August 13, 2008 4:00 AM PDT
An engineer attaches photomultiplier tubes to the electromagnetic calorimeter on the Large Hadron Collider beauty, or LHCb, experiment. LHCb investigates the slight differences between matter and antimatter by studying a type of particle called the "beauty quark" or "b quark," according to CERN.
These large wall detectors will be used to study the bottom quark, a heavy, short-lived version of quarks found in protons and neutrons. The electromagnetic calorimeter will be used to detect photons, electrons, and positrons produced by the decay of these short-lived quarks, according to CERN.
Photo by Maximilien Brice for CERN
Caption by Michelle Meyers
