DT meantimer tune

[ptraczyk]

A small tuning of MT reco following the enabling of realistic hit uncertainties. A very small but consistent improvement in chi2, resolution, efficiency etc in RelVals.

Due to tightened chi2 cuts in segment building the numbers of hits become lower, this is expected (quality improves and efficiency does not suffer):

[cmsbuild]

A new Pull Request was created by @ptraczyk (Piotr Traczyk) for CMSSW_7_2_X.

DT meantimer tune

It involves the following packages:

RecoLocalMuon/DTSegment

@nclopezo, @cmsbuild, @thspeer, @StoyanStoynev, @slava77, @Degano can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4018/23/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4018/23/summary.html

[slava77]

testing

[slava77]

segment parameters are changing more substantially than the final muons:
here are some plots in muon gun pt10 (comparing with CMSSW_7_2_X_2014-05-29-1400)

The effect is even more visible for 1 TeV muon gun (with more radiation and now tighter cuts, segments are visibly shorter; this is not affecting final tracks that much)

I guess, these are somewhat expected
.. more later

[slava77]

For muon guns (similar for background samples, less stats there though)

• Track parameters don't change significantly
• slightly better time at IP error (10 GeV sample plot below)
  
• slightly worse theta residuals /pulls for track-segment matching (10 GeV muons below, red is new)
  

[slava77]

+1

for #4018 bba55da
based on the review above: changes are somewhat in the right direction (not everything is improved)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes (tests are also fine).

[slava77]

@ktf @nclopezo @Degano
Why is this still not merged?
Please check
Thanks