Seminar in Hadronic Physics

New insights of collective phenomena in pp, pA and AA collisions at the LHC

Wei Li

Rice University

Observation of long-range near-side two-particle correlations in high-multiplicity pp and pPb collisions at the LHC opened up new opportunities of exploring novel QCD dynamics in small collision systems. In recent years, significant progress has been made in unraveling the nature of this “ridge-like” correlation structure, particularly its connection to the collective flow phenomena of a fluid-like state observed in relativistic heavy-ion collisions. In this talk, I will review the current status of studying “collectivity” in pp, pPb and PbPb collisions at the LHC with the CMS experiment. In particular, I will discuss a new measurement of event plane fluctuations that could give us new insights to the initial-state fluctuations and three-dimensional evolution of these collisions. Prospects of future studies will also be discussed in the end.