consistently use momentum at POCA for PFDisplacedVertex momentum computations (same as #9703 from 74X)

[slava77]

other than fixing a technical bug, it also allows to run (particleFlowDisplacedVertexCandidate+particleFlowDisplacedVertex) on AOD.

The difference in results is at numerical roundoff level (checked on ~1K events in ttbar with PU=35).

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_7_5_X.

consistently use momentum at POCA for PFDisplacedVertex momentum computations (same as #9703 from 74X)

It involves the following packages:

DataFormats/ParticleFlowReco

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@bachtis, @lgray this is something you requested to watch as well.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: e31c8c3
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9704/8254/summary.html

[slava77]

+1

for #9704 e31c8c3

• the same code change as in 74X version in consistently use momentum at POCA for PFDisplacedVertex momentum computations #9703
• jenkins tests pass and comparisons with baseline show no differences (there is a smaller set of tests that completed here in the baseline)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1