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0001 # Polarization performance
0002 Beam polarizations in 2024 are plotted.
0003
0004 ## Software version
0005 - ana.504 or earlier
0006 - In ana.505, SpinDBContentv1 was introduced. Some modifications are neded in the analysis macro in the newer softwares, but the software version is not essential in this analysis as it just takes polarization and luminosity values from the spin database.
0007 - Spin database: the default QA level is used. Accessed on Sep/11/2025.
0008
0009 ## Runs
0010 All 870 runs in [the golden run list ver2](https://github.com/sPHENIX-Collaboration/analysis/blob/master/runListGeneration/Run2024pp/Full_ppGoldenRunList_Version2.list).
0011 Good spin runs in the golden runs are used.
0012 No polarization selection, such as higher than 30%, is required.
0013
0014 ## Analysis
0015 Run-by-run polarization for each blue and yellow beam is filled into a histogram with weight of the run luminosity, which is obtained by SpinDBContent::GetScalerMbdNoCut.
0016 The histograms are scaled with the total luminosity.
0017 The average polarizations are:
0018 - Blue: 51.9%
0019 - Yellow: 52.6%
0020
0021 ### Analysis code
0022 `macro/polarization.cc`, and other codes in the directory.
0023
0024 ## Results
0025 See [plot](./results/polarization_internal.pdf)
0026
0027
0028
