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This work presents the first theoretical investigation of the mediummodification of jet broadening as an event-shape observable in multijet finalstates due to jet quenching in high-energy nuclear collisions. The partonicspectrum of $pp$ collisions with next-to-leading order (NLO) accuracy at$\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV is provided by the POWHEG$+$PYTHIA8 eventgenerator, while the linear Boltzmann transport (LBT) model is utilized toinvestigate the energy loss of fast partons as they traverse through the hotand dense QCD medium. We present the jet broadening distributions in multijetfinal states for both $pp$ and PbPb collisions at $\sqrt{s_{\mathrm{NN}}} =5.02$ TeV, then observe an enhancement at the small jet broadening region andsuppression at the large jet broadening region in PbPb collisions relative tothat in $pp$. This suggests that medium modification with parton energy loss inthe QGP leads to a more concentrated energy flow in all observed multijetevents in PbPb reactions. We also demonstrate that the intertwining of twoeffects, the jet number reduction and the restructured contribution, results inthe novel behavior of nuclear modification of the jet broadening observable inPbPb collisions.

Multijet topology in high-energy nuclear collisions: jet broadening