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kaonLT/pionLT meeting minutes. June 8, 2023
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Richard:
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Luminosity analysis: looked at higher rate coincidence running - (up to
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1.25 kHz). Still looks good, but lever arm only about 200 Hz.
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The LH2 tracks from the single arm lumi scans do not behave as well as the
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carbon tracks did. There appears to be different trends at different energies.
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Will consult with Peter and Carlos.
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HGC efficiency script: issues with slurm job memory persist.
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Ali:
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Revisiting the strange trend that Ali saw in the HMS momentum offset. DG
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sees similar (though not identical) trend in inclusive data from 2022-23.
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The region between 4-6 GeV looks especially interesting. Ali will look into
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adding 2021-2022 data. Dave will check that HMS setting program did not change
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between kaonLT and pionLT. Ali will also look at Heep singles.
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Starting to test LT separation code.
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Alicia:
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Got PARTONS working and has GK predictions for beam spin asymmetry. There was
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some discussion about how to make the curves look smoother - this is tricky
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since the model is evaluated at different (x,Q2,t) to match data.
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Regarding PARTONS/GK - the LT cross sections are in the code, but not an
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"observable" in the output, so code needs some modification to make available.
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Some issues with VGL prediction for beam spin asymmetry - way too small. Has
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anyone used VGL for this observable that might have some insight?
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Looking at systematic errors (Mx cut dependence, coin time cut dependence).
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Still need beam polarization - Dave said he would produce those before next
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meeting.
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Nathan:
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Nathan was elected as JLUO grad student rep. Congratulations Nathan!
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Working on NGC calibrations - got the mutli-Gaussian method working, although
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fits sometimes give results that aren't right, so need some attention. Also
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testing the default Poisson fit. There is some systematic difference
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between the 2 methods, but the Poisson fit seems to be more stable (fewer
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parameters), so will likely use that method.
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