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ALICE in proton-land

ALICE is designed to study collisions of heavy ions. These collisions, which ought to begin at LHC toward the end of 2010, will give physicists the chance to briefly reproduce conditions of the early universe. In the meantime, ALICE is studying proton-proton events like this one, which shows particles emerging from the collision at low momentum; we can tell this by the curvature of their tracks in the magnetic field (the tighter the turn, the less the momentum). Also, a look at the side view on the lower right reveals that the endcap detectors are off. We can tell because we see no tracks less than about 45 degrees from the beam line, which is not shown but runs horizontally across the middle of the image.

Copyright CERN for the benefit of the ALICE Collaboration


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Taken on June 3, 2010