Add GenPlusSimParticles_cfi.py.

[wulsin]

Add customize configuration file to produce/keep a collection of particles simulated by GEANT combined with generated particles.

[wulsin]

The motivation for this pull request is to be able to produce signal MC samples with central production, for the Run 2 Exotica search for disappearing tracks. Please let me know if I should additionally make a pull request to 7_6_X. I did the PR for 7_1_X because that is the release used for the Run II Winter 15 GEN-SIM campaign. Thanks!

[cmsbuild]

A new Pull Request was created by @wulsin (Wells Wulsin) for CMSSW_7_1_X.

Add GenPlusSimParticles_cfi.py.

It involves the following packages:

SimG4Core/CustomPhysics

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[civanch]

@wulsin , please, clone this PR to 7_6_X

[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: e47f208
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11082/7828/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
e47f208
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11082/7828/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11082/7828/git-merge-result

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11082/7828/summary.html

[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[wulsin]

The motivation for using the GenPlusSimParticleProducer module for the simulation of exotic long-lived particles has been described in two presentations to the Simulation group:
4 Apr 2014: https://indico.cern.ch/event/310815/session/1/contribution/12/attachments/594838/818730/20140404_SimulationMtg.pdf
6 Mar 2015: https://indico.cern.ch/event/377207/session/0/contribution/6/attachments/752124/1031818/20150306_SIMExotica.pdf

[wulsin]

Vladimir suggested that I specify the type of the collection produced by GenPlusSimParticleProducer, which is vector < reco::GenParticle > .

Also, the same PR for 7.6.X: #11083 has been merged.

Please let me know if any more information is needed.

[davidlange6]

+1