Measurement of the angle between jet axes in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV$
- Acharya, Shreyasi et al
- arXiv:2303.13347CERN-EP-2023-046
 | Left: schematic of how energetic partons split or fragment into lower-energy prongs or branches of partons down to a scale in which hadrons emerge. An algorithm can be run over final-state hadrons to cluster them into jets. An inverse declustering algorithm can be used to recursively explore the jet substructure. Right: schematic showing that different jet axes (solid arrows) can be selected from a jet to construct the $\DeltaR$ observable. The Standard axis (represented by a black arrow) is constrained by all the jet constituents (represented by dashed arrows). The SD axis (represented by a dark blue arrow) is determined by the particles left in the jet after grooming (blue and dark red arrows). Finally, the WTA axis (represented by a pink arrow) tends to be aligned with the most energetic constituent. |
 | Top panels: fully corrected \PbPb{} and \pp{} $\DeltaR^{\rm WTA-Standard}$ distributions in the \pTchjet{} intervals $[40,60]$ (left), and $[60,80]$ (right) \GeVc{} for jets of $R=0.2$. The \pp{} baseline is taken from Ref.~\citenum{ALICE:2022rdg}. Central and bottom panels: measured \PbPb/\pp{} ratio in black, as well as predictions from a selection of jet quenching models. |
 | Top panels: fully corrected \PbPb{} and \pp{} $\DeltaR^{\rm WTA-Standard}$ distributions in the \pTchjet{} intervals $[40,60]$ (left), and $[60,80]$ (right) \GeVc{} for jets of $R=0.2$. The \pp{} baseline is taken from Ref.~\citenum{ALICE:2022rdg}. Central and bottom panels: measured \PbPb/\pp{} ratio in black, as well as predictions from a selection of jet quenching models. |
 | Top panels: fully corrected \PbPb{} $\DeltaR^{\rm WTA-Standard}/R$ (left), and $\DeltaR^{\rm WTA-SD}/R$ with $(\zcut=0.2,\beta=0)$ (right) distributions in the \pTchjet{} interval $[100,140]$ \GeVc. Central and bottom panels: measured $\PbPb (R=0.4)/\PbPb(R=0.2)$ ratio in black, as well as predictions from a selection of jet quenching models. |
 | Top panels: fully corrected \PbPb{} $\DeltaR^{\rm WTA-Standard}/R$ (left), and $\DeltaR^{\rm WTA-SD}/R$ with $(\zcut=0.2,\beta=0)$ (right) distributions in the \pTchjet{} interval $[100,140]$ \GeVc. Central and bottom panels: measured $\PbPb (R=0.4)/\PbPb(R=0.2)$ ratio in black, as well as predictions from a selection of jet quenching models. |