Updated global SMEFT fit to Higgs, diboson and electroweak data

Ellis, John, Murphy, Christopher W, Sanz, Verónica and You, Tevong (2018) Updated global SMEFT fit to Higgs, diboson and electroweak data. Journal of High Energy Physics, 2018 (146). pp. 1-41. ISSN 1029-8479

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Abstract

The ATLAS and CMS collaborations have recently released significant new data on Higgs and diboson production in LHC Run 2. Measurements of Higgs properties have improved in many channels, while kinematic information for h→γγ and h→ZZ can now be more accurately incorporated in fits using the STXS method, and W + W − diboson production at high p T gives new sensitivity to deviations from the Standard Model. We have performed an updated global fit to precision electroweak data, W + W − measurements at LEP, and Higgs and diboson data from Runs 1 and 2 of the LHC in the framework of the Standard Model Effective Field Theory (SMEFT), allowing all coefficients to vary across the combined dataset, and present the results in both the Warsaw and SILH operator bases. We exhibit the improvement in the constraints on operator coefficients provided by the LHC Run 2 data, and discuss the correlations between them. We also explore the constraints our fit results impose on several models of physics beyond the Standard Model, including models that contribute to the operator coefficients at the tree level and stops in the MSSM that contribute via loops.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Theoretical Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 18 Dec 2018 11:29
Last Modified: 02 Jul 2019 13:33
URI: http://sro.sussex.ac.uk/id/eprint/80670

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Project NameSussex Project NumberFunderFunder Ref
STFC GrantUnsetUnsetST/P000258/1
Estonian Research Council via a Mobilitas Pluss grantUnsetUnsetUnset
South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2017-2020 - Sussex nodeG2074STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000819/1
United States Department of Energy under Grant ContractUnsetUnsetUnset
STFC consolidated grantUnsetUnsetST/P000681/1
Junior Research Fellowship from GonvilleUnsetUnsetUnset