Change fromVertex parameter from False to True for DGL reconstruction

[CeliaFernandez]

PR description:

This PR issue intends to address the reported inefficiency of displaced muons found at low pt.
A deficit of displaced global muons (DGL) for pt < 50 GeV in the barrel region has been reported.
Problem was tracked down to muons reconstructed with the displaced track algorithm = 14 which makes use of the OutsideInMuonSeeder.cc and most specifically the FromVertex parameter that is set to False for DGLs.
A fix for this muons is proposed and consists on setting FromVertex = True consistently in the algorithms used to reconstruct the DGLs.

This PR is backed up by the studies done in the context of a Run 3 dedicated displaced muon analysis (see some of the contacts below). More information can be found in the following presentations:

• PPD General meeting - 26 Jun 2025
• Muon POG meeting - 16 Jun 2025
• Muon POG meeting - 14 Abr 2025

The plan is to merge this in 15_1 and then backport it to 15_0.

For the validation of this PR, we anticipate an increase of muons at low pt in reco::Track displacedGlobalMuons, reco::Muon displacedMuons and reco::Muon slimmedDisplacedMuons.

Contacts: @aescalante @24LopezR @bonanomi

PR validation:

We have a clean build and unit tests pass.

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:

This is NOT a backport, but we are planning to do one for 15_0.

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-48475/45402

[cmsbuild]

A new Pull Request was created by @CeliaFernandez for master.

It involves the following packages:

• RecoMuon/Configuration (reconstruction)

@cmsbuild, @jfernan2, @mandrenguyen can you please review it and eventually sign? Thanks.
@CeliaFernandez, @Fedespring, @HuguesBrun, @abbiendi, @andrea21z, @bellan, @cericeci, @jhgoh, @missirol, @rociovilar, @trocino this is something you requested to watch as well.
@antoniovilela, @mandrenguyen, @rappoccio, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[jfernan2]

please test

[cmsbuild]

+1

Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5ef0ba/47072/summary.html
COMMIT: f97d357
CMSSW: CMSSW_15_1_X_2025-07-03-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/48475/47072/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 1 lines to the logs
• Reco comparison results: 2416 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 4067195
• DQMHistoTests: Total failures: 672
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4066503
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 215 log files, 184 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[CeliaFernandez]

Hi @jfernan2 , the residual changes observed in the displaced muons collections are consistent with the expectations reported in the attached presentations. We were wondering if we could trigger the tests on 1355.0 and 140.109 additionally? Just to cross-check if the effect is more visible there.

Thank you in advance! :)

[jfernan2]

please test workflow 1355.0,140.109

[cmsbuild]

+1

Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5ef0ba/47081/summary.html
COMMIT: f97d357
CMSSW: CMSSW_15_1_X_2025-07-03-2300/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/48475/47081/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 3 lines from the logs
• Reco comparison results: 2792 differences found in the comparisons
• DQMHistoTests: Total files compared: 52
• DQMHistoTests: Total histograms compared: 4217521
• DQMHistoTests: Total failures: 978
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4216521
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 51 files compared)
• Checked 223 log files, 192 edm output root files, 52 DQM output files
• TriggerResults: no differences found

[CeliaFernandez]

Thank you, I think the results make sense looking at the stats.

[jfernan2]

+1

[cmsbuild]

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

[mandrenguyen]

+1