[14_0_X] KalmanFilter fix for Phase 2 L1 tracking

[aehart]

PR description:

This PR resolves the failure reported in #44306. The problem was that matRinv is defined as a 2×2 matrix:
https://github.com/cms-sw/cmssw/blob/CMSSW_14_0_0/L1Trigger/TrackFindingTMTT/src/KFbase.cc#L549
while unitMatrix is defined as a 5×5 matrix (nHelixPar_ is five when running the extended tracking):
https://github.com/cms-sw/cmssw/blob/CMSSW_14_0_0/L1Trigger/TrackFindingTMTT/src/KFbase.cc#L554

So then there is an exception caused by assigning one to the other on this line:
https://github.com/cms-sw/cmssw/blob/CMSSW_14_0_0/L1Trigger/TrackFindingTMTT/src/KFbase.cc#L556
Hence the error message:

…
[a] Fatal Root Error: @SUB=operator=(const TMatrixT &)
matrices not compatible

PR validation:

A recipe for reproducing the exception can be found in #44306. The changes in this PR allow the recipe to run without any exception.

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

Original PR: #44427

[cmsbuild]

A new Pull Request was created by @aehart for CMSSW_14_0_X.

It involves the following packages:

• L1Trigger/TrackFindingTMTT (l1)

@aloeliger, @epalencia, @cmsbuild can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @missirol, @erikbutz, @skinnari this is something you requested to watch as well.
@antoniovilela, @rappoccio, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

• Backported from KalmanFilter fix for Phase 2 L1 tracking #44427

[cmsbuild]

cms-bot internal usage

[aloeliger]

Backport of #44427

[aloeliger]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d53062/38388/summary.html
COMMIT: 7a4d565
CMSSW: CMSSW_14_0_X_2024-03-25-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/44457/38388/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 164 lines from the logs
• ROOTFileChecks: Some differences in event products or their sizes found
• Reco comparison results: 58 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3243082
• DQMHistoTests: Total failures: 1355
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3241705
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 202 log files, 163 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[aloeliger]

+l1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_14_0_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_14_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @antoniovilela, @rappoccio, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)

[antoniovilela]

type bug-fix

[antoniovilela]

+1