Search for collectivity and strangeness enhancement inside high-multiplicity jets in pp collisions with CMS

Recent observations of significant elliptic flow signals within high-multiplicity jets in proton-proton (pp) collisions have raised new questions about the dynamics of jet fragmentation and the possible emergence of collective behavior in small systems. Complementary measurements of strange hadron production, particularly in comparison to light hadrons, within high-multiplicity jets can provide valuable insight into potential strangeness enhancement and QGP-like effects in such environments. To explore these phenomena, a detailed measurement of strange hadron production inside jets is performed in pp collisions at √s = 13 TeV, using the full Run 2 dataset collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb^-1. The production of Λ baryons and K⁰_S mesons in high-multiplicity jets is studied to probe signatures of collective dynamics and to shed light on the hadronization processes at play. The results are compared to predictions from multiple Monte Carlo simulations, including models with thermodynamical string fragmentation and modified color reconnection mechanisms. This measurement provides new input for understanding whether high-multiplicity jets exhibit medium-like behavior and contributes to ongoing efforts to characterize collective effects in small collision systems.