New cpe for 1mip

[wmtford]

This is an alternative option to PR #7082. This version sets the new CPE on by default, with the customization option to turn it off. Reviewers can decide which version is preferred.

[cmsbuild]

A new Pull Request was created by @wmtford for CMSSW_7_4_X.

New cpe for 1mip

It involves the following packages:

RecoLocalTracker/SiStripRecHitConverter

@cmsbuild, @cvuosalo, @nclopezo, @slava77 can you please review it and eventually sign? Thanks.
@makortel, @forthommel, @yduhm, @GiacomoSguazzoni, @gbenelli, @rovere, @VinInn, @nickmccoll, @jlagram, @gpetruc, @cerati, @threus, @venturia this is something you requested to watch as well.
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[slava77]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 3cdc013
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7091/1766/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7091/1766/summary.html

[slava77]

+1

for #7091 3cdc013

tested with higher stat tests in CMSSW_7_4_X_2015-01-07-1000 (test area sign486)

overall, results are as expected from tests done earlier by Matti for the tracking reco https://mkortela.web.cern.ch/mkortela/tracking/validation/CMSSW_7_4_0_pre2_v3/index.html
, and I haven't found adverse effects on higher level objects (minor changes are more or less everywhere, but don't suggest degradation in performance).

• the effect of the PR is the largest at the strip hit level: pulls and resolutions change a lot, absolute residuals are somewhat unchanged
• the reconstructed tracks have slightly larger chi2 with smaller peak/(reduction in population) at chi2Prob=1; otherwise track efficiency is the same and fake rates reduce a bit
• timing is unchanged (there is some indication that it even reduces in the very high-pt jet tracking with ~20% reduction in jetCore and tobtec tracking, but stats are low and it could be a smaller single-event effect)

I post several plots below in support of comments above

3TeV dijet sample (1313.0)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request will be automatically merged.