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
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief EEC at 34.6 GeV
class PLUTO_1985_I215869 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(PLUTO_1985_I215869);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
// Book histograms
book(_h_EEC, 1, 1, 1);
book(_weightSum, "TMP/weightSum");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const FinalState& fs = apply<FinalState>(event, "FS");
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if ( fs.particles().size() < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
_weightSum->fill();
double Evis = 0.0;
for (const Particle& p : fs.particles()) {
Evis += p.E();
}
double Evis2 = sqr(Evis);
// (A)EEC
// Need iterators since second loop starts at current outer loop iterator, i.e. no "foreach" here!
for (Particles::const_iterator p_i = fs.particles().begin(); p_i != fs.particles().end(); ++p_i) {
for (Particles::const_iterator p_j = p_i; p_j != fs.particles().end(); ++p_j) {
const Vector3 mom3_i = p_i->momentum().p3();
const Vector3 mom3_j = p_j->momentum().p3();
const double energy_i = p_i->momentum().E();
const double energy_j = p_j->momentum().E();
const double cosij = mom3_i.unit().dot(mom3_j.unit());
//const double thetaij = mom3_i.unit().angle(mom3_j.unit())/M_PI*180.;
double eec = (energy_i*energy_j) / Evis2;
if(p_i != p_j) eec *= 2.;
_h_EEC ->fill(cosij, eec);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_EEC , 1./ *_weightSum);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_EEC;
CounterPtr _weightSum;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(PLUTO_1985_I215869);
}
|