DIRC background plots

The plots show the measured over the expected value for the DIRC scalers. For each one of the twelve sectors of the DIRC, one phototube is used as a "scaler". The scalers just count the number of hits they receive per second. The first plot shows those values vs time for the last two weeks, the second one shows the same ratio vs luminosity for the previous week (in blue) and for the current week (in red). The calculation of the expected value (that takes into account the beam currents and the luminosity) is based on a background carachterization study made in january 2004.
For more information, see the DIRC web page

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last modified by Viola Sordini, April 19 2007