Seeding of L2 muons: propagate L1 cands to ME2 if propagation to MB2 fails

[sarafiorendi]

This PR is to fix the inefficiency due to failing propagation of L1 muons from the overlap
region to the reference frame (defined to be MB2 from L1).
The fix consists in a further tentative to propagate the L1 to the endcap reference frame
if the previous propagation fails.

[cmsbuild]

A new Pull Request was created by @sarafiorendi for CMSSW_8_1_X.

It involves the following packages:

RecoMuon/L2MuonSeedGenerator

@cmsbuild, @cvuosalo, @slava77, @davidlange6 can you please review it and eventually sign? Thanks.
@battibass, @abbiendi, @jhgoh, @bellan, @HuguesBrun, @trocino, @bachtis, @rociovilar this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/12991/console

[cmsbuild]

+1
Tested at: 6565a2d
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14505/12991/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14505/12991/summary.html

[slava77]

+1

for #14505 6565a2d

• code changes are in line with description; only HLT is affected (not reco modules)
• jenkins tests pass and comparisons show differences in HLT plots related to muons with an increase in efficiency
• local tests with muon gun MC and doubleMu data show a significant increase of hltL2Muons and related efficiency in MC in the overlap region around 1.2; there is only very minor increase in the data test due to selection bias (HLT already required 2 muons in the original version)
  muon gun pt10 (similar for pt100)
  

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_1_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1