JetCorrectorParameters: No definitions found!!! with 2016 FastSim nanoaod samples.

[cghuh]

Dear all,

I have issues when I use nanoaod tools with CMSSW_10_2_16_UL. This is the script that I use: https://github.com/ssekmen/BoostAnalyzer17/blob/master/scripts/postproc.py
and the run command is "python scripts/postproc.py test.root root://cms-xrd-global.cern.ch//store/mc/RunIISummer16NanoAODv6/SMS-T2bt_TuneCUETP8M1_13TeV-madgraphMLM-pythia8/NANOAODSIM/PUSummer16v3Fast_Nano25Oct2019_102X_mcRun2_asymptotic_v7-v1/270000/53C78EE0-2E9D-C74D-8368-C955BADDC540.root ".

When I did, I have a segmentation fault. This is the log message that I gave.
nanoaodtoolerr.log
It occurs only in 2016 fastsim samples.

Can you give me some comments about this issue?

Cheers,
Changgi

[cghuh]

I checked again very carefully, I found that segmentation fault coming from AK8PFPuppi case of this line : https://github.com/ssekmen/BoostAnalyzer17/blob/619ae8367f01c7bd05f459dc236b5d6cfb2f5804/scripts/postproc.py#L63

It use JEC : Spring16_25nsFastSimV1_MC, But I found there are latest one(Summer16_FastSimV1_MC).

[cghuh]

I fix the issue. I suggest to fix

nanoAOD-tools/python/postprocessing/modules/jme/jetmetHelperRun2.py

Line 18 in 079c9e1

'2016': 'Spring16_25nsFastSimV1_MC',

Spring16_25nsFastSimV1_MC to Summer16_FastSimV1_MC.

[mariadalfonso]

Would be good if @kirschen @juska confirm there Fast Sim Tag.

Then please make a PR

[juska]

I can confirm that Summer16_FastSim_V1_MC is the latest FastSim MC JEC for the Summer16 MC campaign: https://twiki.cern.ch/twiki/bin/viewauth/CMS/JECDataMC#Recommended_for_MC

This version includes JEC for all four supported algorithms, so it should fix the "No definitions found" error. In Spring16_25nsFastSimV1_MC there's no PUPPI JEC at all.