Speaker
Description
Multi-Parton Interactions (MPI) are a key component in the description of proton–proton collisions at high energies, providing important contributions to the underlying event and to the simultaneous production of multiple hard final states. This contribution presents an overview of the main CMS results related to MPI studies, with a focus on processes sensitive to Double Parton Scattering (DPS) and higher-order partonic interactions. In particular, DPS constitutes an important background to Higgs boson production and measurements. Measurements involving quarkonium and jet final states are discussed, including multiple J/ψ production, such as double J/ψ at 7 TeV and triple J/ψ at 13 TeV, as well as mixed heavy-flavor channels like J/ψ+D*. Results from purely hadronic and electroweak final states, including four-jet production, W+2 jets, and WW production, are also presented, covering different center-of-mass energies and kinematic regimes. The extracted values of the effective cross section are compared across different channels and collision energies, allowing tests of its universality and investigations of possible dependencies on the hard scale, process type, and event topology. Finally, prospects for MPI studies at CMS are discussed, including expected improvements with Run 3 and HL-LHC data and their impact on the tuning of phenomenological models and event generators.
| I read the instructions above | Yes |
|---|