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cms-nanoAOD / cmssw

CMS NanoAOD software integration repository
http://cms-sw.github.io/
Apache License 2.0
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Nan in Photons #566

Closed mariadalfonso closed 1 year ago

mariadalfonso commented 3 years ago

we have many nan in photons nanoAOD-V8

root://xrootd-cms.infn.it//store/data/Run2016G/MET/NANOAOD/UL2016_MiniAODv1_NanoAODv2-v1/270000/4D848321-6D1D-F949-A95E-D4A8C263906D.root

run:lumi:event 278820:518:939276241

root://xrootd-cms.infn.it//store/data/Run2016G/MET/NANOAOD/UL2016_MiniAODv1_NanoAODv2-v1/270000/CE684FF8-BA3F-244B-A841-661D88AE3163.root

run:lumi:event 278820:328:587668886

root://xrootd-cms.infn.it///store/data/Run2016G/MET/NANOAOD/UL2016_MiniAODv1_NanoAODv2-v1/280000/59021744-BDFC-3C4B-AD8F-78EC96AD2F0F.root

run:lumi:event 280007:8:8839035 run:lumi:event 280007:8:9609024 run:lumi:event 280007:8:8691064

Also the size of photons is peculiar. in some event of 59021744-BDFC-3C4B-AD8F-78EC96AD2F0F.root we have clusters of 500-700 photons

I have seen this in both data and QCD/ttbar MC

mariadalfonso commented 3 years ago

@sroychow @jainshilpi

please have a look, we need a fix for v9

jainshilpi commented 3 years ago

@mariadalfonso

About the events here: root://xrootd-cms.infn.it///store/data/Run2016G/MET/NANOAOD/UL2016_MiniAODv1_NanoAODv2-v1/280000/59021744-BDFC-3C4B-AD8F-78EC96AD2F0F.root

run:lumi:event 280007:8:8839035 run:lumi:event 280007:8:9609024 run:lumi:event 280007:8:8691064

We looked at one of the events run:lumi:event 280007:8:8839035 and the event looks like this in the fireworks: https://cernbox.cern.ch/index.php/s/BYLmBjeYOlMhS8p

Checking with ECAL DPG (Fabrice, Simone and David), it seem that ECAL was bad in this run. Also in the central JSON (https://cms-service-dqmdc.web.cern.ch/CAF/certification/Collisions16/13TeV/Legacy_2016/Cert_271036-284044_13TeV_Legacy2016_Collisions16_JSON.txt), this run is not present.

We will confirm about the nan problem by tomorrow.

vlimant commented 1 year ago

part of cleanup issue : @jainshilpi , has this issue been handled?

jainshilpi commented 1 year ago

Hi @vlimant, at that we scanned those events and we did not find any nan values - neither in isolation variables nor in any of the shower shape variables. It was also later checked by @mariadalfonso and she also confirmed about that. So I suppose this is already handled. But I let @mariadalfonso comment on this. If there are further problems, then I suppose this can be addressed to the current e/gamma POG conveners. Thanks, Shilpi