Figure 1

Representation of different jet axes. The colored dashed lines represent particles comprising the jet in the initial sample constructed with the anti-$k_{\rm T}$ algorithm and $E$ recombination scheme. These define the ``Standard'' jet axis. The grooming procedure removes soft wide-angle radiation (represented by orange long-dashed lines), and the resulting axis (``Groomed (SD)'') is defined by the remaining particles (red dashed and blue dotted lines). Finally, the ``WTA'' axis, which is determined with all the particles in the initial (ungroomed) jet, tends to be aligned with the most-energetic particle in the jet. The $\Delta R_{\rm axis}$ observable is determined from the angle between any pair of these axes.