Speaker
Description
We explore modification of jet properties in high-multiplicity proton-proton (pp) collisions at $\sqrt{s} = 13$ TeV, utilizing the PYTHIA 8 Monash 2013 Monte Carlo simulation. While the formation of a quark-gluon plasma (QGP) is typically associated with jet quenching, our investigation focuses on jet modifications arising purely from non-QGP mechanisms, including color reconnection (CR) and multiparton interactions (MPI).
We analyze intra-jet properties, specifically the jet shape observable $\rho(r)$ and fragmentation distribution $z^{\rm ch}$. Our results demonstrate that the interplay between MPI, CR, and gluonic contributions to jets in high-multiplicity events leads to significant broadening and softening of jets compared to minimum bias events, particularly at low-$p_{\rm T}$ regime. A direct correlation is observed between the average number of multiparton interactions, the gluonic contribution, and the extent of modification in $\rho(r)$, indicating that higher number of MPIs and/or gluonic contributions correspond to greater modifications in jet properties. These findings underscore the rich interplay of dynamics in high-multiplicity environments, providing valuable insights into the mechanisms at play, independent of QGP formation.
