioning

confidence: 99%

The flavor of UV physics

Bruggisser

Schäfer

Dyk

et al. 2021

J. High Energ. Phys.

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New physics not far above the TeV scale should leave a pattern of virtual effects in observables at lower energies. What do these effects tell us about the flavor structure of a UV theory? Within the framework of the Standard Model Effective Field Theory (SMEFT), we resolve the flavor structure of the Wilson coefficients in a combined analysis of top-quark and B-physics observables. We assume that the Yukawa couplings are the only sources of flavor symmetry breaking, a framework known as Minimal Flavor Violation. Our fits to LHC and b-factory measurements show that combining top and bottom observables is crucial to pin down possible sources of flavor breaking in a UV theory. This analysis includes the full analytic expansion of SMEFT coefficients in Minimal Flavor Violation and a detailed study of SMEFT effects in b → s flavor transitions.

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Section: Four-quark Operatorsmentioning

confidence: 99%

The flavor of UV physics

Bruggisser

Schäfer

Dyk

et al. 2021

J. High Energ. Phys.

Self Cite

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“…Moreover, it is expected that another LHC experiment, the LHCb, will be able to observe a non-zero tt charge asymmetry at the high-luminosity LHC [121]. Additionally, there is a possibility to measure different types of asymmetries, such as energy asymmetry between the top and antitop quarks [122].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Charge Asymmetry in Top Quark Pair Production

Lysák

2020

Symmetry

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The top quark is the heaviest elementary particle known. It has been proposed many times that new physics beyond the current theory of elementary particles may reveal itself in top quark interactions. The charge asymmetry in the pair production of a fermion and its antiparticle has been known for many decades. Early measurements of such asymmetry in top quark pair production showed a disagreement with the prediction by more than 3 standard deviations. Many years of an effort on both experimental and theoretical side have allowed to understand the top quark pair charge asymmetry better and to bring back the agreement between the measurements and the theory. In this article, these efforts are reviewed together with the discussion about a potential future of such measurements.

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“…To provide a constraint on these additional degrees of freedom, the inclusive pp → t t cross-section measurement from the Tevatron experiments [65] and the pp → t t cross-section at 13 TeV [66] are included in this extended fit. In order to perform a competitive global fit on these additional degrees of freedom we should include more observables, like differential measurements of pp → t t, the t t charge asymmetry [67] or the top energy asymmetry [68]. The purpose of this analysis is just to see the degradation of our limits due to extending the basis, not to find a competitive constraint on C tG and/or the four-fermion operators.…”

Section: Limitations Of the Basismentioning

confidence: 99%

The top quark electro-weak couplings after LHC Run 2

Miralles

López

Llácer

et al. 2022

J. High Energ. Phys.

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Recent measurements at the Large Hadron Collider allow for a robust and precise characterisation of the electro-weak interactions of the top quark. We present the results of a global analysis at next-to-leading order precision including LHC, LEP/SLD and Tevatron data in the framework of the Standard Model Effective Field Theory. We include a careful analysis of the impact of correlations among measurements, as well as of the uncertainties in the Effective Field Theory setup itself. We find remarkably robust global fit results, with central values in good agreement with the Standard Model prediction, and 95% probability bounds on Wilson coefficients that range from ±0.35 to ±8 TeV−2. This result represents a considerable improvement over previous studies, thanks to the addition of differential cross-section measurements in associated production processes of top quarks and neutral gauge bosons.

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

Cited by 10 publications

References 45 publications

The flavor of UV physics

The flavor of UV physics

Charge Asymmetry in Top Quark Pair Production

The top quark electro-weak couplings after LHC Run 2

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