Abstract
We perform an up-to-date global fit of top quark effective theory to experimental data from the Tevatron, and from LHC Runs I and II. Experimental data includes total cross-sections up to 13 TeV, as well as differential distributions, for both single top and pair production. We also include the top quark width, charge asymmetries, and polarisation information from top decay products. We present bounds on the coefficients of dimension six operators, and examine the interplay between inclusive and differential measurements, and Tevatron / LHC data. All results are currently in good agreement with the Standard Model.
Highlights
Mass [1, 2] from the Standard Model fields.1 If this is true, the new physics can be modelled by an infinite series of higher-dimensional effective operators [4,5,6,7]
We present bounds on the coefficients of dimension six operators, and examine the interplay between inclusive and differential measurements, and Tevatron/LHC data
The new physics can be modelled by an infinite series of higher-dimensional effective operators [4,5,6,7]
Summary
Mass [1, 2] from the Standard Model fields. If this is true, the new physics can be modelled by an infinite series of higher-dimensional effective operators [4,5,6,7]. These have the advantage over simple signal strengths in that they can accommodate differential measurements and angular observables, since the operators lead to new vertex structures which modify event kinematics They are preferable to anomalous couplings since they preserve the Standard Model SU(3)C × SU(2)L × U(1)Y gauge symmetry, so can more be linked to ultraviolet completions than arbitrary form factors. These merits have not gone unnoticed, as effective field theory (EFT) techniques have received much attention in interpreting available Higgs results [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25].
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