-- CandanDozen - 2022-01-06

This is a description of the NanoAOD framework for advanced development of Tprime and SingleTop analyses for RUNII.

The code consists of the main class NanoAODAnalyzerrdframe and two child classes TprimeAnalayser and SingleTopAnalyser There is one .h header file and one .cpp source file for it. The class has several methods:

Object definitions (These objects could be electrons, muons, jets, missing energy, etc...) Additional derived variables definition (defineMoreVars) Histogram definitions (bookHists) Selections (defineCuts) Some utility methods/functions (gen4vec, readjson, removeOverlaps, helper_1DHistCreator, createHists)

Users should modify: object definitions, define additional variables, histogram definitions, selections.

RECIPE: Event Selection: The first event selection requirements: select triggers and minimal selection criteria. The "defineCuts" function in "TprimeAnalyser" is a Filter method of RDF. As an example In the "definecuts" function, we require that each event have one muon.


void TprimeAnalyser::defineCuts() addCuts("numberof_muon_pass = 1 && numberof_veto_electron_pass = 0 && numberof_veto_muons == 0","0");

Users should add more Filter statements according to the analysis requirements.

Lepton Selection Criteria: What constitutes a good electron? For any physics object, the selection criteria typically include:

kinematic constraints (momentum, pseudorapidity, masses of object pairs, etc) identification requirements (loose, medium, tight quality levels). We have stored all of these labels as boolean pass/fail variables. isolations requirements (loose, medium, tight isolation levels).

Select Electrons based on ID selection: Electron ID reference pages:

Run II recomendation - cutbased: https://twiki.cern.ch/twiki/bin/view/CMS/CutBasedElectronIdentificationRun2 Run II recommendation: https://twiki.cern.ch/twiki/bin/viewauth/CMS/EgammaRunIIRecommendations


std::string TprimeAnalyser::ElectronID(std::string cutbasedID){

if(_isRun17 || _isRun18) { if (cutbasedID=="Loose"){ Electron_cutBasedID=2; ......other cuts if it is different than working points..

}else if(cutbasedID=="Medium"){ Electron_cutBasedID=3; ......other cuts if it is different than working points..

}else if(cutbasedID=="Tight"){ Electron_cutBasedID=4; ......other cuts if it is different than working points.. } } //write output in a string format with selection criteria on electron momentum, pseudorapidity, identification level, and isolation level. string output = Form("Electron_pt>%f && abs(Electron_eta)<%f && Electron_cutBased == %d && ((abs(Electron_deltaEtaSC<=%f) && abs(Electron_dxy) < %f && abs(Electron_dz) < %f ) || (abs(Electron_deltaEtaSC>%f) && abs(Electron_dxy) < %f && abs(Electron_dz) < %f))",cutdb->Md_Electron_pT,cutdb->Md_Electron_eta,Electron_cutBasedID,Cut_Electron_deltaEtaSC,Cut_dxy,Cut_dz,Cut_Electron_deltaEtaSC,Cut_dxy,Cut_dz); return output;

Find Good Electrons: Define goodelectrons/new variables in the "selectElectrons" function as follow:

void TprimeAnalyser::selectElectrons(){ _rlm = _rlm.Define("goodElectrons", ElectronID("Loose")); _rlm = _rlm.Define("Selected_electron_pt", "Electron_pt[goodElectrons]") // define new variables .... }

Baseline muon selections: https://twiki.cern.ch/twiki/bin/view/CMS/SWGuideMuonSelection

Jet Identification for the 13 TeV UL data:


useful links for analysis.

Electrons https://twiki.cern.ch/twiki/bin/view/CMS/EgammaPOG https://twiki.cern.ch/twiki/bin/view/CMS/EgammaRunIIRecommendations https://twiki.cern.ch/twiki/bin/view/CMS/EgammaIDRecipesRun2 https://twiki.cern.ch/twiki/bin/view/CMS/CutBasedElectronIdentificationRun2 Muons https://twiki.cern.ch/twiki/bin/view/CMS/MuonPOG https://twiki.cern.ch/twiki/bin/view/CMS/MuonHLT Taus https://twiki.cern.ch/twiki/bin/view/CMS/Tau https://twiki.cern.ch/twiki/bin/viewauth/CMS/TauIDRecommendationForRun2 https://twiki.cern.ch/twiki/bin/view/CMS/TauTrigger https://github.com/cms-tau-pog/TauIDSFs Jet/MET https://twiki.cern.ch/twiki/bin/view/CMS/JetID https://twiki.cern.ch/twiki/bin/view/CMS/MissingETUncertaintyPrescription https://twiki.cern.ch/twiki/bin/view/CMS/JERCReference https://twiki.cern.ch/twiki/bin/view/CMS/JECDataMC https://twiki.cern.ch/twiki/bin/view/CMS/JetResolution https://twiki.cern.ch/twiki/bin/viewauth/CMS/JetEnergyScale https://twiki.cern.ch/twiki/bin/view/CMS/IntroToJEC B-jets https://twiki.cern.ch/twiki/bin/viewauth/CMS/BtagPOG https://twiki.cern.ch/twiki/bin/view/CMS/BtagRecommendation https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideBTagging

How to create a website with nanoAOD content

To create nice websites like this one with the content of nanoAOD, use the inspectNanoFile.py file from the PhysicsTools/nanoAOD package as:

cmsrel CMSSW_11_2_1 cd CMSSW_11_2_1/src cmsenv git cms-addpkg PhysicsTools/NanoAOD/ cd CMSSW_11_2_1/src/PhysicsTools/NanoAOD/test

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