Rivet analyses referenceCLEO_2007_I732065$\chi_{c1}\to \eta\pi^+\pi^-$, $K^+K^-\pi^0$ and $\pi^+K^-K^0_S$Experiment: CLEO (CESR) Inspire ID: 732065 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decays $\chi_{c1}\to \eta\pi^+\pi^-$, $K^+K^-\pi^0$ and $\pi^+K^-K^0_S$. The data were read from the plots in the paper and may not be corrected for efficiency or background. Source code: CLEO_2007_I732065.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/UnstableParticles.hh"
4#include "Rivet/Projections/DecayedParticles.hh"
5
6namespace Rivet {
7
8
9 /// @brief chi_c1 -> eta pi+pi- and KKpi
10 class CLEO_2007_I732065 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2007_I732065);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 UnstableParticles ufs = UnstableParticles(Cuts::pid==20443);
23 declare(ufs, "UFS");
24 DecayedParticles chi(ufs);
25 chi.addStable( PID::PI0);
26 chi.addStable( PID::K0S);
27 chi.addStable( PID::ETA);
28 declare(chi, "chi");
29 for(unsigned int ix=0;ix<3;++ix)
30 for(unsigned int iy=0;iy<3;++iy)
31 book(_h[ix][iy],ix+1,1,iy+1);
32 book(_dalitz[0],"dalitz_1",50,0.,12.,50,0., 9.);
33 book(_dalitz[1],"dalitz_2",50,0.,10.,50,0.,10.);
34 book(_dalitz[2],"dalitz_3",50,0.,10.,50,0.,10.);
35 }
36
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 static const map<PdgId,unsigned int> & mode1 = { { 221,1}, { 211,1}, {-211,1} };
41 static const map<PdgId,unsigned int> & mode2 = { { 321,1}, {-321,1}, { 111,1} };
42 static const map<PdgId,unsigned int> & mode3 = { {-321,1}, { 310,1}, { 211,1} };
43 static const map<PdgId,unsigned int> & mode4 = { { 321,1}, { 310,1}, {-211,1} };
44 DecayedParticles chi = apply<DecayedParticles>(event, "chi");
45 // loop over particles
46 for(unsigned int ix=0;ix<chi.decaying().size();++ix) {
47 if(chi.modeMatches(ix,3,mode1)) {
48 const Particle & eta = chi.decayProducts()[ix].at( 221)[0];
49 const Particle & pim = chi.decayProducts()[ix].at(-211)[0];
50 const Particle & pip = chi.decayProducts()[ix].at( 211)[0];
51 double m1 = (pip.momentum()+pim.momentum()).mass2();
52 double m2 = (eta.momentum()+pip.momentum()).mass2();
53 double m3 = (eta.momentum()+pim.momentum()).mass2();
54 _dalitz[0]->fill(m2,m1);
55 _h[0][0]->fill(m1);
56 _h[0][1]->fill(m2);
57 _h[0][2]->fill(m3);
58 }
59 else if(chi.modeMatches(ix,3,mode2)) {
60 const Particle & pi0 = chi.decayProducts()[ix].at( 111)[0];
61 const Particle & Km = chi.decayProducts()[ix].at(-321)[0];
62 const Particle & Kp = chi.decayProducts()[ix].at( 321)[0];
63 double m1 = (pi0.momentum()+ Km.momentum()).mass2();
64 double m2 = (pi0.momentum()+ Kp.momentum()).mass2();
65 double m3 = (Kp .momentum()+ Km.momentum()).mass2();
66 _dalitz[1]->fill(m2,m1);
67 _h[1][0]->fill(m1);
68 _h[1][1]->fill(m2);
69 _h[1][2]->fill(m3);
70 }
71 else {
72 int sign=1;
73 if(chi.modeMatches(ix,3,mode3)) {
74 sign = 1;
75 }
76 else if(chi.modeMatches(ix,3,mode4)) {
77 sign = -1;
78 }
79 else continue;
80 const Particle & KS0 = chi.decayProducts()[ix].at( 310)[0];
81 const Particle & Km = chi.decayProducts()[ix].at(-sign*321)[0];
82 const Particle & pip = chi.decayProducts()[ix].at( sign*211)[0];
83 double m1 = (pip.momentum()+ Km.momentum()).mass2();
84 double m2 = (pip.momentum()+KS0.momentum()).mass2();
85 double m3 = (Km .momentum()+KS0.momentum()).mass2();
86 _dalitz[2]->fill(m2,m1);
87 _h[2][0]->fill(m1);
88 _h[2][1]->fill(m2);
89 _h[2][2]->fill(m3);
90 }
91 }
92 }
93
94
95 /// Normalise histograms etc., after the run
96 void finalize() {
97 for(unsigned int ix=0;ix<3;++ix) {
98 normalize(_dalitz[ix]);
99 for(unsigned int iy=0;iy<3;++iy)
100 normalize(_h[ix][iy]);
101 }
102 }
103
104 /// @}
105
106
107 /// @name Histograms
108 /// @{
109 Histo1DPtr _h[3][3];
110 Histo2DPtr _dalitz[3];
111 /// @}
112
113
114 };
115
116
117 RIVET_DECLARE_PLUGIN(CLEO_2007_I732065);
118
119}
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