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

i2.3 FOCUS 43composed of resistive plate chambers which detected muons with an angle greater than 125milliradians.In order to analyze the interactions in the spectrometer, the analog signals from eachof the detectors had to be digitalized and recorded. This was the task of the data acquisitionsystem. The FOCUS data acquisition system had to deal with input data in a number ofdifferent data formats, merge all this data into one stream, and put the output on 8 mmmagnetic tapes. Information from the different detectors was read out and then these datawere put on a data acquisition system bus.Data for each event was taken off the data adquisition system bus and placedinto a temporary memory system; data could be written to and read from this systemsimultaneously. Later on, the data was buffered on disk and written to tape. During therun, FOCUS collected more than z¥{*) events and reconstructed more than zH{ ’ .The FOCUS Collaboration has published four papers studying different topics incharm physics [34–39].