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df102_NanoAODDimuonAnalysis.C
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1/// \file
2/// \ingroup tutorial_dataframe
3/// \notebook -js
4/// Show how NanoAOD files can be processed with RDataFrame.
5///
6/// This tutorial illustrates how NanoAOD files can be processed with ROOT
7/// dataframes. The NanoAOD-like input files are filled with 66 mio. events
8/// from CMS OpenData containing muon candidates part of 2012 dataset
9/// ([DOI: 10.7483/OPENDATA.CMS.YLIC.86ZZ](http://opendata.cern.ch/record/6004)
10/// and [DOI: 10.7483/OPENDATA.CMS.M5AD.Y3V3](http://opendata.cern.ch/record/6030)).
11/// The macro matches muon pairs and produces an histogram of the dimuon mass
12/// spectrum showing resonances up to the Z mass.
13/// Note that the bump at 30 GeV is not a resonance but a trigger effect.
14///
15/// More details about the dataset can be found on [the CERN Open Data portal](http://opendata.web.cern.ch/record/12341).
16///
17/// \macro_image
18/// \macro_code
19/// \macro_output
20///
21/// \date August 2018
22/// \author Stefan Wunsch (KIT, CERN)
23
24#include "ROOT/RDataFrame.hxx"
25#include "ROOT/RVec.hxx"
26#include "TCanvas.h"
27#include "TH1D.h"
28#include "TLatex.h"
29#include "TStyle.h"
30
31using namespace ROOT::VecOps;
32
34{
35 // Enable multi-threading
37
38 // Create dataframe from NanoAOD files
39 ROOT::RDataFrame df("Events", "root://eospublic.cern.ch//eos/opendata/cms/derived-data/AOD2NanoAODOutreachTool/Run2012BC_DoubleMuParked_Muons.root");
40
41 // For simplicity, select only events with exactly two muons and require opposite charge
42 auto df_2mu = df.Filter("nMuon == 2", "Events with exactly two muons");
43 auto df_os = df_2mu.Filter("Muon_charge[0] != Muon_charge[1]", "Muons with opposite charge");
44
45 // Compute invariant mass of the dimuon system
46 auto df_mass = df_os.Define("Dimuon_mass", InvariantMass<float>, {"Muon_pt", "Muon_eta", "Muon_phi", "Muon_mass"});
47
48 // Make histogram of dimuon mass spectrum. Note how we can set title and axis labels in one go
49 auto h = df_mass.Histo1D({"Dimuon_mass", "Dimuon mass;m_{#mu#mu} (GeV);N_{Events}", 30000, 0.25, 300}, "Dimuon_mass");
50
51 // Request cut-flow report
52 auto report = df_mass.Report();
53
54 // Produce plot
56 auto c = new TCanvas("c", "", 800, 700);
57 c->SetLogx(); c->SetLogy();
58
59 h->GetXaxis()->SetTitleSize(0.04);
60 h->GetYaxis()->SetTitleSize(0.04);
61 h->DrawClone();
62
63 TLatex label; label.SetNDC(true);
64 label.DrawLatex(0.175, 0.740, "#eta");
65 label.DrawLatex(0.205, 0.775, "#rho,#omega");
66 label.DrawLatex(0.270, 0.740, "#phi");
67 label.DrawLatex(0.400, 0.800, "J/#psi");
68 label.DrawLatex(0.415, 0.670, "#psi'");
69 label.DrawLatex(0.485, 0.700, "Y(1,2,3S)");
70 label.DrawLatex(0.755, 0.680, "Z");
71 label.SetTextSize(0.040); label.DrawLatex(0.100, 0.920, "#bf{CMS Open Data}");
72 label.SetTextSize(0.030); label.DrawLatex(0.630, 0.920, "#sqrt{s} = 8 TeV, L_{int} = 11.6 fb^{-1}");
73
74 c->SaveAs("dimuon_spectrum.pdf");
75
76 // Print cut-flow report
77 report->Print();
78}
79
80int main()
81{
83}
int main()
Definition Prototype.cxx:12
#define c(i)
Definition RSha256.hxx:101
#define h(i)
Definition RSha256.hxx:106
R__EXTERN TStyle * gStyle
Definition TStyle.h:413
ROOT's RDataFrame offers a high level interface for analyses of data stored in TTree,...
virtual void SetTextFont(Font_t tfont=62)
Set the text font.
Definition TAttText.h:46
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition TAttText.h:47
The Canvas class.
Definition TCanvas.h:23
To draw Mathematical Formula.
Definition TLatex.h:18
TLatex * DrawLatex(Double_t x, Double_t y, const char *text)
Make a copy of this object with the new parameters And copy object attributes.
Definition TLatex.cxx:1941
virtual void SaveAs(const char *filename="", Option_t *option="") const
Save this object in the file specified by filename.
Definition TObject.cxx:671
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition TStyle.cxx:1589
virtual void SetNDC(Bool_t isNDC=kTRUE)
Set NDC mode on if isNDC = kTRUE, off otherwise.
Definition TText.cxx:813
void EnableImplicitMT(UInt_t numthreads=0)
Enable ROOT's implicit multi-threading for all objects and methods that provide an internal paralleli...
Definition TROOT.cxx:527