Using the P24iy_calib3 calibration production for which TPC SpaceCharge & GridLeak distortion corrections were turned off, but otherwise the same as the P24iy_calib production of Run 19 19.6 GeV data ... and repeating what I did for h-/h+ in Run 19 19.6 GeV with new TPC alignment (for which those distortion corrections were turned on as usual) ...

To begin, here are my usual set of fits and fit parameters for the double ratios of h^-/h⁺:



And the subsequent fit parameters:

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Next is a direct comparison with the results for the Run 19 AuAu 19.6 GeV collision data with SpaceCharge & GridLeak corrections turned on. Here I first show the west sectors, 1-12, with global tracks on the top two rows, and primary tracks on the lower two. The SpaceCharge-corrected 19.6 GeV data is the darker colors red & blue, and the SpaceCharge-uncorrected data is the lighter colors orange and cyan.



Similarly for the east sectors 13-24:



Retaining the same colors as above, here are the fit parameter comparisons for globals (top) and primaries (bottom), showing how the sector-to-sector variations are to first order unchanged between the two datasets, indicating that SpaceCharge & GridLeak corrections are not contributing factors to these variations (this is an expected result, as the GridLeak correction is near zero in the iTPC-era data, and the SpaceCharge correction is globally the same for all sectors, such that while it would alter h^-/h⁺ in each sector, normalizing to the result from all 24 sectors as I do in these double ratios cancels out the impact):

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We can do more comparisons... Instead of dividing by the whole-TPC h-/h+, here they are as single ratios for west sectors 1-12, with the same color scheme as above for dark and light colors...



...and east sectors 12-24:



Now, I can do a sector-by-sector ratio of 19.6 GeV without SpaceCharge & GridLeak corrections to with corrections. Here I return to my original color choices of globals in red, and primaries in blue.





...and the results of the fit parameters:



We see a few things:

1. There is generally no sector-to-sector dependence (though it might be interesting to understand why there are any at all, these variations are very small).
2. The global tracks are much more impacted by SpaceCharge than the primary tracks.
3. The impact of SpaceCharge on momenta in this 19.6 GeV data is actually less than the impact of whatever is causing the sector-to-sector variations we are concerned with (probably TPC sector-wise alignment).

-Gene