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The distribution and orientation of energy inside jets is predicted to be anexperimental handle on colour connections between the hard--scatter quarks andgluons initiating the jets. This Letter presents a measurement of thedistribution of one such variable, the jet pull angle. The pull angle ismeasured for jets produced in $t\bar{t}$ events with one $W$ boson decayingleptonically and the other decaying to jets using 20.3 fb$^{-1}$ of datarecorded with the ATLAS detector at a centre-of-mass energy of $\sqrt{s}=8$ TeVat the LHC. The jet pull angle distribution is corrected for detectorresolution and acceptance effects and is compared to various models.

Measurement of colour flow with the jet pull angle in $t\bar{t}$ events using the ATLAS detector at $\sqrt{s}=8$ TeV