Rivet analyses referenceCMS_2014_I1303894Differential cross-section of $W$ bosons + jets in $pp$ collisions at $\sqrt{s}=7$ TeVExperiment: CMS (LHC) Inspire ID: 1303894 Status: VALIDATED Authors:
Beam energies: (3500.0, 3500.0) GeV Run details:
A study of jet production in association with $W$ bosons has been performed, in events with the $W$ decaying to a muon. Jets are required to have $pT > 30$ GeV and $|eta| < 2.4$. Muons are required to have $pT > 25$ and $|eta| < 2.1$. Jets are only considered if they are separated from the muon by $\Delta{R} > 0.5$. Muons are dressed with photons in a cone of $0.1$ around the muon. Source code: CMS_2014_I1303894.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/FastJets.hh"
5#include "Rivet/Projections/VetoedFinalState.hh"
6#include "Rivet/Projections/PromptFinalState.hh"
7#include "Rivet/Projections/InvMassFinalState.hh"
8#include "Rivet/Projections/MissingMomentum.hh"
9#include "Rivet/Projections/LeptonFinder.hh"
10
11namespace Rivet {
12
13
14 /// @brief Differential cross-section of W bosons + jets in pp collisions at sqrt(s)=7 TeV
15 ///
16 /// @author Darin Baumgartel (darinb@cern.ch)
17 ///
18 /// Based on Rivet analysis originally created by Anil Singh (anil@cern.ch), Lovedeep Saini (lovedeep@cern.ch)
19 class CMS_2014_I1303894 : public Analysis {
20 public:
21
22 /// Constructor
23 CMS_2014_I1303894()
24 : Analysis("CMS_2014_I1303894")
25 { }
26
27
28 // Book histograms and initialise projections before the run
29 void init() {
30 // Prompt leptons only, no test on nu flavour.
31 // Projections
32 const FinalState fs;
33 declare(fs, "FS");
34
35 MissingMomentum missing(fs);
36 declare(missing, "MET");
37
38 PromptFinalState pfs(fs);
39 IdentifiedFinalState bareMuons(pfs);
40 bareMuons.acceptIdPair(PID::MUON);
41 LeptonFinder muonClusters(bareMuons, fs, -1); //, Cuts::open(), false, false);
42 declare(muonClusters, "muonClusters");
43
44 VetoedFinalState jetFS(fs);
45 jetFS.addVetoOnThisFinalState(muonClusters);
46 jetFS.vetoNeutrinos();
47 FastJets jetprojection(jetFS, JetAlg::ANTIKT, 0.5);
48 declare(jetprojection, "Jets");
49
50 // Histograms
51 book(_histDPhiMuJet1 ,1,1,1);
52 book(_histDPhiMuJet2 ,2,1,1);
53 book(_histDPhiMuJet3 ,3,1,1);
54 book(_histDPhiMuJet4 ,4,1,1);
55
56 book(_histEtaJet1 ,5,1,1);
57 book(_histEtaJet2 ,6,1,1);
58 book(_histEtaJet3 ,7,1,1);
59 book(_histEtaJet4 ,8,1,1);
60
61 book(_histHT1JetInc ,9,1,1);
62 book(_histHT2JetInc ,10,1,1);
63 book(_histHT3JetInc ,11,1,1);
64 book(_histHT4JetInc ,12,1,1);
65
66 book(_histJet30MultExc ,13,1,1);
67 book(_histJet30MultInc ,14,1,1);
68
69 book(_histPtJet1 ,15,1,1);
70 book(_histPtJet2 ,16,1,1);
71 book(_histPtJet3 ,17,1,1);
72 book(_histPtJet4 ,18,1,1);
73
74 // Counters
75 book(_n_1jet, "n_1jet");
76 book(_n_2jet, "n_2jet");
77 book(_n_3jet, "n_3jet");
78 book(_n_4jet, "n_4jet");
79 book(_n_inclusivebinsummation, "n_inclusivebinsummation");
80 }
81
82
83 void analyze(const Event& event) {
84 // Get the dressed muon
85 const LeptonFinder& muonClusters = apply<LeptonFinder>(event, "muonClusters");
86 int nmu = muonClusters.dressedLeptons().size();
87 if (nmu < 1) vetoEvent;
88 DressedLepton dressedmuon = muonClusters.dressedLeptons()[0];
89 if (dressedmuon.momentum().abseta() > 2.1) vetoEvent;
90 if (dressedmuon.momentum().pT() < 25.0*GeV) vetoEvent;
91
92 // Check that the muon and neutrino are not decay products of tau
93 if (dressedmuon.bareLepton().hasAncestorWith(Cuts::pid == PID::TAU)) vetoEvent;
94 if (dressedmuon.bareLepton().hasAncestorWith(Cuts::pid == -PID::TAU)) vetoEvent;
95
96 // Get the missing momentum
97 const MissingMomentum& met = apply<MissingMomentum>(event, "MET");
98 const double ptmet = met.visibleMomentum().pT();
99 const double phimet = (-met.visibleMomentum()).phi();
100
101 // Calculate MET and MT(mu,MET), and remove events with MT < 50 GeV
102 const double ptmuon = dressedmuon.pT();
103 const double phimuon = dressedmuon.phi();
104 const double mt_mumet = sqrt(2*ptmuon*ptmet*(1.0 - cos(phimet-phimuon)));
105
106 // Remove events in MT < 50 region
107 if (mt_mumet < 50*GeV) vetoEvent;
108
109 // Loop over jets and fill pt/eta/phi quantities in vectors
110 const Jets& jets_filtered = apply<FastJets>(event, "Jets").jetsByPt();
111 vector<float> finaljet_pT_list, finaljet_eta_list, finaljet_phi_list;
112 double htjets = 0.0;
113 for (size_t ii = 0; ii < jets_filtered.size(); ++ii) {
114 // Jet pT/eta/phi
115 double jet_pt = jets_filtered[ii].pT();
116 double jet_eta = jets_filtered[ii].eta();
117 double jet_phi = jets_filtered[ii].phi();
118
119 // Kinemetic cuts for jet acceptance
120 if (fabs(jet_eta) > 2.4) continue;
121 if (jet_pt < 30.0*GeV) continue;
122 if (deltaR(dressedmuon, jets_filtered[ii]) < 0.5) continue;
123
124 // Add jet to jet list and increases the HT variable
125 finaljet_pT_list.push_back(jet_pt);
126 finaljet_eta_list.push_back(jet_eta);
127 finaljet_phi_list.push_back(jet_phi);
128 htjets += fabs(jet_pt);
129 }
130
131
132 // Filling of histograms:
133 // Fill as many jets as there are into the exclusive jet multiplicity
134 if (!finaljet_pT_list.empty())
135 _histJet30MultExc->fill(finaljet_pT_list.size());
136
137 for (size_t ij = 0; ij < finaljet_pT_list.size(); ++ij) {
138 _histJet30MultInc->fill(ij+1);
139 _n_inclusivebinsummation->fill();
140 }
141
142 if (finaljet_pT_list.size() >= 1) {
143 _histPtJet1->fill(finaljet_pT_list[0]);
144 _histEtaJet1->fill(fabs(finaljet_eta_list[0]));
145 _histDPhiMuJet1->fill(deltaPhi(finaljet_phi_list[0], phimuon));
146 _histHT1JetInc->fill(htjets);
147 _n_1jet->fill();
148 }
149
150 if (finaljet_pT_list.size() >= 2) {
151 _histPtJet2->fill(finaljet_pT_list[1]);
152 _histEtaJet2->fill(fabs(finaljet_eta_list[1]));
153 _histDPhiMuJet2->fill(deltaPhi(finaljet_phi_list[1], phimuon));
154 _histHT2JetInc->fill(htjets);
155 _n_2jet->fill();
156 }
157
158 if (finaljet_pT_list.size() >= 3) {
159 _histPtJet3->fill(finaljet_pT_list[2]);
160 _histEtaJet3->fill(fabs(finaljet_eta_list[2]));
161 _histDPhiMuJet3->fill(deltaPhi(finaljet_phi_list[2], phimuon));
162 _histHT3JetInc->fill(htjets);
163 _n_3jet->fill();
164 }
165
166 if (finaljet_pT_list.size() >=4 ) {
167 _histPtJet4->fill(finaljet_pT_list[3]);
168 _histEtaJet4->fill(fabs(finaljet_eta_list[3]));
169 _histDPhiMuJet4->fill(deltaPhi(finaljet_phi_list[3], phimuon));
170 _histHT4JetInc-> fill(htjets);
171 _n_4jet->fill();
172 }
173
174 }
175
176
177 // Finalize the histograms.
178 void finalize() {
179
180 const double inclusive_cross_section = crossSection()/picobarn;
181 const double norm_1jet_histo = inclusive_cross_section*dbl(*_n_1jet)/sumOfWeights();
182 const double norm_2jet_histo = inclusive_cross_section*dbl(*_n_2jet)/sumOfWeights();
183 const double norm_3jet_histo = inclusive_cross_section*dbl(*_n_3jet)/sumOfWeights();
184 const double norm_4jet_histo = inclusive_cross_section*dbl(*_n_4jet)/sumOfWeights();
185 const double norm_incmultiplicity = inclusive_cross_section*dbl(*_n_inclusivebinsummation)/sumOfWeights();
186
187 normalize(_histJet30MultExc, norm_1jet_histo);
188 normalize(_histJet30MultInc, norm_incmultiplicity);
189
190 normalize(_histPtJet1, norm_1jet_histo);
191 normalize(_histHT1JetInc, norm_1jet_histo);
192 normalize(_histEtaJet1, norm_1jet_histo);
193 normalize(_histDPhiMuJet1, norm_1jet_histo);
194
195 normalize(_histPtJet2, norm_2jet_histo);
196 normalize(_histHT2JetInc, norm_2jet_histo);
197 normalize(_histEtaJet2, norm_2jet_histo);
198 normalize(_histDPhiMuJet2, norm_2jet_histo);
199
200 normalize(_histPtJet3, norm_3jet_histo);
201 normalize(_histHT3JetInc, norm_3jet_histo);
202 normalize(_histEtaJet3, norm_3jet_histo);
203 normalize(_histDPhiMuJet3, norm_3jet_histo);
204
205 normalize(_histPtJet4, norm_4jet_histo);
206 normalize(_histHT4JetInc, norm_4jet_histo);
207 normalize(_histEtaJet4, norm_4jet_histo);
208 normalize(_histDPhiMuJet4, norm_4jet_histo);
209 }
210
211
212 private:
213
214 Histo1DPtr _histJet30MultExc, _histJet30MultInc;
215 Histo1DPtr _histPtJet1, _histPtJet2, _histPtJet3, _histPtJet4;
216 Histo1DPtr _histEtaJet1, _histEtaJet2, _histEtaJet3, _histEtaJet4;
217 Histo1DPtr _histDPhiMuJet1, _histDPhiMuJet2, _histDPhiMuJet3, _histDPhiMuJet4;
218 Histo1DPtr _histHT1JetInc, _histHT2JetInc, _histHT3JetInc, _histHT4JetInc;
219
220 CounterPtr _n_1jet, _n_2jet, _n_3jet, _n_4jet, _n_inclusivebinsummation;
221
222 };
223
224
225 RIVET_DECLARE_PLUGIN(CMS_2014_I1303894);
226
227}
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