[Backport 12_4] Pythia Update to fix tau decays

[aandvalenzuela]

Backport of #8139.

[cmsbuild]

A new Pull Request was created by @aandvalenzuela (Andrea Valenzuela) for branch IB/CMSSW_12_4_X/master.

@cmsbuild, @smuzaffar, @aandvalenzuela, @iarspider can you please review it and eventually sign? Thanks.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.
cms-bot commands are listed here

[aandvalenzuela]

please test with cms-externals/pythia8#29

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-308c91/28526/summary.html
COMMIT: 87fe2de
CMSSW: CMSSW_12_4_X_2022-10-25-2300/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/8147/28526/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 3675164
• DQMHistoTests: Total failures: 8
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3675134
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 208 log files, 45 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[aandvalenzuela]

Hi @agrohsje,
Should we also backport it to 12_5 for consistency, although used for heavy ion?
Thank you!

[perrotta]

Hi @agrohsje, Should we also backport it to 12_5 for consistency, although used for heavy ion? Thank you!

@aandvalenzuela please prepare also the backport to 12_5 for whatever is backported to older cycles

[agrohsje]

Thanks @aandvalenzuela and @perrotta! It should not impact HI but better/easier to have it for both.

[perrotta]

+1

• As decided during the ORP meeting of Oct 25
• It does not affect minbias production for PU samples

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_12_4_X/master IBs (tests are also fine). This pull request will be automatically merged.