charm decays with photons in the final state and trigger counter ...

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charm decays with photons in the final state and trigger counter ...

to the other, that were part of the first level trigger called “The Master Gate”. The ¡©©¡22trigger level system of the experiment. The components of the trigger system are: TR1,¡ TR2, , OH, IM1,IM2, HC, AM, and AMD. Basically all these elements are builtfrom scintillator counters. TR1 and TR2 were set at the target region (see figure 2.3). Thepurpose of TR1 was to determine that an interaction occured at the target region, and thepurpose of TR2 was to identify if a charged particle from the principal interaction enteredthe M1 aperture which means that a particle cross through the SSD detectors.The¡ was placed between C3 and IE. They are two scintillator planes, one nexthad two output signals; ¥. The first one implies that one chargedparticle passed through the two planes, and the other one that two particles passed through¡ and ¥¡it. The OH plane was positioned in the front of the OE. This one had 24 counters and waspart of the Master Gate logic too. The IM1 and IM2 were part of the muon trigger system.IM1 was next to MH2, a muon detector plane, and IM2 next to MH3. AM, and AMD wereplaced upstream the experimental target. A coincidence between them implies the presenceof halo muons (muons produced upstream the target). The hadron calorimeters (HC) whereused as triggers too, but they are explained elsewhere [10].The primary Master Gate (MG) or ”base trigger” is defined as§¥ ¥(2.2)¢¡ ¥¡¡¤£where ‘ § ’ means the logical expresion OR and ‘£ ’ means AND. This expresion (2.2) meansthat all physically interesting events must have at least two charged particles in the innerregion of the experiment or one in the inner part and the other in the outer site. There

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