2020/12/31 by John Ellis, Maeve Madigan, Ken Mimasu +2 · 1 citation
Computer Science · Physics and Astronomy · Social Sciences · #Computational Physics and Python Applications #Effective field theory #Electroweak interaction #Extra dimensions #Field (mathematics) #Higgs boson #International Science and Diplomacy #Large Hadron Collider #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quadratic equation #Standard Model (mathematical formulation) #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep04(2021)279
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
openalex created_date 2020/12/21 · openalex publication_date 2021/04/01 · arxiv created 2021/04/08 · arxiv updated 2021/05/19 · openalex updated_date 2026/08/06
A bstract 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 Fitmaker public code provides a framework for future generalisations of our analysis, including a quadratic treatment of dimension-6 operators.