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 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief eta_c -> K+K- eta or pi0
class BABAR_2014_I1287632 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2014_I1287632);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::pid== 441);
declare(ufs, "UFS");
DecayedParticles ETAC(ufs);
ETAC.addStable(PID::PI0);
ETAC.addStable(PID::ETA);
declare(ETAC,"ETAC");
// histos
book(_h_KK[0],1,1,1);
book(_h_KK[1],2,1,1);
book(_h_Kpeta,1,1,2);
book(_h_Kmeta,1,1,3);
book(_h_Kppi ,2,1,2);
book(_h_Kmpi ,2,1,3);
book(_dalitz[0], "dalitz_1",50,0.5,7.0,50,0.5 ,7.0);
book(_dalitz[1], "dalitz_2",50,0.2,6.5,50,0.2,6.5);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,1},{-321,1}, {111,1}};
static const map<PdgId,unsigned int> & mode2 = { { 321,1},{-321,1}, {221,1}};
DecayedParticles ETAC = apply<DecayedParticles>(event, "ETAC");
// loop over particles
for(unsigned int ix=0;ix<ETAC.decaying().size();++ix) {
int imode=0;
if (ETAC.modeMatches(ix,3,mode1)) imode=0;
else if(ETAC.modeMatches(ix,3,mode2)) imode=1;
else continue;
const Particle & Kp = ETAC.decayProducts()[ix].at( 321)[0];
const Particle & Km = ETAC.decayProducts()[ix].at(-321)[0];
if(imode==0 && ETAC.decaying()[ix].mass()>2.922 && ETAC.decaying()[ix].mass()<3.036) {
const Particle & pi0 = ETAC.decayProducts()[ix].at( 111)[0];
double mplus = (Kp.momentum()+pi0.momentum()).mass2();
double mminus = (Km.momentum()+pi0.momentum()).mass2();
double mKK = (Kp.momentum()+Km .momentum()).mass2();
_h_KK[1]->fill(mKK);
_h_Kppi->fill(mplus);
_h_Kmpi->fill(mminus);
_dalitz[1]->fill(mplus,mminus);
}
else if (imode==1 && ETAC.decaying()[ix].mass()>2.910 && ETAC.decaying()[ix].mass()<3.03) {
const Particle & eta = ETAC.decayProducts()[ix].at( 221)[0];
double mplus = (Kp.momentum()+eta.momentum()).mass2();
double mminus = (Km.momentum()+eta.momentum()).mass2();
double mKK = (Kp.momentum()+Km .momentum()).mass2();
_h_KK[0]->fill(mKK);
_h_Kpeta->fill(mplus);
_h_Kmeta->fill(mminus);
_dalitz[0]->fill(mplus,mminus);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_KK[0]);
normalize(_h_KK[1]);
normalize(_h_Kmpi);
normalize(_h_Kppi);
normalize(_h_Kmeta);
normalize(_h_Kpeta);
normalize(_dalitz[0]);
normalize(_dalitz[1]);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h_KK[2],_h_Kmeta,_h_Kpeta,_h_Kmpi,_h_Kppi;
Histo2DPtr _dalitz[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BABAR_2014_I1287632);
}
|