Rivet analyses referenceBELLE_2022_I2512112Hadronic mass distributions in $B\to D^{(*)}\pi(\pi)\ell\nu$ decaysExperiment: BELLE (KEKB) Inspire ID: 2512112 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass of the hadronic system in $B\to D^{(*)}\pi(\pi)\ell\nu$ decays Source code: BELLE_2022_I2512112.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 B -> D pi (pi) semileptonic
10 class BELLE_2022_I2512112 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2022_I2512112);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // Initialise and register projections
23 UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 or
24 Cuts::abspid==521);
25 declare(ufs, "UFS");
26 DecayedParticles BB(ufs);
27 BB.addStable(411); BB.addStable(-411);
28 BB.addStable(421); BB.addStable(-421);
29 BB.addStable(413); BB.addStable(-413);
30 BB.addStable(423); BB.addStable(-423);
31 BB.addStable(PID::PI0);
32 declare(BB, "BB");
33 // histograms
34 for(unsigned int ix=0;ix<3;++ix)
35 for(unsigned int iy=0;iy<2;++iy)
36 book(_h[ix][iy],1+ix,1,1+iy);
37 }
38
39
40 /// Perform the per-event analysis
41 void analyze(const Event& event) {
42 static const map<PdgId,unsigned int> mode1[4] = {{ {-421,1}, {-211,1}, {-11,1}, { 12,1}},
43 { { 421,1}, { 211,1}, { 11,1}, {-12,1}},
44 { {-421,1}, {-211,1}, {-13,1}, { 14,1}},
45 { { 421,1}, { 211,1}, { 13,1}, {-14,1}}};
46 static const map<PdgId,unsigned int> mode2[4] = {{ {-411,1}, { 211,1}, {-11,1}, { 12,1}},
47 { { 411,1}, {-211,1}, { 11,1}, {-12,1}},
48 { {-411,1}, { 211,1}, {-13,1}, { 14,1}},
49 { { 411,1}, {-211,1}, { 13,1}, {-14,1}}};
50 static const map<PdgId,unsigned int> mode3[4] = {{ {-423,1}, {-211,1}, {-11,1}, { 12,1}},
51 { { 423,1}, { 211,1}, { 11,1}, {-12,1}},
52 { {-423,1}, {-211,1}, {-13,1}, { 14,1}},
53 { { 423,1}, { 211,1}, { 13,1}, {-14,1}}};
54 static const map<PdgId,unsigned int> mode4[4] = {{ {-413,1}, { 211,1}, {-11,1}, { 12,1}},
55 { { 413,1}, {-211,1}, { 11,1}, {-12,1}},
56 { {-413,1}, { 211,1}, {-13,1}, { 14,1}},
57 { { 413,1}, {-211,1}, { 13,1}, {-14,1}}};
58 static const map<PdgId,unsigned int> mode5[4] = {{ {-411,1}, {-211,1}, { 211,1}, {-11,1}, { 12,1}},
59 { { 411,1}, {-211,1}, { 211,1}, { 11,1}, {-12,1}},
60 { {-411,1}, {-211,1}, { 211,1}, {-13,1}, { 14,1}},
61 { { 411,1}, {-211,1}, { 211,1}, { 13,1}, {-14,1}}};
62 static const map<PdgId,unsigned int> mode6[4] = {{ {-421,1}, {-211,1}, { 211,1}, {-11,1}, { 12,1}},
63 { { 421,1}, {-211,1}, { 211,1}, { 11,1}, {-12,1}},
64 { {-421,1}, {-211,1}, { 211,1}, {-13,1}, { 14,1}},
65 { { 421,1}, {-211,1}, { 211,1}, { 13,1}, {-14,1}}};
66 // loop over B mesons
67 DecayedParticles BB = apply<DecayedParticles>(event, "BB");
68 // loop over particles
69 for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
70 for(unsigned int il=0;il<4;++il) {
71 int iD,iloc1,iloc2;
72 if ( BB.modeMatches(ix,4,mode1[il]) ) {
73 iloc1=0;
74 iloc2=0;
75 iD=-421;
76 }
77 else if ( BB.modeMatches(ix,4,mode2[il]) ) {
78 iloc1=0;
79 iloc2=1;
80 iD=-411;
81 }
82 else if ( BB.modeMatches(ix,4,mode3[il]) ) {
83 iloc1=1;
84 iloc2=0;
85 iD=-423;
86 }
87 else if ( BB.modeMatches(ix,4,mode4[il]) ) {
88 iloc1=1;
89 iloc2=1;
90 iD=-413;
91 }
92 else if ( BB.modeMatches(ix,5,mode5[il]) ) {
93 iloc1=2;
94 iloc2=0;
95 iD=-411;
96 }
97 else if ( BB.modeMatches(ix,5,mode6[il]) ) {
98 iloc1=2;
99 iloc2=1;
100 iD=-421;
101 }
102 else continue;
103 int sign = il%2==0 ? 1 : -1;
104 int ipi = -sign*211;
105 if(iloc2==1) ipi *=-1;
106 const Particle & pi1= BB.decayProducts()[ix].at( ipi)[0];
107 const Particle & DD = BB.decayProducts()[ix].at( iD*sign )[0];
108 FourMomentum pHad = pi1.momentum()+DD.momentum();
109 if(iloc1==2) {
110 const Particle & pi2= BB.decayProducts()[ix].at(-ipi)[0];
111 pHad += pi2.momentum();
112 }
113 double mass = pHad.mass();
114 if(iloc1==1) mass -=DD.mass();
115 _h[iloc1][iloc2]->fill(mass);
116 }
117 }
118 }
119
120
121 /// Normalise histograms etc., after the run
122 void finalize() {
123 for(unsigned int ix=0;ix<3;++ix)
124 for(unsigned int iy=0;iy<2;++iy)
125 normalize(_h[ix][iy],1.,false);
126 }
127
128 /// @}
129
130
131 /// @name Histograms
132 /// @{
133 Histo1DPtr _h[3][2];
134 /// @}
135
136
137 };
138
139
140 RIVET_DECLARE_PLUGIN(BELLE_2022_I2512112);
141
142}
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