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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
namespace { // unnamed namespace
// Forward declarations of calculator functions: implementations at bottom of file
double getWidth(const Jet& jet);
/// @todo Re-enable eccentricity calculation
// double getEcc(const Jet& jet);
double getPFlow(const Jet& jet);
double getAngularity(const Jet& jet);
}
class ATLAS_2012_I1119557 : public Analysis {
public:
ATLAS_2012_I1119557()
: Analysis("ATLAS_2012_I1119557")
{ }
void init() {
const FinalState fs;
declare(fs, "FinalState");
FastJets fj06(fs, FastJets::ANTIKT, 0.6);
declare(fj06, "AntiKT06");
FastJets fj10(fs, FastJets::ANTIKT, 1.0);
declare(fj10, "AntiKT10");
for (size_t alg = 0; alg < 2; ++alg) {
book(_hs_mass[alg] ,1, alg+1, 1);
book(_hs_width[alg] ,2, alg+1, 1);
/// @todo Commented eccentricity out for now: reinstate
//book( _hs_eccentricity[alg] ,3, alg+1, 1);
}
book(_h_planarFlow ,4, 2, 1);
book(_h_angularity ,5, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
Jets jetAr[2];
jetAr[0] = apply<FastJets>(event, "AntiKT06").jetsByPt(Cuts::pT > 300*GeV && Cuts::abseta < 2.0);
jetAr[1] = apply<FastJets>(event, "AntiKT10").jetsByPt(Cuts::pT > 300*GeV && Cuts::abseta < 2.0);
for (size_t alg = 0; alg < 2; ++alg) {
// Require at least one jet
if (jetAr[alg].size() < 1) continue;
// The leading jet
const Jet& jet = jetAr[alg][0];
const double m = jet.mass();
const double eta = jet.eta();
_hs_mass[alg]->fill(m/GeV);
_hs_width[alg]->fill(getWidth(jet));
/// @todo Commented eccentricity out for now: reinstate
// if (fabs(eta) < 0.7 && m > 100*GeV) _hs_eccentricity[alg]->fill(getEcc(jet));
if (fabs(eta) < 0.7) {
if (alg == 0 && inRange(m/GeV, 100., 130.)) _h_angularity->fill(getAngularity(jet));
if (alg == 1 && inRange(m/GeV, 130., 210.)) _h_planarFlow->fill(getPFlow(jet));
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for (size_t alg = 0; alg < 2; ++alg) {
normalize(_hs_mass[alg]);
normalize(_hs_width[alg]);
/// @todo Commented eccentricity out for now: reinstate
// normalize(_hs_eccentricity[alg]);
}
normalize(_h_planarFlow);
normalize(_h_angularity);
}
private:
Histo1DPtr _hs_mass[2];
Histo1DPtr _hs_width[2];
/// @todo Commented eccentricity out for now: reinstate
// Histo1DPtr _hs_eccentricity[2];
Histo1DPtr _h_planarFlow;
Histo1DPtr _h_angularity;
};
RIVET_DECLARE_PLUGIN(ATLAS_2012_I1119557);
namespace { // unnamed namespace
// Adapted code from Lily
/// @todo Convert to use the Rivet rotation matrix code (should be simpler)
FourMomentum RotateAxes(const Rivet::FourMomentum& p, double M[3][3]){
double px_rot = M[0][0]*(p.px()) + M[0][1]*(p.py()) + M[0][2]*(p.pz());
double py_rot = M[1][0]*(p.px()) + M[1][1]*(p.py()) + M[1][2]*(p.pz());
double pz_rot = M[2][0]*(p.px()) + M[2][1]*(p.py()) + M[2][2]*(p.pz());
return FourMomentum(p.E(), px_rot, py_rot, pz_rot);
}
// Untouched code from Lily
/// @todo Convert to use the Rivet rotation matrix code (should be simpler)
void CalcRotationMatrix(double nvec[3],double rot_mat[3][3]){
// clear momentum tensor
for (size_t i = 0; i < 3; i++) {
for (size_t j = 0; j < 3; j++) {
rot_mat[i][j] = 0.;
}
}
double mag3 = sqrt(nvec[0]*nvec[0] + nvec[1]*nvec[1]+ nvec[2]*nvec[2]);
double mag2 = sqrt(nvec[0]*nvec[0] + nvec[1]*nvec[1]);
/// @todo cout is not a valid response to a numerical error! Is the error condition reported?!? Assert added by AB for Rivet 1.8.2
assert(mag3 > 0);
if (mag3 <= 0) {
cout << "rotation axis is null" << '\n';
return;
}
double ctheta0 = nvec[2]/mag3;
double stheta0 = mag2/mag3;
double cphi0 = (mag2 > 0.) ? nvec[0]/mag2 : 0;
double sphi0 = (mag2 > 0.) ? nvec[1]/mag2 : 0;
rot_mat[0][0] = -ctheta0*cphi0;
rot_mat[0][1] = -ctheta0*sphi0;
rot_mat[0][2] = stheta0;
rot_mat[1][0] = sphi0;
rot_mat[1][1] = -1.*cphi0;
rot_mat[1][2] = 0.;
rot_mat[2][0] = stheta0*cphi0;
rot_mat[2][1] = stheta0*sphi0;
rot_mat[2][2] = ctheta0;
}
/// Jet width calculation
double getWidth(const Jet& jet) {
const double phi_jet = jet.phi();
const double eta_jet = jet.eta();
double width(0), pTsum(0);
for (const Particle& p : jet.particles()) {
double pT = p.pT();
double eta = p.eta();
double phi = p.phi();
width += sqrt(pow(phi_jet - phi,2) + pow(eta_jet - eta, 2)) * pT;
pTsum += pT;
}
const double rtn = (pTsum != 0.0) ? width/pTsum : -1;
return rtn;
}
/// Eccentricity calculation, copied and adapted from Lily's code
/// @todo Re-enable eccentricity calculation
// double getEcc(const Jet& jet) {
// vector<double> phis;
// vector<double> etas;
// vector<double> energies;
// double etaSum(0), phiSum(0), eTot(0);
// for (const Particle& p : jet.particles()) {
// const double E = p.E();
// const double eta = p.eta();
// energies.push_back(E);
// etas.push_back(jet.eta() - eta);
// eTot += E;
// etaSum += eta * E;
// /// @todo Replace with the Rivet deltaPhi function (or the mapAngleTo* functions)
// double dPhi = jet.phi() - p.phi();
// //if DPhi does not lie within 0 < DPhi < PI take 2*PI off DPhi
// //this covers cases where DPhi is greater than PI
// if( fabs( dPhi - TWOPI ) < fabs(dPhi) ) dPhi -= TWOPI;
// //if DPhi does not lie within -PI < DPhi < 0 add 2*PI to DPhi
// //this covers cases where DPhi is less than -PI
// else if( fabs(dPhi + TWOPI) < fabs(dPhi) ) dPhi += TWOPI;
// phis.push_back(dPhi);
// phiSum += dPhi * E;
// }
// //these are the "pull" away from the jet axis
// etaSum = etaSum/eTot;
// phiSum = phiSum/eTot;
// // now for every cluster we alter its position by moving it:
// // away from the new axis if it is in the direction of -ve pull
// // closer to the new axis if it is in the direction of +ve pull
// // the effect of this will be that the new energy weighted center will be on the old jet axis.
// double little_x(0), little_y(0);
// for (size_t k = 0; k < jet.particles().size(); ++k) {
// little_x+= etas[k]-etaSum;
// little_y+= phis[k]-phiSum;
// etas[k] = etas[k]-etaSum;
// phis[k] = phis[k]-phiSum;
// }
// double x1(0), x2(0);
// for (size_t i = 0; i < jet.particles().size(); ++i) {
// x1 += 2. * energies[i]* etas[i] * phis[i]; // this is 2*X*Y
// x2 += energies[i]*(phis[i] * phis[i] - etas[i] * etas[i] ); // this is X^2 - Y^2
// }
// // Variance calculations
// double theta = .5*atan2(x1, x2);
// double sinTheta =sin(theta);
// double cosTheta = cos(theta);
// double theta2 = theta + 0.5*PI;
// double sinThetaPrime = sin(theta2);
// double cosThetaPrime = cos(theta2);
// double varX(0), varY(0);
// for (size_t i = 0; i < jet.particles().size(); i++) {
// const double x = sinTheta*etas[i] + cosTheta*phis[i];
// const double y = sinThetaPrime*etas[i] + cosThetaPrime*phis[i];
// varX += energies[i]* sqr(x);
// varY += energies[i]* sqr(y);
// }
// const double varianceMax = max(varX, varY);
// const double varianceMin = min(varX, varY);
// const double ecc = (varianceMax != 0.0) ? 1 - varianceMin/varianceMax : -1;
// return ecc;
// }
/// Planar flow calculation, copied and adapted from Lily's code
double getPFlow(const Jet& jet) {
const double phi0 = jet.phi();
const double eta0 = jet.eta();
double nref[3]; ///< @todo 3-vector to rotate x to? Use Rivet vector classes
nref[0] = cos(phi0)/cosh(eta0);
nref[1] = sin(phi0)/cosh(eta0);
nref[2] = tanh(eta0);
// Rotation matrix to align with nref
double rotationMatrix[3][3];
CalcRotationMatrix(nref, rotationMatrix);
double iw00(0.), iw01(0.), iw11(0.), iw10(0.);
for (const Particle& p : jet.particles()) {
double a = 1./(p.E()*jet.mass());
FourMomentum rotclus = RotateAxes(p.momentum(), rotationMatrix);
iw00 += a*pow(rotclus.px(), 2);
iw01 += a*rotclus.px()*rotclus.py();
iw10 += a*rotclus.py()*rotclus.px();
iw11 += a*pow(rotclus.py(), 2);
}
const double det = iw00*iw11 - iw01*iw10;
const double trace = iw00 + iw11;
const double pf = (trace != 0.0) ? (4.0*det)/sqr(trace) : -1;
return pf;
}
/// Angularity calculation, copied and adapted from Lily's code
double getAngularity(const Jet& jet) {
double sum_a = 0.;
// a can take any value < 2 (e.g. 1,0,-0.5 etc) for infrared safety
const double a = -2.;
for (const Particle& p : jet.particles()) {
double e_i = p.E();
double theta_i = jet.momentum().angle(p.momentum());
double e_theta_i = e_i * pow(sin(theta_i), a) * pow(1-cos(theta_i), 1-a);
sum_a += e_theta_i;
}
const double rtn = (jet.mass() != 0.0 && !std::isnan(sum_a)) ? sum_a/jet.mass() : -1;
return rtn;
}
}
}
|