European Organization for Nuclear Research

proton-lead collisions

First collisions of pPb run with stable beams

2013-01-20, by Maria Chamizo Llatas

The LHC has just delivered the first pPb (proton-lead) collisions with stable beams of 2013 and CMS is happily running with all sub-detectors on. We are also having common triggers with TOTEM and everything is behaving very well.

A jubilant CMS Control Room, shortly after the LHC provided the first pPb collisions with stable beams.

Colliding different particle species: the LHC's proton-lead run

2013-01-18, by Achintya Rao

The new year brings a new type of collision at the LHC: the accelerator will smash protons and lead nuclei together, allowing CMS and the other LHC experiments to study the cold nuclear matter we expect these collisions to produce.

A proton-lead collision at a centre-of-mass energy of 5 TeV per nucleon. In this side-on view, the proton beam enters from the right side of the image and leaves on the left; the lead beam travels in the opposite direction. The event was selected requiring a muon trigger, and the muon (red line) was reconstructed in the CSC detectors.

Unexplained long-range correlations observed in pPb collisions

2012-10-22, by Wei Li

CMS has published its first paper on proton-lead (pPb) collisions, describing the observation of a phenomenon that was previously seen first in nucleus-nucleus collisions but also detected by CMS in proton-proton (pp) collisions.

Figure 1: Two-particle correlation functions for 7 TeV pp (a), 2.76 TeV PbPb (b), and 5.02 TeV pPb (c) collisions. The arrow shows the long-range correlations at small Δφ.
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