Add LHEPtFilter plugin needed for MC generation [106X backport]

[ajgilbert]

PR description:

Backport of #28443, needed in 10_6_X for official production of UL MC using this filter.

Adds a new plugin in GeneratorInterface/GenFilters that applies a user specified pT (or pT range) cut to the p4 sum of a subset of LHE-level particles. This is needed specifically for the production of Wgamma samples binned in the photon pT, but may be useful more generally in the future.

PR validation:

All tests in runTheMatrix.py passed.

if this PR is a backport please specify the original PR:

Yes, #28443

[cmsbuild]

A new Pull Request was created by @ajgilbert (Andrew Gilbert) for CMSSW_10_6_X.

It involves the following packages:

GeneratorInterface/GenFilters

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

cms-bot commands are listed here

[agrohsje]

please test

[cmsbuild]

The tests are being triggered in jenkins.

• CMSSW_10_6_X_2020-09-24-1100/slc7_amd64_gcc700: https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/9544/console Started: 2020/09/24 14:37

[cmsbuild]

+1
Tested at: 746556a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1ac0cf/9544/summary.html
CMSSW: CMSSW_10_6_X_2020-09-24-1100
SCRAM_ARCH: slc7_amd64_gcc700

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1ac0cf/9544/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 34
• DQMHistoTests: Total histograms compared: 3214653
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3214318
• DQMHistoTests: Total skipped: 334
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 33 files compared)
• Checked 140 log files, 14 edm output root files, 34 DQM output files

[agrohsje]

+generators
thanks for the back-port!

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_10_6_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_11_2_X is complete. This pull request will now be reviewed by the release team before it's merged. @silviodonato, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[qliphy]

+1