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Update HI vtx smearing according to newly updated beta*. #11138

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merged 1 commit into from Sep 17, 2015
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Update HI vtx smearing according to newly updated beta*. #11138

merged 1 commit into from Sep 17, 2015

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mandrenguyen
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The beam conditions expected for the PbPb run have been changed.
See Tiziano's slides from the WGM:
https://indico.cern.ch/event/442020/contribution/0/attachments/1148526/1647556/WGM241.pdf

This PR updates the beta*.
I also took the opportunity to shift the beamspot centroid to the current pp locations.
Last time around in 2011, the centroid stayed fairly close between pp and PbPb, so this should be a better assumption than the origin.

This new vertex smearing is not the default, so there will be no change in relval.
We propose to switch this to the default when we reevaluate the reco beamspot and update the GT in a PR to come shortly, once we can produce some samples with this vertex smearing.

A PR for 75X is also coming.

@cmsbuild cmsbuild added this to the Next CMSSW_7_6_X milestone Sep 4, 2015
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cmsbuild commented Sep 4, 2015

A new Pull Request was created by @mandrenguyen for CMSSW_7_6_X.

Update HI vtx smearing according to newly updated beta*.

It involves the following packages:

Configuration/StandardSequences
IOMC/EventVertexGenerators

@cmsbuild, @civanch, @franzoni, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @cerati, @dgulhan 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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If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@Degano you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

@mandrenguyen mandrenguyen mentioned this pull request Sep 4, 2015
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civanch commented Sep 7, 2015

please test

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civanch commented Sep 7, 2015

+1

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cmsbuild commented Sep 7, 2015

The tests are being triggered in jenkins.

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cmsbuild commented Sep 7, 2015

+1
Tested at: 3827b46
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11138/7926/summary.html

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cmsbuild commented Sep 7, 2015

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11138/7926/summary.html

davidlange6 added a commit that referenced this pull request Sep 17, 2015
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Merge pull request #11138 from mandrenguyen/updateHiVtxSmearing76X
dce4ad8 
Update HI vtx smearing according to newly updated beta*.
@davidlange6 davidlange6 merged commit dce4ad8 into cms-sw:CMSSW_7_6_X Sep 17, 2015
@mandrenguyen mandrenguyen deleted the updateHiVtxSmearing76X branch March 4, 2022 10:12
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