Notes on DNN for HIN b-tagging
Goal: train the b-tag discriminator in HIN-like conditions to improve ttbar-event like selection with respect to pileup jetsOn-going studies/results
Technical details
Software installation
Details on the HIN forest tree setup can be found here and on the DeepJet trees can be found in DeepJet. The setup needed to create the ntuples used to train the discriminator are the following:cmsrel CMSSW_7_5_8_patch3 cd CMSSW_7_5_8_patch3/src cmsenv git cms-merge-topic -u CmsHI:forest_$CMSSW_VERSION # Switch to the branch HEAD git remote add cmshi git@github.com:CmsHI/cmssw.git git fetch cmshi git checkout -b forest_$CMSSW_VERSION remotes/cmshi/forest_$CMSSW_VERSION scram b git clone git@github.com:pfs/topskim.git topskim
Creating the jets tree
Start by creating the HiForestTree with the baseline information on jets, tracks and centralitycd topskim cmsRun test/runOverPbPb_MIX_75X.pyTransform the HiForest tree to a jet by jet tree
root -l makeJetsSkim.C+\(\"test.root\",\"HiForestAOD.root\"\)The output file will contain a TTree called
jets with the following information
| Variable | Comment |
|---|---|
hibin |
centrality bin |
{run,lumi,event} |
event identifier |
jetIdx |
jet index in the original event |
{pt,eta,phi,m} |
jet 4 momentum |
rawpt |
uncorrected pT |
genpt |
pt of the matched gen jet |
tau{1,2,3} |
N-subjettiness |
csv{V1,V2} |
csv discriminators v1 and v2 |
trackSumJetDeltaR |
|
trackSip{2d,3d}SigAboveCharm |
impact parameter significance 2D,3D |
trackSip{2d,3d}ValAboveCharm |
impact parameter value 2D,3D |
svntrk |
#tracks associated to the secondary vertex |
sv{dl,dls,dl2d,dls2d} |
flight distances and associated significances for the sec. vertex |
sv{pt,m,mcorr} |
pt, mass and corrected mass of the sec. vertex |
sv{e2e,ptrel} |
ratio of energies and pTrel of the sec. vertex |
svtksumchi2 |
χ2 sum of the tracks attached to the sec. vertex |
svcharge |
charge of the secondary vertex |
svtkincone |
sec. vertex tracks inside the jet cone |
mu{pt2jet,ptrel} |
similar for a muon candidate |
mupt |
pt of the muon candidate |
mudr |
ΔR between muon and jet |
is{B,C,UDSG,Unmatched} |
flag if it's b,c, udsg or unmatched at gen level |
ntk |
tracks associated to jet |
tkdr |
ΔR to jet |
tkprob0 |
track probability (association to PV) |
tkip{2d,3d} |
impact parameter value 2D,3D |
tkip{2d,3d}sig |
significance of the impact parameter 2D,3D |
tkipdist2j |
distance to jet axis |
tkipclosest2j |
dca to primary vertex |
tkptratio |
fration of the momentum perpendicular to jet |
tk{pparratio} |
fraction of the momentum parallel to the jet |
Samples
| Sample | Name | DAS | Events | Jet trees | # jets | pT η |
|---|---|---|---|---|---|---|
| b-enriched | /Pythia6_bJet170_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
501748 | /store/cmst3/group/hintt/psilva/Pythia6_bJet170_pp502_Hydjet_MB |
||
/Pythia6_bJet120_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
490065 | /store/cmst3/group/hintt/psilva/Pythia6_bJet120_pp502_Hydjet_MB |
|||
/Pythia6_bJet100_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
492034 | /store/cmst3/group/hintt/psilva/Pythia6_bJet100_pp502_Hydjet_MB |
1758542 |  |
|
/Pythia6_bJet80_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
490167 | /store/cmst3/group/hintt/psilva/Pythia6_bJet80_pp502_Hydjet_MB |
766450 |  |
|
/Pythia6_bJet50_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
494596 | /store/cmst3/group/hintt/psilva/Pythia6_bJet50_pp502_Hydjet_MB |
660362 |  |
|
/Pythia6_bJet30_pp502_Hydjet_MB/HINPbPbWinter16DR-75X_mcRun2_HeavyIon_v13-v1/AODSIM |
das |
501715 | /store/cmst3/group/hintt/psilva/Pythia6_bJet30_pp502_Hydjet_MB |
782159 |  |
|
| tt | /store/cmst3/group/hintt/CMSSW_7_5_8_patch2/TT1l_172v5_PowhegV2_hvq/RECO |
n/a |
Useful links
| I | Attachment | History | Action | Size | Date | Who | Comment |
|---|---|---|---|---|---|---|---|
 png |
pthat100.png | r1 | manage | 12.9 K | 2017-04-07 - 09:41 | PedroSilva | |
| png |
pthat30.png | r1 | manage | 11.8 K | 2017-04-07 - 09:41 | PedroSilva | |
| png |
pthat50.png | r1 | manage | 11.4 K | 2017-04-07 - 09:41 | PedroSilva | |
| png |
pthat80.png | r1 | manage | 13.3 K | 2017-04-07 - 09:41 | PedroSilva |
Topic revision: r9 - 2017-04-07 - PedroSilva
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