EFTfitter: a tool for interpreting measurements in the context of effective field theories

Castro, N. F.; Erdmann, J.; Grunwald, Cornelius; Kroeninger, K.; Rosien, N.-A.

doi:10.1140/epjc/s10052-016-4280-9

Cited by 45 publications

(44 citation statements)

References 34 publications

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“…4 to constrain the Wilson coefficientsC uB ,C uG andC uW . We use a new implementation of the EFTfitter tool [75] based on the Bayesian Analysis Toolkit -BAT.jl [76,77]. This allows to perform fits of Wilson coefficients in a Bayesian reasoning, yielding (marginalized) posterior probability distributions of the parameters.…”

Section: Constraining Wilson Coefficientsmentioning

confidence: 99%

Constraining top-quark couplings combining top-quark and $$\varvec{B}$$ decay observables

et al. 2020

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We present a first, consistent combination of measurements from top-quark and B physics to constrain topquark properties within the Standard Model Effective Field Theory (SMEFT). We demonstrate the feasibility and benefits of this approach and detail the ingredients required for a proper combination of observables from different energy scales. Specifically, we employ measurements of the ttγ cross section together with measurements of theB → X s γ branching fraction to test the Standard Model and look for new physics contributions to the couplings of the top quark to the gauge bosons within SMEFT. We perform fits of three Wilson coefficients of dimension-six operators considering only the individual observables as well as their combination to demonstrate how the complementarity between top-quark and B physics observables allows to resolve ambiguities and significantly improves the constraints on the Wilson coefficients. No significant deviation from the Standard Model is found with present data.

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Section: Constraining Wilson Coefficientsmentioning

confidence: 99%

Constraining top-quark couplings combining top-quark and $$\varvec{B}$$ decay observables

et al. 2020

Self Cite

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“…In this context, the wealth of precision measurements presented by the LHC collaborations in recent years, together with the significant progress in the corresponding theoretical calculations and modelling of collider processes, has motivated many groups to pursue (partial) SMEFT analyses of the LHC data [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] complemented often with input from lower-energy experiments such as the LEP electroweak precision tests. In these fits, constraints on the SMEFT operators can be provided not only by "traditional" processes such as electroweak gauge boson and Higgs production, but also by other high-p T processes such as jet and top quark production.…”

mentioning

confidence: 99%

A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector

Hartland

Maltoni

Nocera

et al. 2019

J. High Energ. Phys.

198

251

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We present a novel framework for carrying out global analyses of the Standard Model Effective Field Theory (SMEFT) at dimension-six: SMEFiT. This approach is based on the Monte Carlo replica method for deriving a faithful estimate of the experimental and theoretical uncertainties and enables one to construct the probability distribution in the space of the SMEFT degrees of freedom. As a proof of concept of the SMEFiT methodology, we present a first study of the constraints on the SMEFT provided by top quark production measurements from the LHC. Our analysis includes more than 30 independent measurements from 10 different processes at √ s = 8 and 13 TeV such as inclusive tt and single-top production and the associated production of top quarks with weak vector bosons and the Higgs boson. State-of-the-art theoretical calculations are adopted both for the Standard Model and for the SMEFT contributions, where in the latter case NLO QCD corrections are included for the majority of processes. We derive bounds for the 34 degrees of freedom relevant for the interpretation of the LHC top quark data and compare these bounds with previously reported constraints. Our study illustrates the significant potential of LHC precision measurements to constrain physics beyond the Standard Model in a model-independent way, and paves the way towards a global analysis of the SMEFT.

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“…In the end we note that while the imaginary parts of anomalous tensorial couplings are most severely constrained by EDM's of neutron and electron, BR(b → sγ) constrains |g L | and W -helicity fraction from the collider data constrain the |g R | most effectively. Recentl global fits to the LHC and Tevatron data [87][88][89][90][91] and the limits on g R are not very strong.…”

Section: Constraint Limitsmentioning

confidence: 99%

Probing anomalous Wtb couplings at the LHC in single t -channel top quark production

Jueid

2018

Phys. Rev. D

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We study the sensitivity of certain observables to the anomalous right tensorial coupling in single top production at the LHC at √ s = 13 TeV. The observables consist of asymmetries constructed from the energy and angles of the decay products of the top quark produced in single top production through t-channel. The computation is done at Leading Order (LO) and Next-to-Leading Order (NLO) in the strong coupling in the 5 flavor scheme. We have estimated projected limits on the anomalous coupling, both at the parton level without cuts and at the particle level with cuts. We find that the asymmetries are robust with respect to the higher order QCD corrections and are indeed a very good probe of this anomalous coupling of the top. Hence they can be be used as experimental probes of the same.

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EFTfitter: a tool for interpreting measurements in the context of effective field theories

Cited by 45 publications

References 34 publications

Constraining top-quark couplings combining top-quark and $$\varvec{B}$$ decay observables

Constraining top-quark couplings combining top-quark and $$\varvec{B}$$ decay observables

A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector

Probing anomalous Wtb couplings at the LHC in single t -channel top quark production

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