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
252
253
254
255
256
257
258
259
260
261
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Math/LorentzTrans.hh"
namespace Rivet {
/// D0 topological distributions of 3- and 4-jet events.
class D0_1996_S3214044 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(D0_1996_S3214044);
/// @name Analysis methods
/// @{
/// Book histograms
void init() {
const FinalState fs;
declare(fs, "FS");
/// @todo Use correct jet algorithm --- tried FJ3 D0RunICone but does
// not look as good as the Run2 cone alg used here
declare(FastJets(fs, FastJets::D0ILCONE, 0.7), "ConeJets");
book(_h_3j_x3 ,1, 1, 1);
book(_h_3j_x5 ,2, 1, 1);
book(_h_3j_costheta3 ,3, 1, 1);
book(_h_3j_psi ,4, 1, 1);
book(_h_3j_mu34 ,5, 1, 1);
book(_h_3j_mu35 ,6, 1, 1);
book(_h_3j_mu45 ,7, 1, 1);
book(_h_4j_x3 ,8, 1, 1);
book(_h_4j_x4 ,9, 1, 1);
book(_h_4j_x5 ,10, 1, 1);
book(_h_4j_x6 ,11, 1, 1);
book(_h_4j_costheta3 ,12, 1, 1);
book(_h_4j_costheta4 ,13, 1, 1);
book(_h_4j_costheta5 ,14, 1, 1);
book(_h_4j_costheta6 ,15, 1, 1);
book(_h_4j_cosomega34 ,16, 1, 1);
book(_h_4j_cosomega35 ,17, 1, 1);
book(_h_4j_cosomega36 ,18, 1, 1);
book(_h_4j_cosomega45 ,19, 1, 1);
book(_h_4j_cosomega46 ,20, 1, 1);
book(_h_4j_cosomega56 ,21, 1, 1);
book(_h_4j_mu34 ,22, 1, 1);
book(_h_4j_mu35 ,23, 1, 1);
book(_h_4j_mu36 ,24, 1, 1);
book(_h_4j_mu45 ,25, 1, 1);
book(_h_4j_mu46 ,26, 1, 1);
book(_h_4j_mu56 ,27, 1, 1);
book(_h_4j_theta_BZ ,28, 1, 1);
book(_h_4j_costheta_NR ,29, 1, 1);
}
void analyze(const Event& event) {
Jets jets_in = apply<FastJets>(event, "ConeJets")
.jets(Cuts::Et > 20*GeV && Cuts::abseta < 3, cmpMomByEt);
Jets jets_isolated;
for (size_t i = 0; i < jets_in.size(); ++i) {
bool isolated = true;
for (size_t j = 0; j < jets_in.size(); ++j) {
if (i != j && deltaR(jets_in[i], jets_in[j]) < 1.4) {
isolated = false;
break;
}
}
if (isolated) jets_isolated.push_back(jets_in[i]);
}
if (jets_isolated.size() == 0 || jets_isolated[0].Et() < 60.0*GeV) vetoEvent;
if (jets_isolated.size() > 2) _threeJetAnalysis(jets_isolated);
if (jets_isolated.size() > 3) _fourJetAnalysis(jets_isolated);
}
void finalize() {
normalize(_h_3j_x3, 1.0);
normalize(_h_3j_x5, 1.0);
normalize(_h_3j_costheta3, 1.0);
normalize(_h_3j_psi, 1.0);
normalize(_h_3j_mu34, 1.0);
normalize(_h_3j_mu35, 1.0);
normalize(_h_3j_mu45, 1.0);
normalize(_h_4j_x3, 1.0);
normalize(_h_4j_x4, 1.0);
normalize(_h_4j_x5, 1.0);
normalize(_h_4j_x6, 1.0);
normalize(_h_4j_costheta3, 1.0);
normalize(_h_4j_costheta4, 1.0);
normalize(_h_4j_costheta5, 1.0);
normalize(_h_4j_costheta6, 1.0);
normalize(_h_4j_cosomega34, 1.0);
normalize(_h_4j_cosomega35, 1.0);
normalize(_h_4j_cosomega36, 1.0);
normalize(_h_4j_cosomega45, 1.0);
normalize(_h_4j_cosomega46, 1.0);
normalize(_h_4j_cosomega56, 1.0);
normalize(_h_4j_mu34, 1.0);
normalize(_h_4j_mu35, 1.0);
normalize(_h_4j_mu36, 1.0);
normalize(_h_4j_mu45, 1.0);
normalize(_h_4j_mu46, 1.0);
normalize(_h_4j_mu56, 1.0);
normalize(_h_4j_theta_BZ, 1.0);
normalize(_h_4j_costheta_NR, 1.0);
}
/// @}
private:
/// @name Helper functions
/// @{
void _threeJetAnalysis(const Jets& jets) {
// >=3 jet events
FourMomentum jjj(jets[0].momentum()+jets[1].momentum()+jets[2].momentum());
const double sqrts = _safeMass(jjj);
if (sqrts<200*GeV) {
return;
}
const LorentzTransform cms_boost = LorentzTransform::mkFrameTransformFromBeta(jjj.betaVec());
vector<FourMomentum> jets_boosted;
for (Jet jet : jets) {
jets_boosted.push_back(cms_boost.transform(jet.momentum()));
}
std::sort(jets_boosted.begin(), jets_boosted.end(), FourMomentum::byEDescending());
FourMomentum p3(jets_boosted[0]);
FourMomentum p4(jets_boosted[1]);
FourMomentum p5(jets_boosted[2]);
Vector3 beam1(0.0, 0.0, 1.0);
Vector3 p1xp3 = beam1.cross(p3.p3());
Vector3 p4xp5 = p4.p3().cross(p5.p3());
const double cospsi = p1xp3.dot(p4xp5)/p1xp3.mod()/p4xp5.mod();
_h_3j_x3->fill(2.0*p3.E()/sqrts);
_h_3j_x5->fill(2.0*p5.E()/sqrts);
_h_3j_costheta3->fill(fabs(cos(p3.theta())));
_h_3j_psi->fill(acos(cospsi)/degree);
_h_3j_mu34->fill(_safeMass(FourMomentum(p3+p4))/sqrts);
_h_3j_mu35->fill(_safeMass(FourMomentum(p3+p5))/sqrts);
_h_3j_mu45->fill(_safeMass(FourMomentum(p4+p5))/sqrts);
}
void _fourJetAnalysis(const Jets& jets) {
// >=4 jet events
FourMomentum jjjj(jets[0].momentum() + jets[1].momentum() + jets[2].momentum()+ jets[3].momentum());
const double sqrts = _safeMass(jjjj);
if (sqrts < 200*GeV) return;
const LorentzTransform cms_boost = LorentzTransform::mkFrameTransformFromBeta(jjjj.betaVec());
vector<FourMomentum> jets_boosted;
for (Jet jet : jets) {
jets_boosted.push_back(cms_boost.transform(jet.momentum()));
}
sort(jets_boosted.begin(), jets_boosted.end(), FourMomentum::byEDescending());
FourMomentum p3(jets_boosted[0]);
FourMomentum p4(jets_boosted[1]);
FourMomentum p5(jets_boosted[2]);
FourMomentum p6(jets_boosted[3]);
Vector3 p3xp4 = p3.p3().cross(p4.p3());
Vector3 p5xp6 = p5.p3().cross(p6.p3());
const double costheta_BZ = p3xp4.dot(p5xp6)/p3xp4.mod()/p5xp6.mod();
const double costheta_NR = (p3.p3()-p4.p3()).dot(p5.p3()-p6.p3())/
(p3.p3()-p4.p3()).mod()/(p5.p3()-p6.p3()).mod();
_h_4j_x3->fill(2.0*p3.E()/sqrts);
_h_4j_x4->fill(2.0*p4.E()/sqrts);
_h_4j_x5->fill(2.0*p5.E()/sqrts);
_h_4j_x6->fill(2.0*p6.E()/sqrts);
_h_4j_costheta3->fill(fabs(cos(p3.theta())));
_h_4j_costheta4->fill(fabs(cos(p4.theta())));
_h_4j_costheta5->fill(fabs(cos(p5.theta())));
_h_4j_costheta6->fill(fabs(cos(p6.theta())));
_h_4j_cosomega34->fill(cos(p3.angle(p4)));
_h_4j_cosomega35->fill(cos(p3.angle(p5)));
_h_4j_cosomega36->fill(cos(p3.angle(p6)));
_h_4j_cosomega45->fill(cos(p4.angle(p5)));
_h_4j_cosomega46->fill(cos(p4.angle(p6)));
_h_4j_cosomega56->fill(cos(p5.angle(p6)));
_h_4j_mu34->fill(_safeMass(FourMomentum(p3+p4))/sqrts);
_h_4j_mu35->fill(_safeMass(FourMomentum(p3+p5))/sqrts);
_h_4j_mu36->fill(_safeMass(FourMomentum(p3+p6))/sqrts);
_h_4j_mu45->fill(_safeMass(FourMomentum(p4+p5))/sqrts);
_h_4j_mu46->fill(_safeMass(FourMomentum(p4+p6))/sqrts);
_h_4j_mu56->fill(_safeMass(FourMomentum(p5+p6))/sqrts);
_h_4j_theta_BZ->fill(acos(fabs(costheta_BZ))/degree);
_h_4j_costheta_NR->fill(fabs(costheta_NR));
}
double _safeMass(const FourMomentum& p) {
double mass2=p.mass2();
if (mass2>0.0) return sqrt(mass2);
else if (mass2<-1.0e-5) {
MSG_WARNING("m2 = " << m2 << ". Assuming m2=0.");
return 0.0;
}
else return 0.0;
}
/// @}
private:
/// @name Histograms
/// @{
Histo1DPtr _h_3j_x3;
Histo1DPtr _h_3j_x5;
Histo1DPtr _h_3j_costheta3;
Histo1DPtr _h_3j_psi;
Histo1DPtr _h_3j_mu34;
Histo1DPtr _h_3j_mu35;
Histo1DPtr _h_3j_mu45;
Histo1DPtr _h_4j_x3;
Histo1DPtr _h_4j_x4;
Histo1DPtr _h_4j_x5;
Histo1DPtr _h_4j_x6;
Histo1DPtr _h_4j_costheta3;
Histo1DPtr _h_4j_costheta4;
Histo1DPtr _h_4j_costheta5;
Histo1DPtr _h_4j_costheta6;
Histo1DPtr _h_4j_cosomega34;
Histo1DPtr _h_4j_cosomega35;
Histo1DPtr _h_4j_cosomega36;
Histo1DPtr _h_4j_cosomega45;
Histo1DPtr _h_4j_cosomega46;
Histo1DPtr _h_4j_cosomega56;
Histo1DPtr _h_4j_mu34;
Histo1DPtr _h_4j_mu35;
Histo1DPtr _h_4j_mu36;
Histo1DPtr _h_4j_mu45;
Histo1DPtr _h_4j_mu46;
Histo1DPtr _h_4j_mu56;
Histo1DPtr _h_4j_theta_BZ;
Histo1DPtr _h_4j_costheta_NR;
/// @}
};
RIVET_DECLARE_ALIASED_PLUGIN(D0_1996_S3214044, D0_1996_I399364);
}
|