High Energy Hadronic and Nuclear Reactions

Hadronic processes with large momentum exchange are well described by perturbative Quantum CromoDynamics (pQCD) resulting from interactions between elementary constituents (quarks and gluons). In earlier experiments at hadron accelerators, the need for large momentum exchange considerably limited the kinematic regime accessible to pQCD, so that only a small fraction of all inelastic events could be described in perturbation theory. The large flux of parton (quarks and gluons) at the CERN LHC has now greatly increased the kinematic domain accessible to pQCD, thereby making possible and even rather frequent, those events in which multiple interactions between elementary constituents take place in a single inelastic hadronic collision. One reason for the interest in these multiple parton interactions (MPIs), is that they enable us to probe the hadron in different points at the same time, opening up new avenues for a better understanding of hadron structure. In fact, the combined analysis of MPIs in proton-proton collisions and in collisions between light nuclei allow us to disentangle various different terms of correlation of hadron structure. Another source of interest is that a proper understanding of the rates of MPI is mandatory for a correct evaluation of the different backgrounds in the various channels of reaction, taken into consideration in order to identify processes with new physics at the LHC.

Head of Research Group
Head: 
Daniele Treleani

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Last update: 10-18-2019 - 18:50