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
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief pi, eta, eta', K0, lambda spectra
class ALEPH_2000_I507531 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ALEPH_2000_I507531);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
declare(FinalState() , "FS");
// Histograms
// incl
book(_h_pi0 , 1,1,1);
book(_h_eta , 2,1,1);
book(_h_etaP, 3,1,1);
book(_h_K0 , 16,1,1);
book(_h_lam , 17,1,1);
// two jet
book(_h_2_pi0 , 4,1,1);
book(_h_2_eta , 5,1,1);
book(_h_2_etaP, 6,1,1);
book(_h_2_K0 , 18,1,1);
book(_h_2_lam , 19,1,1);
// three jet
book(_h_3_pi0 [0], 7,1,1);
book(_h_3_pi0 [1], 8,1,1);
book(_h_3_pi0 [2], 9,1,1);
book(_h_3_eta [0], 10,1,1);
book(_h_3_eta [1], 11,1,1);
book(_h_3_eta [2], 12,1,1);
book(_h_3_etaP[0], 13,1,1);
book(_h_3_etaP[1], 14,1,1);
book(_h_3_etaP[2], 15,1,1);
book(_h_3_K0 [0], 20,1,1);
book(_h_3_K0 [1], 21,1,1);
book(_h_3_K0 [2], 22,1,1);
book(_h_3_lam [0], 23,1,1);
book(_h_3_lam [1], 24,1,1);
book(_h_3_lam [2], 25,1,1);
book(_w2,"/TMP/W2");
book(_w3,"/TMP/W3");
}
void findDecayProducts(const Particle & parent, Particles & decay) {
for(const Particle & child : parent.children()) {
if(child.children().empty()) {
decay.push_back(child);
}
else {
findDecayProducts(child,decay);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
Particles decay,fs;
// unstable particles
const UnstableParticles ufs = apply<UnstableParticles>(event, "UFS");
for(const Particle & part : ufs.particles(Cuts::pid==111 or Cuts::pid==221 or Cuts::pid==331 or
Cuts::pid==310 or Cuts::abspid==3122)) {
fs.push_back(part);
findDecayProducts(part,decay);
}
// FS particles
for(const Particle & part : apply<FinalState>(event, "FS").particles()) {
bool skip=false;
for(const Particle & dec :decay) {
if(dec.genParticle()==part.genParticle()) {
skip=true;
break;
}
}
if(skip) continue;
fs.push_back(part);
}
// Definition of the Durham algorithm
fastjet::JetDefinition durham_def(fastjet::ee_kt_algorithm, fastjet::E_scheme, fastjet::Best);
// pseudojets
vector<fastjet::PseudoJet> input_particles;
// Pseudo-jets from the non photons
unsigned int ix=0;
for (const Particle& p : fs ) {
const FourMomentum p4 = p.momentum();
input_particles.push_back(fastjet::PseudoJet(p4.px(), p4.py(), p4.pz(), p4.E()));
input_particles.back().set_user_index(ix);
++ix;
}
// cluster the jets
fastjet::ClusterSequence clust_seq(input_particles, durham_def);
PseudoJets jets = fastjet::sorted_by_E(clust_seq.exclusive_jets_ycut(0.01));
if(jets.size()==2) _w2->fill();
else if(jets.size()==3) _w3->fill();
ix=0;
for(const Particle & part : fs) {
double xE = part.momentum().E()/meanBeamMom;
double xP = part.momentum().p3().mod()/meanBeamMom;
int ijet = jets.size()!=3 ? -1 : findJet(ix,jets);
if(part.pid()==111) {
_h_pi0->fill(xE);
if(jets.size()==2) {
_h_2_pi0->fill(xE);
}
else if(jets.size()==3) {
_h_3_pi0[ijet]->fill(xE);
}
}
else if(part.pid()==221) {
_h_eta->fill(xE);
if(jets.size()==2) {
_h_2_eta->fill(xE);
}
else if(jets.size()==3) {
_h_3_eta[ijet]->fill(xE);
}
}
else if(part.pid()==331) {
_h_etaP->fill(xE);
if(jets.size()==2) {
_h_2_etaP->fill(xE);
}
else if(jets.size()==3) {
_h_3_etaP[ijet]->fill(xE);
}
}
else if(part.pid()==310) {
double xi=-log(xP);
_h_K0->fill(xi);
if(jets.size()==2) {
_h_2_K0->fill(xi);
}
else if(jets.size()==3) {
_h_3_K0[ijet]->fill(xi);
}
}
else if(part.abspid()==3122) {
double xi=-log(xP);
_h_lam->fill(xi);
if(jets.size()==2) {
_h_2_lam->fill(xi);
}
else if(jets.size()==3) {
_h_3_lam[ijet]->fill(xi);
}
}
else {
break;
}
ix+=1;
}
}
int findJet(int id, const PseudoJets & jets) {
for(unsigned int ijet=0;ijet<jets.size();++ijet) {
for(const PseudoJet & con : jets[ijet].constituents()) {
if(con.user_index()==id)
return ijet;
}
}
return -1;
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_pi0 ,1./sumOfWeights());
scale(_h_eta ,1./sumOfWeights());
scale(_h_etaP ,1./sumOfWeights());
scale(_h_K0 ,1./sumOfWeights());
scale(_h_lam ,1./sumOfWeights());
scale(_h_2_pi0 ,1./ *_w2);
scale(_h_2_eta ,1./ *_w2);
scale(_h_2_etaP ,1./ *_w2);
scale(_h_2_K0 ,1./ *_w2);
scale(_h_2_lam ,1./ *_w2);
for(unsigned int ix=0;ix<3;++ix ) {
scale(_h_3_pi0[ix] ,1./ *_w3);
scale(_h_3_eta[ix] ,1./ *_w3);
scale(_h_3_etaP[ix],1./ *_w3);
scale(_h_3_K0[ix] ,1./ *_w3);
scale(_h_3_lam[ix] ,1./ *_w3);
}
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_pi0 , _h_eta , _h_etaP , _h_K0 , _h_lam ;
Histo1DPtr _h_2_pi0 , _h_2_eta , _h_2_etaP , _h_2_K0 , _h_2_lam ;
Histo1DPtr _h_3_pi0[3], _h_3_eta[3], _h_3_etaP[3], _h_3_K0[3], _h_3_lam[3];
CounterPtr _w2,_w3;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ALEPH_2000_I507531);
}
|