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 ...

43Figure 4.9: In this picture we describe the geometrical parameters that describe the Vdetector geometry.efficiency variations with respect to time in order to find some pattern on them that helpedto determine some kind of efficiency periods for later use in the simulation. The resultof the analysis for all the counter efficiencies are presented in the figures 4.11, 4.12, and4.13. Based on this graph three efficiency periods were defined, period 1 from run number6000 to 9000, period 2 from run number 9001 to 11000, and period 3 from run number11001 to 15000. The definition of one period means that the efficiency values that are part

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