Rivet analyses referenceLHCB_2022_I1960979Mass distributions in $B_c^+\to J/\psi+$ $\pi^+\pi^+\pi^-$, $K^+K^-\pi^+$ and $K^+\pi^+\pi^-$Experiment: LHCB (LHC) Inspire ID: 1960979 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Mass distributions in $B_c^+\to J/\psi+$ $\pi^+\pi^+\pi^-$, $K^+K^-\pi^+$ and $K^+\pi^+\pi^-$. The data were read from the plots in the paper and may not be corrected for efficiency and acceptance. Source code: LHCB_2022_I1960979.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_c - > jpsi + 3 charged hadrons
10 class LHCB_2022_I1960979 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2022_I1960979);
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::abspid==541);
23 declare(ufs, "UFS");
24 DecayedParticles BC(ufs);
25 BC.addStable( PID::PI0);
26 BC.addStable( PID::K0S);
27 BC.addStable( PID::JPSI);
28 declare(BC, "BC");
29 for(unsigned int ix=0;ix<4;++ix) {
30 for(unsigned int iy=0;iy<2;++iy) {
31 if(iy==1&&ix>1) continue;
32 book(_h[ix][iy],1+ix,1,1+iy);
33 }
34 }
35 }
36
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 static const map<PdgId,unsigned int> & mode1 = { { 443,1}, { 211,2}, {-211,1} };
41 static const map<PdgId,unsigned int> & mode1CC = { { 443,1}, {-211,2}, { 211,1} };
42 static const map<PdgId,unsigned int> & mode2 = { { 443,1}, { 321,1}, {-321,1}, { 211,1} };
43 static const map<PdgId,unsigned int> & mode2CC = { { 443,1}, { 321,1}, {-321,1}, {-211,1} };
44 static const map<PdgId,unsigned int> & mode3 = { { 443,1}, { 211,1}, {-211,1}, { 321,1} };
45 static const map<PdgId,unsigned int> & mode3CC = { { 443,1}, { 211,1}, {-211,1}, {-321,1} };
46 static const map<PdgId,unsigned int> & mode4 = { { 443,1}, { 321,2}, {-321,1} };
47 static const map<PdgId,unsigned int> & mode4CC = { { 443,1}, { 321,1}, {-321,2} };
48 DecayedParticles BC = apply<DecayedParticles>(event, "BC");
49 // loop over particles
50 for(unsigned int ix=0;ix<BC.decaying().size();++ix) {
51 int sign = BC.decaying()[ix].pid()/BC.decaying()[ix].abspid();
52 if ((sign== 1 && BC.modeMatches(ix,4,mode1 )) ||
53 (sign==-1 && BC.modeMatches(ix,4,mode1CC))) {
54 const Particle & pim = BC.decayProducts()[ix].at(-sign*211)[0];
55 const Particles & pip = BC.decayProducts()[ix].at( sign*211);
56 _h[0][0]->fill((pim.momentum()+pip[0].momentum()+pip[1].momentum()).mass());
57 _h[0][1]->fill((pim.momentum()+pip[0].momentum()).mass());
58 _h[0][1]->fill((pim.momentum()+pip[1].momentum()).mass());
59 }
60 else if((sign== 1 && BC.modeMatches(ix,4,mode2 )) ||
61 (sign==-1 && BC.modeMatches(ix,4,mode2CC))) {
62 const Particle & Kp = BC.decayProducts()[ix].at( sign*321)[0];
63 const Particle & Km = BC.decayProducts()[ix].at(-sign*321)[0];
64 const Particle & pip = BC.decayProducts()[ix].at( sign*211)[0];
65 _h[1][0]->fill((Km.momentum()+pip.momentum()).mass());
66 _h[1][1]->fill((Km.momentum()+Kp .momentum()).mass());
67 }
68 else if((sign== 1 && BC.modeMatches(ix,4,mode3 )) ||
69 (sign==-1 && BC.modeMatches(ix,4,mode3CC))) {
70 const Particle & pim = BC.decayProducts()[ix].at(-sign*211)[0];
71 const Particle & Kp = BC.decayProducts()[ix].at( sign*321)[0];
72 _h[2][0]->fill((Kp.momentum()+pim.momentum()).mass());
73 }
74 else if((sign== 1 && BC.modeMatches(ix,4,mode4 )) ||
75 (sign==-1 && BC.modeMatches(ix,4,mode4CC))) {
76 const Particle & Km = BC.decayProducts()[ix].at(-sign*321)[0];
77 const Particles & Kp = BC.decayProducts()[ix].at( sign*321);
78 _h[3][0]->fill((Kp[0].momentum()+Km.momentum()).mass());
79 _h[3][0]->fill((Kp[1].momentum()+Km.momentum()).mass());
80 }
81 }
82 }
83
84
85 /// Normalise histograms etc., after the run
86 void finalize() {
87 for(unsigned int ix=0;ix<3;++ix) {
88 for(unsigned int iy=0;iy<2;++iy) {
89 if(iy==1&&ix>1) continue;
90 normalize(_h[ix][iy],1.,false);
91 }
92 }
93 }
94
95 /// @}
96
97
98 /// @name Histograms
99 /// @{
100 Histo1DPtr _h[4][2];
101 /// @}
102
103
104 };
105
106
107 RIVET_DECLARE_PLUGIN(LHCB_2022_I1960979);
108
109}
|
