New SoftMuon ID selector

[trocino]

Hi,
this is an update of the SoftMuon ID selector in
DataFormats/MuonReco/src/MuonSelectors.cc
as described in the Muon POG Twiki:
https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideMuonId#New_Version_recommended.
The optimization of the new working point was carried out by I. Krätschmer, as well as the performance studies:
https://indico.cern.ch/event/277448/material/slides/0?contribId=3
https://indico.cern.ch/event/316122/contribution/3/material/slides/0.pdf.
In few words, the cut on the number of pixel layers is loosened from >1 to >0, the transverse and longitudinal impact parameter cuts are tightened from 3cm to 0.3cm and from 30cm to 20cm, respectively, and the cut on the track chi^2 is replaced by a requirement for the track to be high-purity.
The change does not have any effect at reconstruction level.

[cmsbuild]

A new Pull Request was created by @trocino (Daniele Trocino) for CMSSW_7_3_X.

New SoftMuon ID selector

It involves the following packages:

DataFormats/MuonReco

@cmsbuild, @nclopezo, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@abbiendi, @bachtis, @battibass this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[StoyanStoynev]

@cmsbuild please test

[cmsbuild]

+1
Tested at: 9bb18c5
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6032/433/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6032/433/summary.html

[StoyanStoynev]

+1
Tested 9bb18c5 on top of CMSSW_7_3_X_2014-10-25-1400, short and extended matrix tests, FWLite and DQM comparisons . Performance is as expected. There are overall more soft muons (both in muon and non-muon /QCD/ datasets). In the barrel they are mostly coming from the removed chi2 cut. There are no other features observed (geometrical or kinematic) for muons. No other effects observed.

wf 20 (muons, pt = 10 GeV):

wf 38 (flat pt QCD):

[StoyanStoynev]

As usual, red is this PR.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_3_X IBs unless changes (tests are also fine). This pull request will be automatically merged.