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@tomalin tomalin commented Dec 12, 2025

PR description:

Thanks to this PR, the covariance matrix obtained from the HYBRID KF fit is now stored in the TTTrack object, and a couple of histograms "resOverSigma*z0"plotting z0 resolution divided by the uncertainty in the z0 taken from this matrix have been added to L1TrackNtuplePlot.C .

In addition, the TTTrack object has been slightly tidied up. This clean up preserves backwards compatibility, so it should still be possible to read old datasets, but a couple of changes are needed to L1 trigger code.

Since the TTTrack function stubPtConsistency() was renamed chi2BendRed() some years ago, and this PR deletes the obsolete name, I've made a PR cms-sw#49565 to central CMSSW to change the few L1 trigger routines that have not changed to the new name.

Quantile based resolution plots have been enabled in L1TrackNTuplePlot.C for the d0. And also for the beam-constrained Pt and phi0.

PR validation:

No change in tracking performance.

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