Tweaked pixel pair MVA selection for pp_on_AA

[abaty]

PR description:

This PR tweaks the MVA selection for the pixel pair recovery step in heavy ion collisions. This step was seen to cause a large fake rate that was problematic for jet reconstruction in central events. The required MVA value is simply required to be slightly higher to curtail the amount of fake tracks. This change is needed for a reRECO of the jet-triggered data.

PR validation:

More information on the effects of this change can be found in the presentation that was shown at the XEB meeting today:

https://www.dropbox.com/s/j4ej3pc7tdroy4p/HI-PAG_FakeJets_20190318.pptx?dl=0#

@icali @mandrenguyen @echapon

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-26217/8835

• This PR adds an extra 16KB to repository

[cmsbuild]

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

It involves the following packages:

RecoTracker/IterativeTracking

@cmsbuild, @perrotta, @slava77 can you please review it and eventually sign? Thanks.
@makortel, @felicepantaleo, @GiacomoSguazzoni, @rovere, @VinInn, @mschrode, @gpetruc, @ebrondol, @dgulhan this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[perrotta]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/33674/console Started: 2019/03/19 17:51

[cmsbuild]

+1
Tested at: 2a82046
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26217/33674/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26217/33674/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 510 differences found in the comparisons
• DQMHistoTests: Total files compared: 32
• DQMHistoTests: Total histograms compared: 3114829
• DQMHistoTests: Total failures: 1028
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3113604
• DQMHistoTests: Total skipped: 197
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 31 files compared)
• Checked 133 log files, 14 edm output root files, 32 DQM output files

[slava77]

More information on the effects of this change can be found in the presentation that was shown at the XEB meeting today:

is there a more permanent link (indico or similar)?

[slava77]

in jenkins wf 140.56 (2018 data)

this looks consistent with p6 in the slides provided with this PR description.

Also, as expected, the generalTracks are affected only in the quality variable (no other changes in generalTracks)

[slava77]

+1

for #26217 2a82046

• changes are as described in the slides
• jenkins tests pass and comparisons with the baseline show differences only in the HI workflows with pp_on_AA reconstruction

[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. @davidlange6, @slava77, @smuzaffar, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[abaty]

is there a more permanent link (indico or similar)?

I also put the file here on a twiki page:
https://twiki.cern.ch/twiki/pub/CMS/HITracking2018PbPb/HI-PAG_FakeJets_20190318.pptx

[fabiocos]

+1