Automated one-loop computations in the SMEFT

Degrande, Céline; Durieux, Gauthier; Maltoni, Fabio; Mimasu, Ken; Vryonidou, Eleni; Zhang, Cen

doi:10.48550/arxiv.2008.11743

Cited by 15 publications

(19 citation statements)

References 47 publications

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“…[10] which include matching, merging and parton showering. Predictions for the operator Q G , which are not present in the ATLAS reference, are added using the SMEFT@NLO model [128]. For all other channels, we cannot use the ATLAS predictions due to different scheme choices and instead rely on the predictions at parton level generated with MadGraph.…”

Section: Di-higgsmentioning

confidence: 99%

Effective limits on single scalar extensions in the light of recent LHC data

Anisha¹,

Bakshi²,

Banerjee³

et al. 2021

Preprint

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In this paper, we work with 16 different single scalar particle extensions of the Standard Model. For the first time, we present the exhaustive sets of dimension-6 effective operators and the associated Wilson coefficients as functions of model parameters after integrating out the heavy scalars up to 1-loop, including the light-heavy mixing, for each such scenario. Using the correspondence between the effective operators and the observables at electroweak scale, and employing Bayesian statistics, we compute the allowed ranges of new physics parameters that are further translated and depicted in 2-dimensional Wilson coefficient space in the light of the latest CMS and ATLAS data up to 137 fb −1 and 139 fb −1 , respectively. We also adjudge the status of those new physics extensions that offer similar sets of relevant effective operators. In addition, we provide a model-independent fit of 23 Standard Model effective field theory Wilson coefficients using electroweak precision observables, single and di-Higgs data as well as kinematic distributions of di-boson production.

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Section: Di-higgsmentioning

confidence: 99%

Effective limits on single scalar extensions in the light of recent LHC data

Anisha¹,

Bakshi²,

Banerjee³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The effect of including the SMEFT self-interference diagrams can often introduce a marked effect on the bounds obtained for a given SMEFT scenario [17,41]. Moreover, with the impetus to produce high precision theoretical predictions for the LHC era, the inclusion of higher order corrections in the SMEFT scattering graphs are becoming particularly pertinent [42][43][44][45]. Such considerations introduce a non-linear dependence on the Wilson coefficients in the space of observables: quadratic in the former and quadratic in the highest order in the QCD expansion in the latter.…”

Section: Incorporating Non-linear Effectsmentioning

confidence: 99%

A new generation of simultaneous fits to LHC data using deep learning

Iranipour,

Ubiali

2022

Preprint

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We present a new methodology that is able to yield a simultaneous determination of the Parton Distribution Functions (PDFs) of the proton alongside any set of parameters that determine the theory predictions; whether within the Standard Model (SM) or beyond it. The SIMUnet methodology is based on an extension of the NNPDF4.0 neural network architecture, which allows the addition of an extra layer to simultaneously determine PDFs alongside an arbitrary number of such parameters. We illustrate its capabilities by simultaneously fitting PDFs with a subset of Wilson coefficients within the Standard Model Effective Field Theory framework and show how the methodology extends naturally to larger subsets of Wilson coefficients and to other SM precision parameters, such as the strong coupling constant or the heavy quark masses.

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“…The VBF productions are simulated using MadGraph5 aMC@NLO [38]. We make use of the SMEFT UFO model [39] to implement the dim-6 SMEFT operators and allow the decays of the gauge bosons and the Higgs boson.…”

Section: The Numerical Simulation and Analysis Of The 2 → 3 Vbs At Mu...mentioning

confidence: 99%

Measurement of Higgs boson self-couplings through $2\rightarrow 3$ vector bosons scattering in future muon colliders

Chen,

Li,

et al. 2021

Preprint

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The 2 → 3 scattering of longitudinal vector bosons (VBS) has been proved to be complementary channel to measure the Higgs self-couplings in the Standard Model (SM) and the SM effective field theory (SMEFT) at colliders. We perform the first comprehensive study of all main 2 → 3 VBS processes at high-energy muon colliders, especially including background analysis. The main contributing channels turn out to be the scattering of W + W − → W + W − h, ZZh and hhh. We obtain the constraints on c 6 and c Φ 1 which are the Wilson coefficients of the dimension-6 operators relevant for Higgs self-couplings in the SMEFT. After combining the significance of all three VBS channels, with the center-of-mass energies of 10 TeV and 30 TeV, we find the expected sensitivity to the coefficients c 6 /Λ 2 and c Φ 1 /Λ 2 can reach the level of 0.01 TeV −2 . The tightest constraints come from the hhh channel, while the constraints from W W h are also comparable. Our results crucially depend on selecting the longitudinal polarizations for the final W and Z bosons. We then study how the sensitivities change by varying the efficiency of tagging longitudinal polarizations, and find that the significance remains consistently high.

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Automated one-loop computations in the SMEFT

Cited by 15 publications

References 47 publications

Effective limits on single scalar extensions in the light of recent LHC data

Effective limits on single scalar extensions in the light of recent LHC data

A new generation of simultaneous fits to LHC data using deep learning

Measurement of Higgs boson self-couplings through $2\rightarrow 3$ vector bosons scattering in future muon colliders

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