How many zeros (00)00xx00(00) in SMD gives the best MIP ?

  • Input: ~950K minB pp events from 2004 run. Only data from sector 5 are analyzed below.
  • Data corruption is of 3.8% (with the zero tolerance approach), accepted 949458 out of 988000 input events. Used runs: R5107005 R5107008 R5109025 R5109026 R5109035 R5109034 R5109031 R5109030 R5112004
  • Vary number of '0' before and after 'x' in the SMD pattern. Test with : 2,4,8,16,32,64 zeros. It is equivalent to veto 1,2,...,32 cm on both sides of fired SMD strip(s).

  • Conclusions:
    * # of MIP's per tower changes very slowly with # of '0' (see second column)
    * position of the peak is stable +/- 5-10% with varied # of '0' (third column)
    * sigma of MIP peak gets narrower with larger # of '0'
    * towers on corners of a sector are lost with large # of '0'
    * Lets use 8 zeros for further analysis
    Fig 1.Distribution of X vs. Y of UxV (post shower in coincidence). For nZero=4,16, and 32.

  • Histograms accumulated for every tower
    * 'b'+ name : requires only positive ADC in post-shower, red
    * 'c'+ name : positive post-shower and UxV in this tower, blue

    Fig 2. Example of tower response 05TC02 --> MIP peak is in blue. Test with : 2,4,8,16,32,64 zeros. ( PS )
    Gaussian fit:
    nZeros amplitude mean sigma
    2 43.5 +/- 3.0 5.8 +/- 0.2 3.21 +/- 0.17
    4 34.6 +/- 2.9 6.3 +/- 0.2 3.37 +/- 0.25
    8 31.7 +/- 2.9 6.2 +/- 0.2 2.72 +/- 0.18
    16 26.3 +/- 2.7 6.4 +/- 0.2 2.62 +/- 0.19
    32 17.0 +/- 2.2 6.4 +/- 0.3 2.70 +/- 0.29
    Fig 3. Example of tower response 05TC04 --> MIP peak is in blue. Test with : 2,4,8,16,32,64 zeros. ( PS )
    Gaussian fit:
    nZeros amplitude mean sigma
    2 50.6 +/- 3.5 6.4 +/- 0.3 3.46 +/- 0.27
    4 42.8 +/- 3.3 6.7 +/- 0.2 3.24 +/- 0.25
    8 29.8 +/- 2.8 7.1 +/- 0.3 3.06 +/- 0.27
    16 24.2 +/- 2.5 7.3 +/- 0.2 2.70 +/- 0.21
    32 20.0 +/- 2.4 7.7 +/- 0.2 2.39 +/- 0.19
    64 13.3 +/- 1.9 7.9 +/- 0.3 2.33 +/- 0.22
    Fig 4. Example of tower response 05TC11 --> MIP peak is in blue. Test with : 2,4,8,16,32,64 zeros. ( PS )
    Gaussian fit:
    nZeros amplitude mean sigma
    2 12.7 +/- 1.3 15.7 +/- 0.5 5.91 +/- 0.53
    4 10.4 +/- 1.2 15.6 +/- 0.6 5.87 +/- 0.57
    8 7.7 +/- 1.0 15.2 +/- 0.9 6.16 +/- 0.93
    16 6.4 +/- 1.1 15.0 +/- 0.9 5.69 +/- 0.93
    32 5.2 +/- 0.9 14.6 +/- 1.1 6.27 +/- 1.30
    64 4.9 +/- 0.9 15.4 +/- 0.8 5.14 +/- 0.83