1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/PromptFinalState.hh"
#include "Rivet/Projections/DressedLeptons.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
namespace Rivet {
/// @brief WZ production cross-section at 13 TeV
class ATLAS_2019_I1720438 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2019_I1720438);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
PromptFinalState photons(Cuts::abspid == PID::PHOTON);
// Electrons and muons in Fiducial PS
PromptFinalState leptons(Cuts::abspid == PID::ELECTRON || Cuts::abspid == PID::MUON);
leptons.acceptTauDecays(false);
DressedLeptons dressedleptons(photons, leptons, 0.1, Cuts::open(), true);
declare(dressedleptons, "DressedLeptons");
// Prompt neutrinos (yikes!)
IdentifiedFinalState nu_id;
nu_id.acceptNeutrinos();
PromptFinalState neutrinos(nu_id);
neutrinos.acceptTauDecays(false);
declare(neutrinos, "Neutrinos");
MSG_WARNING("\033[91;1mLIMITED VALIDITY - check info file for details!\033[m");
// Muons
PromptFinalState bare_mu(Cuts::abspid == PID::MUON, true); // true = use muons from prompt tau decays
DressedLeptons all_dressed_mu(photons, bare_mu, 0.1, Cuts::abseta < 2.5, true);
// Electrons
PromptFinalState bare_el(Cuts::abspid == PID::ELECTRON, true); // true = use electrons from prompt tau decays
DressedLeptons all_dressed_el(photons, bare_el, 0.1, Cuts::abseta < 2.5, true);
//Jet forming
VetoedFinalState vfs(FinalState(Cuts::abseta < 5.0));
vfs.addVetoOnThisFinalState(all_dressed_el);
vfs.addVetoOnThisFinalState(all_dressed_mu);
FastJets jets(vfs, FastJets::ANTIKT, 0.4, JetAlg::Muons::ALL, JetAlg::Invisibles::DECAY);
declare(jets, "Jets");
// Book auxiliary histograms
book(_h["pTZ"], "_pTZ", refData( 8, 1, 1));
book(_h["pTW"], "_pTW", refData(10, 1, 1));
book(_h["mTWZ"], "_mTWZ", refData(12, 1, 1));
book(_h["dPhiWZ"], "_dPhiWZ", refData(14, 1, 1));
book(_h["pTv"], "_pTV", refData(16, 1, 1));
book(_h["dRapWZ"], "_drapWZ", refData(18, 1, 1));
book(_h["Njets"], "_njets", refData(20, 1, 1));
book(_h["Mjj"], "_mjj", refData(22, 1, 1));
// book output bar charts
book(_s["pTZ"], 8, 1, 1);
book(_s["pTW"], 10, 1, 1);
book(_s["mTWZ"], 12, 1, 1);
book(_s["dPhiWZ"], 14, 1, 1);
book(_s["pTv"], 16, 1, 1);
book(_s["dRapWZ"], 18, 1, 1);
book(_s["Njets"], 20, 1, 1);
book(_s["Mjj"], 22, 1, 1);
}
void analyze(const Event& event) {
const Particles& dressedleptons = apply<DressedLeptons>(event, "DressedLeptons").particlesByPt();
const Particles& neutrinos = apply<PromptFinalState>(event, "Neutrinos").particlesByPt();
Jets jets = apply<FastJets>(event, "Jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 4.5);
int i, j, k;
double MassZ01 = 0., MassZ02 = 0., MassZ12 = 0.;
double MassW0 = 0., MassW1 = 0., MassW2 = 0.;
double WeightZ1, WeightZ2, WeightZ3;
double WeightW1, WeightW2, WeightW3;
double M1, M2, M3;
double WeightTotal1, WeightTotal2, WeightTotal3;
//---Fiducial PS: assign leptons to W and Z bosons using Resonant shape algorithm
if (dressedleptons.size() < 3 || neutrinos.size() < 1) vetoEvent;
//--- count num of electrons and muons
int Nel = 0, Nmu = 0;
for (const Particle& l : dressedleptons) {
if (l.abspid() == 11) ++Nel;
if (l.abspid() == 13) ++Nmu;
}
int icomb=0;
// try Z pair of leptons 01
if ( (dressedleptons[0].pid() ==-(dressedleptons[1].pid())) && (dressedleptons[2].pid()*neutrinos[0].pid()< 0) && (dressedleptons[2].abspid()==neutrinos[0].abspid()-1)) {
MassZ01 = (dressedleptons[0].momentum() + dressedleptons[1].momentum()).mass();
MassW2 = (dressedleptons[2].momentum() + neutrinos[0].momentum()).mass();
icomb = 1;
}
// try Z pair of leptons 02
if ( (dressedleptons[0].pid()==-(dressedleptons[2].pid())) && (dressedleptons[1].pid()*neutrinos[0].pid()< 0) && (dressedleptons[1].abspid()==neutrinos[0].abspid()-1)) {
MassZ02 = (dressedleptons[0].momentum() + dressedleptons[2].momentum()).mass();
MassW1 = (dressedleptons[1].momentum() + neutrinos[0].momentum()).mass();
icomb = 2;
}
// try Z pair of leptons 12
if ( (dressedleptons[1].pid()==-(dressedleptons[2].pid())) && (dressedleptons[0].pid()*neutrinos[0].pid()< 0) && (dressedleptons[0].abspid()==neutrinos[0].abspid()-1)) {
MassZ12 = (dressedleptons[1].momentum() + dressedleptons[2].momentum()).mass();
MassW0 = (dressedleptons[0].momentum() + neutrinos[0].momentum()).mass();
icomb = 3;
}
if (icomb<=0) vetoEvent;
WeightZ1 = 1/(pow(MassZ01*MassZ01 - MZ_PDG*MZ_PDG,2) + pow(MZ_PDG*GammaZ_PDG,2));
WeightW1 = 1/(pow(MassW2*MassW2 - MW_PDG*MW_PDG,2) + pow(MW_PDG*GammaW_PDG,2));
WeightTotal1 = WeightZ1*WeightW1;
M1 = -1*WeightTotal1;
WeightZ2 = 1/(pow(MassZ02*MassZ02- MZ_PDG*MZ_PDG,2) + pow(MZ_PDG*GammaZ_PDG,2));
WeightW2 = 1/(pow(MassW1*MassW1- MW_PDG*MW_PDG,2) + pow(MW_PDG*GammaW_PDG,2));
WeightTotal2 = WeightZ2*WeightW2;
M2 = -1*WeightTotal2;
WeightZ3 = 1/(pow(MassZ12*MassZ12 - MZ_PDG*MZ_PDG,2) + pow(MZ_PDG*GammaZ_PDG,2));
WeightW3 = 1/(pow(MassW0*MassW0 - MW_PDG*MW_PDG,2) + pow(MW_PDG*GammaW_PDG,2));
WeightTotal3 = WeightZ3*WeightW3;
M3 = -1*WeightTotal3;
if( (M1 < M2 && M1 < M3) || (MassZ01 != 0 && MassW2 != 0 && MassZ02 == 0 && MassZ12 == 0) ) {
i = 0; j = 1; k = 2;
}
if((M2 < M1 && M2 < M3) || (MassZ02 != 0 && MassW1 != 0 && MassZ01 == 0 && MassZ12 == 0) ) {
i = 0; j = 2; k = 1;
}
if((M3 < M1 && M3 < M2) || (MassZ12 != 0 && MassW0 != 0 && MassZ01 == 0 && MassZ02 == 0) ) {
i = 1; j = 2; k = 0;
}
FourMomentum Zlepton1 = dressedleptons[i].mom();
FourMomentum Zlepton2 = dressedleptons[j].mom();
FourMomentum Wlepton = dressedleptons[k].mom();
FourMomentum Zboson = dressedleptons[i].mom()+dressedleptons[j].mom();
FourMomentum Wboson = dressedleptons[k].mom()+neutrinos[0].mom();
double cosLepNeut;
double Wboson_mT = 0;
double norm = Wlepton.pT() * neutrinos[0].pt();
if (norm != 0) {
cosLepNeut = ( Wlepton.px()*neutrinos[0].px() + Wlepton.py()*neutrinos[0].py() )/norm;
if ( 1-cosLepNeut >= 0 ) Wboson_mT = sqrt( 2 * Wlepton.pT() * neutrinos[0].pt() * (1-cosLepNeut ) );
}
//---- CUTS (based on Table 1 WZ: 36.1 fb-1)----//
if (Wlepton.pT() <= 20*GeV || Zlepton1.pT() <= 15*GeV || Zlepton2.pT() <= 15*GeV) vetoEvent;
if (Wlepton.abseta() >= 2.5 || Zlepton1.abseta() >= 2.5 || Zlepton2.abseta() >= 2.5) vetoEvent;
if (fabs(Zboson.mass()/GeV - MZ_PDG) >= 10.) vetoEvent;
if (Wboson_mT <= 30*GeV) vetoEvent;
if (deltaR(Zlepton1, Zlepton2) <= 0.2) vetoEvent;
if (deltaR(Zlepton1, Wlepton) <= 0.3) vetoEvent;
if (deltaR(Zlepton2, Wlepton) <= 0.3) vetoEvent;
double pTZ = Zboson.pT()/GeV;
double WZ_pt = (Zlepton1.pt() + Zlepton2.pt() + Wlepton.pt() + neutrinos[0].pt())/GeV;
double WZ_px = (Zlepton1.px() + Zlepton2.px() + Wlepton.px() + neutrinos[0].px())/GeV;
double WZ_py = (Zlepton1.py() + Zlepton2.py() + Wlepton.py() + neutrinos[0].py())/GeV;
double mTWZ = sqrt( pow(WZ_pt, 2) - ( pow(WZ_px, 2) + pow(WZ_py,2) ));
double dPhiWZTruth = acos(cos(Zboson.phi()-Wboson.phi()));
double pTW = Wboson.pT()/GeV;
double pTv = neutrinos[0].pT()/GeV;
double AbsDeltay = fabs(Zboson.rapidity()-Wlepton.rapidity());
ifilter_discard(jets, [&](const Jet& j) {
return deltaR(j, Zlepton1) < 0.3 || deltaR(j, Zlepton2) < 0.3 || deltaR(j, Wlepton) < 0.3;
});
size_t njets = jets.size()>5? 5 : jets.size();
_h["Njets"]->fill(njets);
if (njets > 1) {
double mjj = (jets[0].mom() + jets[1].mom()).mass()/GeV;
if (mjj > 800.) mjj = 800.;
_h["Mjj"]->fill(mjj);
}
if (pTZ > 220.) pTZ = 220.;
_h["pTZ"]->fill(pTZ);
if (pTW > 220.) pTW = 220.;
_h["pTW"]->fill(pTW);
if (mTWZ > 600.) mTWZ = 600.;
_h["mTWZ"]->fill(mTWZ);
_h["dPhiWZ"]->fill(dPhiWZTruth);
if (pTv > 90.) pTv = 90.;
_h["pTv"]->fill(pTv);
_h["dRapWZ"]->fill(AbsDeltay);
}
void finalize() {
scale(_h, 0.25 * crossSectionPerEvent() / femtobarn); // data values are for _single_ lepton channel
// unfortunately, no differential cross-sections were measured in this analysis
for (auto &item : _h) barchart(item.second, _s[item.first]);
}
//@}
private:
/// @name Histograms
//@{
map<string, Histo1DPtr> _h;
map<string, Scatter2DPtr> _s;
//@}
double MZ_PDG = 91.1876;
double MW_PDG = 80.385;
double GammaZ_PDG = 2.4952;
double GammaW_PDG = 2.085;
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_2019_I1720438);
}
|