A Search for Rare Decay D0 --> mu+mu - High Energy Physics UPRM

photons with a high energy (about 300 “•”—– ). At Fermilab the initial beam is a 800 “ª”¢–i2.3 FOCUS 392.3.2 The FOCUS Photon BeamTo photoproduce particles which contain the charm quark it is necessary to generateTevatron proton beam [31, p.10].Figure 2.3: The E831 Photon Beam (FOCUS Collaboration Figure).As shown in Figure 2.3, a photon beam was produced after three different stages.A neutral beam produced from “•”—– 800 protons incident on a liquid deuterium targetincluded a variety of neutral particles along with high energy photons from a decays.Charged secondaries and uninteracted protons were taken out of the beam and absorbedby the beryllium target dump (not shown). All the neutral secondary trajectories produced