SMEFTsim 3.0 -- a practical guide

Brivio, Ilaria

doi:10.48550/arxiv.2012.11343

Cited by 3 publications

(3 citation statements)

References 84 publications

(142 reference statements)

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“…In this appendix, we provide further details about the calculation and validation of these EFT K-factors. Specifically, we compare the numerical values for these K-factors, which have been obtained using SMEFTsim [82,148] interfaced with MadGraph5 aMC@NLO, with the analytic calculation presented in [27].…”

Section: Validation Of the Smeft K-factorsmentioning

confidence: 99%

Parton distributions in the SMEFT from high-energy Drell-Yan tails

Greljo,

Iranipour,

Kassabov

et al. 2021

Preprint

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The high-energy tails of charged-and neutral-current Drell-Yan processes provide important constraints on the light quark and anti-quark parton distribution functions (PDFs) in the large-x region. At the same time, short-distance new physics effects such as those encoded by the Standard Model Effective Field Theory (SMEFT) would induce smooth distortions to the same high-energy Drell-Yan tails. In this work, we assess for the first time the interplay between PDFs and EFT effects for high-mass Drell-Yan processes at the LHC and quantify the impact that the consistent joint determination of PDFs and Wilson coefficients has on the bounds derived for the latter. We consider two well-motivated new physics scenarios: 1) electroweak oblique corrections ( Ŵ , Ŷ ) and 2) four-fermion interactions potentially related to the LHCb anomalies in R(K ( * ) ). We account for available Drell-Yan data, both from unfolded cross sections and from searches, and carry out dedicated projections for the High-Luminosity LHC. Our main finding is that, while the interplay between PDFs and EFT effects remains moderate for the current dataset, it will become a significant challenge for EFT analyses at the HL-LHC.

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Section: Validation Of the Smeft K-factorsmentioning

confidence: 99%

Parton distributions in the SMEFT from high-energy Drell-Yan tails

Greljo,

Iranipour,

Kassabov

et al. 2021

Preprint

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“…SM Higgs cross-sections are taken from the LHC Higgs WG [54], while LHC electroweak processes are computed using Sherpa2.2.2 [55], Herwig7.1.5 [56], and VBFNLO3.0.0 [57] at NLO, matched to Sherpa and Pythia8 [58] parton showers respectively. Linear EFT cross-sections are computed with MadGraph5 aMC@NLO [59] and SMEFTsim [60,61], except for loop-induced processes in the SM such as gg → h and gg → Zh where SMEFT@NLO [18] is used for the calculation of NLO QCD effects. An analytical computation with NLO accuracy in QED [62] is used for H → γγ.…”

Section: Detailsmentioning

confidence: 99%

SMEFiT: a flexible toolbox for global interpretations of particle physics data with effective field theories

Giani¹,

Magni²,

Rojo³

2023

Preprint

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The Standard Model Effective Field Theory (SMEFT) provides a robust framework to interpret experimental measurements in the context of new physics scenarios while minimising assumptions on the nature of the underlying UV-complete theory. We present the Python open source SMEFiT framework, designed to carry out parameter inference in the SMEFT within a global analysis of particle physics data. SMEFiT is suitable for inference problems involving a large number of EFT degrees of freedom, without restrictions on their functional dependence in the fitted observables, can include UV-inspired restrictions in the parameter space, and implements arbitrary rotations between operator bases. Posterior distributions are determined from two complementary approaches, Nested Sampling and Monte Carlo optimisation. SMEFiT is released together with documentation, tutorials, and post-analysis reporting tools, and can be used to carry out state-of-the-art EFT fits of Higgs, top quark, and electroweak production data. To illustrate its functionalities, we reproduce the results of the recent ATLAS EFT interpretation of Higgs and electroweak data from Run II and demonstrate how equivalent results are obtained in two different operator bases.

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“…To explore the heavy NP in the muon g − 2 at µp − 1 and µp − 2, we perform truth-level Monte Carlo simulations with the event generator MadGraph5 and the model package SMEFTsim [67,68], with the parton-level cuts p j T > 5 GeV and |η j | < 5.5. The computed cross sections for the signal and background processes are given in Table IV, assuming the contributions arise solely from the single SMEFT operator C µc T .…”

Section: Introduction the Large Hadron Collider (Lhc) Inmentioning

confidence: 99%

Physics potential of a muon-proton collider

Cheung,

Wang

2021

Preprint

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We propose a muon-proton collider with asymmetrical multi-TeV beam energies and integrated luminosities of 0.1 − 1 ab −1 . With its large center-of-mass energies and yet small Standard Model background, such a machine can not only improve electroweak precision measurements but also probe new physics beyond the Standard Model to an unprecedented level. We study its potential in measuring the Higgs properties, probing the R-parity-violating Supersymmetry, as well as testing heavy new physics in the muon g − 2 anomaly. We find that for these physics cases the muon-proton collider can perform better than both the ongoing and future high-energy collider experiments.

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SMEFTsim 3.0 -- a practical guide

Cited by 3 publications

References 84 publications

Parton distributions in the SMEFT from high-energy Drell-Yan tails

Parton distributions in the SMEFT from high-energy Drell-Yan tails

SMEFiT: a flexible toolbox for global interpretations of particle physics data with effective field theories

Physics potential of a muon-proton collider

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