[Backport 12_4_X] Fix EmissionVetoHook for BB4L

[lauridsj]

PR description:

Backport of #42264 (fixing the Pythia FSR hook for bb4l) to CMSSW 12_4_X for Run3 Summer22 MC generation, as discussed with @Saptaparna.

PR validation:

See #42264.

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:

See above: Backport of #42264 to CMSSW 12_4_X.

[cmsbuild]

A new Pull Request was created by @lauridsj (Laurids Jeppe) for CMSSW_12_4_X.

It involves the following packages:

• GeneratorInterface/Pythia8Interface (generators)

@SiewYan, @mkirsano, @Saptaparna, @cmsbuild, @alberto-sanchez, @menglu21, @GurpreetSinghChahal can you please review it and eventually sign? Thanks.
@alberto-sanchez, @mkirsano this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[Saptaparna]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_4_X IBs after it passes the integration tests and once validation in the development release cycle CMSSW_13_3_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-091cef/33986/summary.html
COMMIT: 1b85711
CMSSW: CMSSW_12_4_X_2023-07-30-0000/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/42423/33986/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: 12 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3766083
• DQMHistoTests: Total failures: 13
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3766047
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 50 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 212 log files, 167 edm output root files, 51 DQM output files
• TriggerResults: no differences found

[perrotta]

+1