Unexplained long-range correlations in p-Pb collisions

CMS has published its first paper on proton-lead (p-Pb) collisions, describing the observation of a phenomenon that was previously seen first in nucleus-nucleus collisions but also detected by CMS in proton-proton (p-p) collisions. The effect is a correlation between pairs of particles formed in high-multiplicity collisions — that is, collisions producing a high number of particles — and manifests as a ridge-like structure.

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