Cosmics 2023, comparison between old and Irakli\'s alignment

Legend

The plots show difference (K - L) of DCA parameters and their pulls for two tracks reconstructed from the same cosmic particle.

• K stands for track from top TPC and L for track coming from bottom TPC, i.e. Y for the last track point : Y_K > Y_L,
• For comparision it was used the cosmis data sample from 2023 Run (~10 M events).
• RF and FF stand for old production done with TFG during the data taking, May - Septembet 2023.
• [F|R]FMDF old aligmnet with MDF4 hit errors.
• {R|R]FI the same data processed with TPC inner sector from Jim's pad survey, for outer sector it is used Irakli's parameters, the ideal super sector alignent, and the new parametereization for TPC hit erros.
• {R|R]FIS the same data processed with TPC inner sector from Jim's pad survey, for outer sector and supersectors it is used Irakli's parameters,
• {R|R]FInoMDF the sames as {R|R]FI but with old hit error parameterizations
• Comparsion was done for All, POSitive, NEGative, Looppers, and
• for All, Central (|DCA_XY| < 50 cm), Perifical (|DCA_XY| > 50 cm)

Conclusions

• Irakli aliagment improved momentum resolution by a factor of ~2 (!?). it has to be checked.
• We do need super sector alignmnet: Number of matched pairs reduceded with Irakli aliagmnet by a factor of 2.
• This is the first shot. We need more detailed analysis.

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Fig.1
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Fig.2
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Fig.3
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Fig.4
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Fig.5
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Fig.6
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Fig.7
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Fig.8
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Fig.9
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Fig.10
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Fig.11
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Fig.12
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Fig.13
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Fig.14
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Fig.15
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Fig.16
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Fig.17
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Fig.18
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Fig.19
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Fig.20
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Fig.21
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Fig.22
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Fig.23
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Fig.24
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Fig.25
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Fig.26
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Fig.27
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Fig.28
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Fig.29
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Fig.30
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Fig.31
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Fig.32
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Fig.33
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Fig.34
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Fig.35
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Fig.36
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Fig.37
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Fig.38
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Fig.39
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Fig.40
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Fig.41
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Fig.42