Flip the soft lepton sIP in case the Negative CTagger is used

[smoortga]

This PR introduces the possibility to also flip the softElectron and softMuon impact parameter sign in case the negative c-tagger is used. The boolian is by default set to false (no other b-taggers are affected by this), but it is set to true in case the negative c-tagger is used.

@mverzett and @kovitang are interested in following this PR

[cmsbuild]

A new Pull Request was created by @smoortga for CMSSW_8_1_X.

It involves the following packages:

RecoBTag/CTagging
RecoBTag/SecondaryVertex

@cmsbuild, @cvuosalo, @slava77, @davidlange6 can you please review it and eventually sign? Thanks.
@imarches, @acaudron, @JyothsnaKomaragiri, @mverzett, @ferencek, @pvmulder this is something you requested to watch as well.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/14541/console

[cmsbuild]

+1
Tested at: f8b6d57
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15478/14541/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15478/14541/summary.html

[cvuosalo]

+1

For #15478 f8b6d57

Allow sign flipping of the softElectron and softMuon impact parameters for the negative c tagger. There should be no change in monitored RECO quantities.

The code changes are satisfactory, and Jenkins tests against baseline CMSSW_8_1_X_2016-08-16-1100 show no significant differences, as expected.

[cvuosalo]

@monttj: You might want to take a look at this PR. It concerns c tagging.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_1_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar

[davidlange6]

+1

[monttj]

@cvuosalo thank you for letting me know
I would be curious if this flipping will change the discriminator distribution?
e.g. pfCombinedCvsLJetTags, pfCombinedCvsBJetTags

[kovitang]

@monttj and @cvuosalo The flipping will only affect the
pfNegativeCombinedCvsLJetTags and pfNegativeCombinedCvsBJetTags

[smoortga]

Indeed, I did a quick check and the Normal and Positive taggers are unaffected, small changes are observed in the negative tag distributions as expected, but no chocking differences. But still it would be nice to see how it affects the negative tag method for SF_light determination.