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Skip to main content Topics Higgs boson Neutrinos Dark matter Dark energy New physics Applications Full archive Follow Search A joint Fermilab SLAC publication LHC sees first low-energy collisions 05 05 15 By Sarah Charley The Large Hadron Collider is back in the business of colliding . particles ATLAS collaboration Today low-energy protons met in the hearts of the four Large Hadron Collider experiments . These test collisions will help the ALICE , ATLAS , CMS and LHCb collaborations calibrate their detectors in preparation for the high-energy collisions scheduled for early . June Our detectors need to be able to distinguish between two particles separated by about the width of a human hair , rdquo says Fermi National Accelerator Laboratory researcher Greg Rakness , run coordinator for the