Rivet analyses referenceCMS_2017_I1594909Search for SUSY in multijet events with missing transverse momentum in $pp$ collisions at 13 TeVExperiment: CMS (LHC) Inspire ID: 1594909 Status: VALIDATED Authors:
Beam energies: (6500.0, 6500.0) GeV Run details:
A search for supersymmetry based on multijet events with large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 13\,\text{TeV}$. The data, corresponding to an integrated luminosity of 35.9/fb, were collected with the CMS detector at the CERN LHC in 2016. The analysis utilizes four-dimensional exclusive search regions defined in terms of the number of jets, the number of tagged bottom-quark jets, the scalar sum of jet transverse momenta, and the magnitude of the vector sum of jet transverse momenta. This coding presents the fully detailed 174 signal regions, as well as 12 aggregate signal regions. Source code: CMS_2017_I1594909.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/FastJets.hh"
5#include "Rivet/Projections/ChargedFinalState.hh"
6#include "Rivet/Projections/VisibleFinalState.hh"
7#include "Rivet/Projections/MissingMomentum.hh"
8#include "Rivet/Projections/SmearedParticles.hh"
9#include "Rivet/Projections/SmearedJets.hh"
10#include "Rivet/Projections/SmearedMET.hh"
11#include "Rivet/Tools/Cutflow.hh"
12#include <tuple>
13
14namespace Rivet {
15
16
17 /// CMS search for SUSY with multijet + MET signatures in 36/fb of 13 TeV pp data
18 class CMS_2017_I1594909 : public Analysis {
19 public:
20
21 /// Constructor
22 RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2017_I1594909);
23
24
25 /// @name Analysis methods
26 /// @{
27
28 /// Book histograms and initialise projections before the run
29 void init() {
30
31 VisibleFinalState pfall;
32 declare(pfall, "PFAll");
33 ChargedFinalState pfchg(Cuts::abseta < 2.5);
34 declare(pfchg, "PFChg");
35
36 FastJets jets(FinalState(Cuts::abseta < 4.9), JetAlg::ANTIKT, 0.4);
37 SmearedJets recojets(jets, JET_SMEAR_CMS_RUN2, [](const Jet& j){ return j.bTagged() ? 0.55 : j.cTagged() ? 0.12 : 0.016; });
38 declare(recojets, "Jets");
39
40 FinalState electrons(Cuts::abspid == PID::ELECTRON && Cuts::abseta < 2.5);
41 SmearedParticles recoelectrons(electrons, ELECTRON_EFF_CMS_RUN2);
42 declare(recoelectrons, "Electrons");
43
44 FinalState muons(Cuts::abspid == PID::MUON && Cuts::abseta < 2.4);
45 SmearedParticles recomuons(muons, MUON_EFF_CMS_RUN2);
46 declare(recomuons, "Muons");
47
48 VisibleFinalState calofs(Cuts::abseta < 4.9 && Cuts::abspid != PID::MUON);
49 MissingMomentum met(calofs);
50 SmearedMET recomet(met, MET_SMEAR_CMS_RUN2);
51 declare(recomet, "MET");
52
53
54 // Book counters, into a map of 3 indices since the global index is not obvious to calculate
55 size_t i = 0;
56 for (int j = 1; j <= 5; ++j) {
57 for (int b = 1; b <= 4; ++b) {
58 if (j == 1 && b == 4) continue;
59 for (int k = 1; k <= 10; ++k) {
60 if (j > 3 && (k == 1 || k == 4)) continue;
61 stringstream s; s << "count_" << (i+1); // << "_" << j << b << k;
62 book(_counts[std::make_tuple(j,b,k)], s.str());
63 i += 1;
64 }
65 }
66 }
67 MSG_DEBUG("Booked " << i << " signal regions (should be 174)");
68 // Aggregate SR counters
69 for (size_t i = 0; i < 12; ++i)
70 book(_counts_agg[i], "count_agg_" + toString(i+1));
71
72
73 // Book cut-flow
74 book(_flow, "Presel", {"Njet>=2", "HT>300", "HTmiss>300",
75 "Nmuon=0", "Nmuisotrk=0", "Nelec=0", "Nelisotrk=0", "Nhadisotrk=0",
76 "dPhi_miss,j1>0.5", "dPhi_miss,j2>0.5", "dPhi_miss,j3>0.3", "dPhi_miss,j4>0.3"
77 });
78 }
79
80
81 /// Perform the per-event analysis
82 void analyze(const Event& event) {
83
84 _flow->fillinit();
85
86 // Find leptons and isolation particles
87 const Particles elecs = apply<ParticleFinder>(event, "Electrons").particlesByPt();
88 const Particles mus = apply<ParticleFinder>(event, "Muons").particlesByPt();
89 const Particles pfall = apply<ParticleFinder>(event, "PFAll").particlesByPt();
90 const Particles pfiso = select(pfall, [](const Particle& p){ return p.isHadron() || p.pid() == PID::PHOTON; });
91
92 // Find isolated leptons
93 const Particles isoleps = select(elecs+mus, [&](const Particle& l){
94 const double dR = l.pT() < 50*GeV ? 0.2 : l.pT() < 200*GeV ? 10*GeV/l.pT() : 0.05;
95 const double sumpt = sum(select(pfiso, deltaRLess(l, dR)), Kin::pT, 0.0);
96 return sumpt/l.pT() < (l.abspid() == PID::ELECTRON ? 0.1 : 0.2); //< different I criteria for e and mu
97 });
98
99 // Find other isolated tracks
100 const Particles pfchg = apply<ParticleFinder>(event, "PFChg").particlesByPt();
101 const Particles isochgs = select(pfchg, [&](const Particle& t){
102 if (t.abseta() > 2.4) return false;
103 if (any(isoleps, deltaRLess(t, 0.01))) return false; //< don't count isolated leptons here
104 const double sumpt = sum(select(pfchg, deltaRLess(t, 0.3)), Kin::pT, -t.pT());
105 return sumpt/t.pT() < ((t.abspid() == PID::ELECTRON || t.abspid() == PID::MUON) ? 0.2 : 0.1);
106 });
107
108 // Find and isolate jets
109 const Jets jets = apply<JetFinder>(event, "Jets").jetsByPt(Cuts::pT > 30*GeV);
110 const Jets cjets = select(jets, Cuts::abseta < 2.4);
111 const Jets isojets = cjets; //discardIfAnyDeltaRLess(cjets, elecs+mus, 0.4);
112 const int njets = isojets.size();
113 const Jets isobjets = select(isojets, hasBTag());
114 const int nbjets = isobjets.size();
115 MSG_DEBUG("Njets = " << jets.size() << ", Nisojets = " << njets << ", Nbjets = " << nbjets);
116
117 // Calculate HT, HTmiss, and pTmiss quantities
118 const double ht = sum(jets, Kin::pT, 0.0);
119 const Vector3 vhtmiss = -sum(jets, pTvec, Vector3());
120 const double htmiss = vhtmiss.perp();
121 const Vector3& vptmiss = -apply<SmearedMET>(event, "MET").vectorEt();
122 const double ptmiss = vptmiss.perp();
123 MSG_DEBUG("HT = " << ht/GeV << " GeV, HTmiss = " << htmiss/GeV << " GeV");
124
125
126 /////////////////////////////////////
127 // Event selection
128
129 // Njet cut
130 if (_flow->fillnext(njets < 2)) vetoEvent;
131 // HT cut
132 if (_flow->fillnext(ht < 300*GeV)) vetoEvent;
133 // HTmiss cut
134 if (_flow->fillnext(htmiss < 300*GeV)) vetoEvent;
135
136 // Isolated leptons cut
137 if (!select(isoleps, Cuts::pT > 10*GeV).empty()) vetoEvent;
138 // Isolated tracks cut
139 for (const Particle& t : isochgs) {
140 const double mT = sqrt(2*t.pT()*ptmiss * (1 - cos(deltaPhi(t, vptmiss))) );
141 if (mT < 100*GeV) continue;
142 const double pTmax = (t.abspid() == PID::ELECTRON || t.abspid() == PID::MUON) ? 5*GeV : 10*GeV;
143 if (t.pT() > pTmax) vetoEvent;
144 }
145 //
146 // // Inefficiently separated version of isolation cuts for detailed cutflow debugging
147 // // Muon cut
148 // if (!select(isoleps, Cuts::pT > 10*GeV && Cuts::abspid == PID::MUON).empty()) vetoEvent;
149 // _flow.fill(4);
150 // // Muon isotrk cut
151 // for (const Particle& t : select(isochgs, Cuts::abspid == PID::MUON)) {
152 // const double mT = sqrt(2*t.pT()*ptmiss * (1 - cos(deltaPhi(t, vptmiss))) );
153 // if (mT > 100*GeV && t.pT() > 5*GeV) vetoEvent;
154 // }
155 // _flow.fill(5);
156 // // Electron cut
157 // if (!select(isoleps, Cuts::pT > 10*GeV && Cuts::abspid == PID::ELECTRON).empty()) vetoEvent;
158 // _flow.fill(6);
159 // // Electron isotrk cut
160 // for (const Particle& t : select(isochgs, Cuts::abspid == PID::ELECTRON)) {
161 // const double mT = sqrt(2*t.pT()*ptmiss * (1 - cos(deltaPhi(t, vptmiss))) );
162 // if (mT > 100*GeV && t.pT() > 5*GeV) vetoEvent;
163 // }
164 // _flow.fill(7);
165 // // Hadron isotrk cut
166 // for (const Particle& t : select(isochgs, Cuts::abspid != PID::ELECTRON && Cuts::abspid != PID::MUON)) {
167 // const double mT = sqrt(2*t.pT()*ptmiss * (1 - cos(deltaPhi(t, vptmiss))) );
168 // if (mT > 100*GeV && t.pT() > 10*GeV) vetoEvent;
169 // }
170 _flow->fillnext();
171
172
173 // dPhi(jet,HTmiss) cuts
174 if (_flow->fillnext(deltaPhi(vhtmiss, isojets[0]) < 0.5)) vetoEvent;
175 if (_flow->fillnext(deltaPhi(vhtmiss, isojets[1]) < 0.5)) vetoEvent;
176 if (_flow->fillnext(njets >= 3 && deltaPhi(vhtmiss, isojets[2]) < 0.3)) vetoEvent;
177 if (_flow->fillnext(njets >= 4 && deltaPhi(vhtmiss, isojets[3]) < 0.3)) vetoEvent;
178
179
180 /////////////////////////////////////
181 // Find SR index and fill counter
182
183 const double w = 1.0;
184
185 const int idx_j = binIndex(njets, vector<int>{2,3,5,7,9}, true);
186 const int idx_b = binIndex(nbjets, vector<int>{0,1,2,3}, true);
187 int idx_k = -1;
188 if (inRange(htmiss/GeV, 300, 350)) {
189 idx_k = ht < 500*GeV ? 1 : ht < 1000*GeV ? 2 : 3;
190 } else if (inRange(htmiss/GeV, 350, 500) && ht > 350*GeV) {
191 idx_k = ht < 500*GeV ? 4 : ht < 1000*GeV ? 5 : 6;
192 } else if (inRange(htmiss/GeV, 500, 750) && ht > 500*GeV) {
193 idx_k = ht < 1000*GeV ? 7 : 8;
194 } else if (htmiss/GeV > 750 && ht > 750*GeV) {
195 idx_k = ht < 1500*GeV ? 9 : 10;
196 }
197
198 // Fill via 3-tuple index
199 if (idx_j >= 0 && idx_b >= 0 && idx_k >= 0) {
200 const auto idx = std::make_tuple(idx_j+1,idx_b+1,idx_k);
201 if (has_key(_counts, idx)) _counts[idx]->fill(w);
202 }
203
204
205 /////////////////////////////////////
206 // Aggregate SRs
207
208 // Region Njet Nb-jet HT [GeV] HTmiss [GeV] Parton multiplicity Heavy flavor ? ∆m
209 if (njets >= 2 && nbjets == 0 && ht >= 500*GeV && htmiss >= 500*GeV) _counts_agg[0]->fill(w);
210 if (njets >= 3 && nbjets == 0 && ht >= 1500*GeV && htmiss >= 750*GeV) _counts_agg[1]->fill(w);
211 if (njets >= 5 && nbjets == 0 && ht >= 500*GeV && htmiss >= 500*GeV) _counts_agg[2]->fill(w);
212 if (njets >= 5 && nbjets == 0 && ht >= 1500*GeV && htmiss >= 750*GeV) _counts_agg[3]->fill(w);
213 if (njets >= 9 && nbjets == 0 && ht >= 1500*GeV && htmiss >= 750*GeV) _counts_agg[4]->fill(w);
214 if (njets >= 2 && nbjets >= 2 && ht >= 500*GeV && htmiss >= 500*GeV) _counts_agg[5]->fill(w);
215 if (njets >= 3 && nbjets >= 1 && ht >= 750*GeV && htmiss >= 750*GeV) _counts_agg[6]->fill(w);
216 if (njets >= 5 && nbjets >= 3 && ht >= 500*GeV && htmiss >= 500*GeV) _counts_agg[7]->fill(w);
217 if (njets >= 5 && nbjets >= 2 && ht >= 1500*GeV && htmiss >= 750*GeV) _counts_agg[8]->fill(w);
218 if (njets >= 9 && nbjets >= 3 && ht >= 750*GeV && htmiss >= 750*GeV) _counts_agg[9]->fill(w);
219 if (njets >= 7 && nbjets >= 1 && ht >= 300*GeV && htmiss >= 300*GeV) _counts_agg[10]->fill(w);
220 if (njets >= 5 && nbjets >= 1 && ht >= 750*GeV && htmiss >= 750*GeV) _counts_agg[11]->fill(w);
221
222 }
223
224
225 /// Normalise histograms etc., after the run
226 void finalize() {
227
228 const double norm = 35.9*crossSection()/femtobarn;
229 const double sf = norm/sumOfWeights();
230
231 for (auto& idx_cptr : _counts)
232 scale(idx_cptr.second, sf);
233 for (CounterPtr& cptr : _counts_agg)
234 scale(cptr, sf);
235
236 scale(_flow, sf);
237 MSG_INFO("CUTFLOWS:\n\n" << _flow);
238
239 }
240
241 /// @}
242
243
244 private:
245
246 CutflowPtr _flow;
247
248 map<tuple<int,int,int>, CounterPtr> _counts;
249 CounterPtr _counts_agg[12];
250
251 };
252
253
254 RIVET_DECLARE_PLUGIN(CMS_2017_I1594909);
255
256
257}
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