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
| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief k0s in b decays
class ARGUS_1994_I354224 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1994_I354224);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_K, 1, 1, 1);
book(_nB,"TMP/nB");
}
void analyzeDecay(Particle mother, Particles & kaons) {
for(const Particle & p : mother.children()) {
if(p.pid()==310) {
kaons.push_back(p);
}
else if(!p.children().empty()) {
analyzeDecay(p,kaons);
}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==511 or Cuts::abspid==521)) {
if(!p.children().empty()) {
if(p.children()[0].pid()==p.pid()) continue;
}
FourMomentum pB = p.momentum();
const LorentzTransform B_boost = LorentzTransform::mkFrameTransformFromBeta(pB.betaVec());
_nB->fill();
Particles kaons;
analyzeDecay(p,kaons);
for(const Particle & kaon : kaons) {
FourMomentum pKaon = B_boost.transform(kaon.momentum());
_h_K->fill(pKaon.p3().mod());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_K, 1./ *_nB);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_K;
CounterPtr _nB;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ARGUS_1994_I354224);
}
|