Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP04(2019)100
Keywords
Beyond Standard Model; Effective Field Theories; Perturbative QCD
Categories
Funding
- European Union's Horizon 2020 research and innovation programme, Marie Sk lodowska-Curie Innovative Training Network MCnetITN3 [722104]
- F.R.S.-FNRS under the 'Excellence of Science' EOS be.h project [30820817]
- European Research Council [PDF4BSM]
- Netherlands Organization for Scientific Research (NWO)
- European Commission through the Marie Sklodowska-Curie Action ParDHonS FFs.TMDs [752748]
- UK Science and Technology Facility Council [ST/P000630/1]
- Marie Sk lodowska-Curie Individual Fellowship of the European Commission's Horizon 2020 Programme [704187]
- IHEP [Y7515540U1]
- Marie Curie Actions (MSCA) [704187, 752748] Funding Source: Marie Curie Actions (MSCA)
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We present a novel framework for carrying out global analyses of the Standard Model Effective Field Theory (SMEFT) at dimension-six: SMEFiT. This approach is based on the Monte Carlo replica method for deriving a faithful estimate of the experimental and theoretical uncertainties and enables one to construct the probability distribution in the space of the SMEFT degrees of freedom. As a proof of concept of the SMEFiT methodology, we present a first study of the constraints on the SMEFT provided by top quark production measurements from the LHC. Our analysis includes more than 30 independent measurements from 10 different processes at = 8 and 13 TeV such as inclusive ttand single-top production and the associated production of top quarks with weak vector bosons and the Higgs boson. State-of-the-art theoretical calculations are adopted both for the Standard Model and for the SMEFT contributions, where in the latter case NLO QCD corrections are included for the majority of processes. We derive bounds for the 34 degrees of freedom relevant for the interpretation of the LHC top quark data and compare these bounds with previously reported constraints. Our study illustrates the significant potential of LHC precision measurements to constrain physics beyond the Standard Model in a model-independent way, and paves the way towards a global analysis of the SMEFT.
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