Abstract
Abstract:
Previous studies have shown that weighted angular moments derived from jet constituents
encode the colour connections between partons that seed the jets. This paper presents measurements
of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived
from the jet-pull angular moment. The measurement is performed in tt¯ events with one leptonically
decaying W boson and one hadronically decaying W boson, using
36.1 fb−1 of pp collision data recorded by the ATLAS detector at √s = 13 TeV delivered by the
Large Hadron Collider. The observables are measured for two dijet systems, corresponding to the
colour-connected daughters of the W boson and the two b-jets from the top-quark decays. To allow
the comparison of the measured distributions to colour model predictions, the measured
distributions are unfolded to particle level, after correcting for experimental effects introduced
by the detector. While good agreement can be found for some combinations of predictions and
observables, none of the predictions describes the data well across all
observables.