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Fix dependency of CDC tracks on the SC by restoring minimum t0 - #1179

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nsjarvis wants to merge 2 commits into
masterfrom
nsj_t0
Open

nsjarvis wants to merge 2 commits into
masterfrom
nsj_t0

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@nsjarvis

@nsjarvis nsjarvis commented Oct 29, 2026 •

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I restored some of the code that Simon had removed and the issues with the CDC time residuals moving by 10um when ignoring the SC in track-fitting seem to be fixed.

CDC time to residuals plots follow.
This is using version set 7.8.0.

Left: normal tracking
Right: ignoring the SC, using -PUSE_SC_TIME=0
run_133600_500k

Same thing with this PR, fewer events
run_133600_nsj_t0_nsj_t0_nosc

One might wonder why I would ignore the SC. It is to set the CDC base time offset so that the mean residuals do not change whether the SC is used or not. It could never be used for tracks that passing through the central gap in the nose.

@staylorjlab staylorjlab left a comment

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It does not look like you restored the code that computes the minimum drift time for the forward tracks.

@gluex

gluex commented Oct 29, 2026

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Test status for this pull request: SUCCESS

Summary: summary.txt
Logs: results/log

Build log: make_nsj_t0.log
Build report: report_nsj_t0.txt

@nsjarvis

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I will check.

@nsjarvis

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I restored that section too, will post new plots.

@nsjarvis

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run_133600_nsj_t0_rev_nsj_t0_nosc_rev

@gluex

gluex commented Oct 29, 2026

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Test status for this pull request: SUCCESS

Summary: summary.txt
Logs: results/log

Build log: make_nsj_t0.log
Build report: report_nsj_t0.txt

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3 participants