CERN Heavy Ion Forum

Collectivity in small systems -- Initial state vs. final state effects

by Soeren Schlichting (University of Washington)

4-3-006 - TH Conference Room (CERN)

4-3-006 - TH Conference Room


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Observation of long rang azimuthal correlation in small collision systems (p+p/A) has triggered an enormous excitement in the heavy-ion community. However, it is presently unclear to what extent the experimentally observed correlations should be attributed to initial state momentum correlations and/or the final state response to the initial state geometry. Based on a short introduction, I will discuss how initial state momentum correlations emerge naturally in high-energy scattering processes and address the question to what extent collective features can be described from an initial state perspective. By further matching the initial state in p+Pb collisions to a partonic transport model, I will also present first results to quantify the relative importance of initial state and final state effects as a function of the event multiplicity.


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