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The CMS Collaboration at CERN released today a paper entitled "Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions" that details signs of a new phenomenon in proton interactions.

A study of "high multiplicity" collisions, where a hundred or more charged particles are produced, has revealed indications that some particles are somehow "correlated" – associated together when they were created at the point of collision.

It was considered natural to search for these correlations in the highest multiplicity proton-proton collisions at LHC as the particle densities begin to approach those in high-energy collisions of nuclei such as copper, where similar effects have already been seen...

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