Added Dark Photon Interaction

[dokstolp]

I have included interactions of a dark photon in matter. These are similar to the additions made in 81X for dark photon interactions (PR 16580). @sushilchauhan

[cmsbuild]

A new Pull Request was created by @dokstolp for CMSSW_7_1_X.

It involves the following packages:

SimG4Core/CustomPhysics

@cmsbuild, @civanch, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are listed here #13028

[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/16476/console

[cmsbuild]

+1
Tested at: 68a4c74
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16690/16476/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16690/16476/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 (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar

[davidlange6]

+1