Speaker
Description
Recent CMS measurements of high-multiplicity jets have revealed intriguing structures in two-particle correlations within jets containing over 80 charged tracks, potentially indicating the presence of final-state interactions beyond those modeled in existing parton shower frameworks. We investigate two mechanisms of final-state interaction that may become significant when the phase-space density of partons in a jet reaches high levels: (1) two-to-two partonic rescattering and (2) two-to-one merging of parton pairs with small invariant mass. These processes are implemented approximately after the PYTHIA8 shower, with careful modeling of spacetime structure and tracking of color flow in the final-state interactions. Our results show an increase in two-particle correlations at high multiplicity, suggesting a potential link to CMS observations. This study could provide new insights into the behavior of QCD hard processes under high-multiplicity conditions.
| Category | Theory |
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