update SherpaHardronizer for HepMC3

[shimashimarin]

PR description:

Add SherpaHepMC3Hadronizer.cc to be compatible with HepMC3. The latest Sherpa 2.2.16 is compiled with HepMC3 link.

PR validation:

Local test with DY@LO have been performed plots. The functionality works.

NOTE:

• Option -H HepMC3 should be added while running ./PrepareSherpaLibs.sh to generate Sherpack GENERATOR Documentation - Create Sherpack;
• Or, default HepMC2 is applied for event generation.

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50591/48776

[cmsbuild]

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

It involves the following packages:

• GeneratorInterface/SherpaInterface (generators)

@cmsbuild, @lviliani, @mkirsano, @sensrcn, @theofil can you please review it and eventually sign? Thanks.
@alberto-sanchez, @mkirsano, @thuer this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[mandrenguyen]

please test

[cmsbuild]

+1

Size: This PR adds an extra 16KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-0bc153/52407/summary.html
COMMIT: 2360896
CMSSW: CMSSW_16_1_X_2026-04-01-1100/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/50591/52407/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
• ROOTFileChecks: Some differences in event products or their sizes found
• Reco comparison results: 5 differences found in the comparisons
• DQMHistoTests: Total files compared: 53
• DQMHistoTests: Total histograms compared: 4180749
• DQMHistoTests: Total failures: 67
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4180662
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 52 files compared)
• Checked 227 log files, 197 edm output root files, 53 DQM output files
• TriggerResults: no differences found

[cmsbuild]

Milestone for this pull request has been moved to CMSSW_17_0_X. Please open a backport if it should also go in to CMSSW_16_1_X.

[lviliani]

+generators

[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. @sextonkennedy, @ftenchini, @mandrenguyen (and backports should be raised in the release meeting by the corresponding L2)

[ftenchini]

+1