Combined SMEFT interpretation of Higgs, diboson, and top quark data from the LHC

Abstract

We present a global interpretation of Higgs, diboson, and top quark production and decay measurements from the LHC in the framework of the Standard Model Effective Field Theory (SMEFT) at dimension six. We constrain simultaneously 36 independent directions in its parameter space, and compare the outcome of the global analysis with that from individual and two-parameter fits. Our results are obtained by means of state-of-the-art theoretical calculations for the SM and the EFT cross-sections, and account for both linear and quadratic corrections in the $1/{\Lambda }^2$ expansion. We demonstrate how the inclusion of NLO QCD and $\mathcal{O}\left({\Lambda }^{-4}\right)$ effects is instrumental to accurately map the posterior distributions associated to the fitted Wilson coefficients. We assess the interplay and complementarity between the top quark, Higgs, and diboson measurements, deploy a variety of statistical estimators to quantify the impact of each dataset in the parameter space, and carry out fits in BSM-inspired scenarios such as the top-philic model. Our results represent a stepping stone in the ongoing program of model-independent searches at the LHC from precision measurements, and pave the way towards yet more global SMEFT interpretations extended to other high-$p_T$ processes as well as to low-energy observables.

93 pages, 31 figures, results available from https://lhcfitnikhef.github.io/SMEFT/. v2: updated results. v3: version accepted for publication in JHEP. This paper is dedicated to the memory of our friend and collaborator Cen Zhang

References in corpus (20)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Compilation of low-energy constraints on 4-fermion operators in the SMEFT
• Automated one-loop computations in the SMEFT
• Effective four-fermion operators in top physics: a roadmap
• Measurements of $WH$ and $ZH$ production in the $H\to b\bar{b}$ decay channel in $pp$ collisions at 13 TeV with the ATLAS detector
• Measurement of the $t\bar{t}Z$ and $t\bar{t}W$ cross sections in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Evidence for $t\bar{t}t\bar{t}$ production in the multilepton final state in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
• Disguising the Oblique Parameters
• Validity of SMEFT studies of VH and VV Production at NLO
• SMEFT analysis of vector boson scattering and diboson data from the LHC Run II
• Reactor neutrino oscillations as constraints on Effective Field Theory
• Measurements of the pp $\to$ WZ inclusive and differential production cross section and constraints on charged anomalous triple gauge couplings at $\sqrt{s}=$ 13 TeV
• Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at $\sqrt{s}=$ 13 TeV
• Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson at $\sqrt{s}=13$ TeV with the ATLAS detector
• Observation of the associated production of a top quark and a $Z$ boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of $VH$, $H\to b\bar{b}$ production as a function of the vector-boson transverse momentum in 13 TeV $pp$ collisions with the ATLAS detector
• Measurement of differential $\mathrm{t}\bar{\mathrm{t}}$ production cross sections using top quarks at large transverse momenta in pp collisions at $\sqrt{s}=$ 13 TeV
• Measurement of single top-quark production in association with a $W$ boson in the single-lepton channel at $\sqrt{s}=8$ TeV with the ATLAS detector
• Parton distribution functions
• Using associated top quark production to probe for new physics within the framework of effective field theory

Cited by in corpus (14)

• 50 Years of Quantum Chromodynamics
• Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
• Natural Selection Rules: New Positivity Bounds for Massive Spinning Particles
• Positivity bounds in the Standard Model effective field theory beyond tree level
• The top quark electro-weak couplings after LHC Run 2
• Tree boosting for learning EFT parameters
• Improved Constraints on Effective Top Quark Interactions using Edge Convolution Networks
• Measurement of the energy asymmetry in $t\bar{t}j$ production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework
• Precision QCD Physics at the LHC
• From the EFT to the UV: the complete SMEFT one-loop dictionary
• Top quark effective couplings from top-pair tagged photoproduction in $p{e}^{-}$ collisions
• Directly Probing the Higgs-top Coupling at High Scales
• SMEFT Constraints on New Physics Beyond the Standard Model
• Searches for new interactions within the SMEFT framework at present and future colliders