CERN Accelerating science

Article
Report number	arXiv:2012.02779 ; KCL-PH-TH/2020-73 ; CERN-TH-2020-202
Title	Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
Author(s)	Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Madigan, Maeve (Cambridge U., DAMTP) ; Mimasu, Ken (King's Coll. London) ; Sanz, Veronica (Valencia U., IFIC ; Sussex U.) ; You, Tevong (CERN ; Cambridge U., DAMTP ; Cambridge U.)
Publication	2021-04-29
Imprint	2020-12-04
Number of pages	80
Note	80 pages, 21 Figures. v3: Extended and clarified discussions, added WZ and ttbar+gamma measurements to the fit and minor typos in predictions fixed. Version accepted for publication in JHEP
In:	JHEP 2104 (2021) 279
DOI	10.1007/JHEP04(2021)279
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	The search for effective field theory deformations of the Standard Model (SM) is a major goal of particle physics that can benefit from a global approach in the framework of the Standard Model Effective Field Theory (SMEFT). For the first time, we include LHC data on top production and differential distributions together with Higgs production and decay rates and Simplified Template Cross-Section (STXS) measurements in a global fit, as well as precision electroweak and diboson measurements from LEP and the LHC, in a global analysis with SMEFT operators of dimension 6 included linearly. We present the constraints on the coefficients of these operators, both individually and when marginalised, in flavour-universal and top-specific scenarios, studying the interplay of these datasets and the correlations they induce in the SMEFT. We then explore the constraints that our linear SMEFT analysis imposes on specific ultra-violet completions of the Standard Model, including those with single additional fields and low-mass stop squarks. We also present a model-independent search for deformations of the SM that contribute to between two and five SMEFT operator coefficients. In no case do we find any significant evidence for physics beyond the SM. Our underlying $\tt{Fitmaker}$ public code provides a framework for future generalisations of our analysis, including a quadratic treatment of dimension-6 operators.
Copyright/License	preprint: (License: CC-BY-4.0) publication: © 2021-2025 The Authors (License: CC-BY-4.0), sponsored by SCOAP³

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