#L1 Jet Energy Corrections/Calibrations (JEC)

The code in here calculates & tests corrections for jets produced by the Level 1 trigger.

This applies to:

• Legacy GCT
• Stage 1
• Stage 2

You will need to install first:

• If at Bristol: htcondenser python library for submitting HTCondor jobs at Bristol

# To re-run the RCT emulator you MUST use 742 or newer otherwise untold pain
# Check it has Boost v1.57 or newer for RCT calibs
# Also need Python 2.7 or newer for argparse module
cmsrel CMSSW_7_4_2
cd CMSSW_7_4_2/src
cmsenv

# Stage 1 emulator - do this first
git cms-addpkg L1Trigger/L1TCalorimeter
# L1DPG Ntuples package
git clone https://github.com/cms-l1-dpg/L1Ntuples.git L1TriggerDPG/L1Ntuples
# This package
git clone git@github.com:raggleton/L1JetEnergyCorrections.git L1Trigger/L1JetEnergyCorrections

# Build it all
scram b -j9
# to run unit tests
scram b runtests
# optional - to make documentation:
cd L1Trigger/L1JetEnergyCorrections/doc
doxygen Doxyfile # html documentation in html/index.html
# To build pdf documentation (produces latex/refman.pdf):
# cd latex; make

See the L1T TWiki page for recommended release and branch to get the L1TCalorimeter package: SWGuideL1TOfflineDev and the L1CaloUpgradeOfflineAnalysis Twiki page: L1CaloUpgradeOfflineAnalysis, and this GitHub issue: issue164

Note that we now use the L1Ntuples included in the package, so no need to get the L1DPG NTuple package (which is now deprecated).

# follow instructions for CMSSW, etc

#  Get this package
git clone git@github.com:raggleton/L1JetEnergyCorrections.git L1Trigger/L1JetEnergyCorrections
scram b -j9
# to run unit tests
scram b runtests

For instructions about deriving new calibrations, see derivation.md.

For instructions about applying new calibrations, see applying.md.

For instructions about testing the calibration & performance, see performance.md.

• [GCT/Stage1] For all CMSSW releases up to and including 7_4_X, there is a bug in the standard Stage 1 emulator sequence that auto loads the old RCT LUTs: https://github.com/cms-sw/cmssw/blob/CMSSW_7_4_2/L1Trigger/L1TCalorimeter/python/L1TCaloStage1_PPFromRaw_cff.py#L9 To get around this, basically copy and paste that file's contents without that line...sigh. Should be fixed in 7_5_X though.

• [GCT/Stage1] For new RCT calibs, use 7_4_2 or better - check with https://twiki.cern.ch/twiki/bin/viewauth/CMS/RCTCalibrationTP

• [GCT/Stage1] WARNING: in CMSSW_7_4_5 and later, the L1RCTProducer uses the new AMC13 FED IDs for HF. So if you run over Spring15 MC or earlier, you'll need to change the FEDs back, or end up with nothing in the HF: https://github.com/cms-sw/cmssw/commit/8b127a6660bdb557ccc2241db022687d3c2936d0

• [GCT/Stage1] Always double check with the l1RCTParametersTest module that you are running the correct RCT calibs - if in doubt, check with Laura/Maria/Aaron