UNFINISHED - As long as this site is unfinished, you can find instructions in the attached talk

LHCb Stripping FAQ - Re-Stripping of MC in MicroDST format

Restrictions

In the case where your MC is persisted in the DST format, reconstruction information of the entire event is saved. This is not the case for MicroDST MC. It is unlikely, that re-stripping will result in the same data-sample that you would have got if you applied your stripping line during production. However, there is an algorithm in the MicroDST production that copies reconstruction information matched to signal MC-Particles. To check whether that algorithm ran during your production, see DUMMY. It is important to note that the candidates you can get out of your MicroDST either passed any stripping line or are truth-matched (associated to the signal MC particles). This is different to DST, where you can in principal get every candidate.

All calculation requiring information of more than the candidate only, like Isolation variables in RelatedInfoTools, cannot be performed during MicroDST Re-stripping and must be left out.

How To



Firstly, one has to check whether that algorithm ran during the production. Therefore, look at the Option files of your production (can be found in the bookkeeping) and check whether the "isMC" flag is set to true in stripMicroDSTElements and in stripMicroDSTStreamConf in the SelDSTWriter algorithm. In most cases the Writer is defined in

 "$APPCONFIGOPTS/DaVinci/DV-Stripping-MC-muDST.py" 
.

Check out Packages

To make the necessary changes to your stripping line (remove RelatedInfoTools and such, changing cuts), check out DaVinci and your desired stripping package (StrippingSelections or StrippingArchive):

 lb-dev DaVinci/vXXrXpX 
 cd ./DaVinciDev_vXXrXpX 
 git lb-use Stripping 
 git lb-checkout Stripping/vXXrXpX Phys/StrippingSelections (or Phys/StrippingArchive) 

Next up, you also need to checkout CommonParticles/CommonParticlesArchive:

-- NiklasStefanNolte - 2018-02-20

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Restripping_1.pdf r1 manage 994.2 K 2018-02-21 - 09:31 NiklasStefanNolte Until the site is finished, you can find some instructions here. Contact me (Niklas Nolte) if you encounter problems with this
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Topic revision: r3 - 2018-02-21 - NiklasStefanNolte
 
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