Fix obvious bug in particle boosting - backport of PR #25412 in 9_3_X

[swertz]

Backport of #25412 for 2017 MC generation.

Needed to regenerate M(tt)-binned 2017 ttbar samples following issues reported in https://indico.cern.ch/event/891199/contributions/3761256/attachments/1992750/3323265/NTUA_TMGReport_24Feb.pdf

@covarell

[cmsbuild]

A new Pull Request was created by @swertz (Sébastien Wertz) for CMSSW_9_3_X.

It involves the following packages:

GeneratorInterface/GenFilters

@SiewYan, @efeyazgan, @mkirsano, @cmsbuild, @agrohsje, @alberto-sanchez, @qliphy can you please review it and eventually sign? Thanks.
@alberto-sanchez, @agrohsje, @mkirsano this is something you requested to watch as well.
@davidlange6, @silviodonato, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[qliphy]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/5005/console Started: 2020/03/05 13:43

[cmsbuild]

+1
Tested at: bf1918d
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-87dd5d/5005/summary.html
CMSSW: CMSSW_9_3_X_2020-03-01-0000
SCRAM_ARCH: slc6_amd64_gcc630

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-87dd5d/5005/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 25
• DQMHistoTests: Total histograms compared: 2624448
• DQMHistoTests: Total failures: 196
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2624075
• DQMHistoTests: Total skipped: 177
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -24 KiB( 24 files compared)
• Checked 105 log files, 8 edm output root files, 25 DQM output files

[agrohsje]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_9_3_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_11_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @davidlange6, @silviodonato, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[silviodonato]

+1
@swertz please add some words in the description explaining why you want this backport