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We present the first study of collectivity inside jets with high chargedmultiplicity \nch\ in proton-proton collisions at the Large Hadron Collider. Byincorporating final-state partonic and hadronic interactions through cascademodels among jet shower partons and final hadrons, we investigate and compareto the CMS experimental data on multiplicity distribution, pseudorapiditydistribution, and elliptic anisotropy coefficient $v^{j}_2$ of two-particlecorrelations within the jet. We show that final-state partonic interactions areessential for producing the flow-like long-range correlation, which leads tothe enhanced tail in the \nch\ dependence of $v^{j}_2$ above the non-flowcorrelation from jet parton showering at high multiplicities (\nch$\gtrsim70$)as observed in the CMS experimental data. In addition, we provide predictionsfor the pseudorapidity-gap dependence of $v^{j}_2$ that can be tested in futureexperimental measurements.

Collectivity inside high-multiplicity jets in high-energy proton-proton collisions