Rivet analyses referenceBABAR_2017_I1336340Mass distributions in $B^\pm\to K^0_S \pi^\pm\pi^0$Experiment: BABAR (PEP-II) Inspire ID: 1336340 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Mass distributions in $B^\pm\to K^0_S \pi^\pm\pi^0$. The data were read from the plot in the paper and the backgrounds given subtracted, however the backgrounds are large. Source code: BABAR_2017_I1336340.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+ -> KS0 pi+ pi0
10 class BABAR_2017_I1336340 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2017_I1336340);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // projections
23 UnstableParticles ufs = UnstableParticles(Cuts::abspid==521);
24 declare(ufs, "UFS");
25 DecayedParticles BP(ufs);
26 BP.addStable(310);
27 BP.addStable(111);
28 declare(BP, "BP");
29 // histograms
30 for(unsigned int ix=0;ix<3;++ix) {
31 book(_h_sum[ix],1,1,1+ix);
32 for(unsigned int iy=0;iy<2;++iy)
33 book(_h_charge[iy][ix],2,1+iy,1+ix);
34 }
35 }
36
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 static const map<PdgId,unsigned int> & mode = { { 211,1}, { 111,1}, { 310,1}};
41 static const map<PdgId,unsigned int> & modeCC = { {-211,1}, { 111,1}, { 310,1}};
42 DecayedParticles BP = apply<DecayedParticles>(event, "BP");
43 for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
44 int sign = 1;
45 if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,3,mode)) sign= 1;
46 else if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,3,modeCC)) sign=-1;
47 else continue;
48 const Particle & pip = BP.decayProducts()[ix].at( sign*211)[0];
49 const Particle & pi0 = BP.decayProducts()[ix].at( 111)[0];
50 const Particle & K0 = BP.decayProducts()[ix].at( 310)[0];
51 double mKpip = (K0 .momentum()+pip.momentum()).mass();
52 double mKpi0 = (K0 .momentum()+pi0.momentum()).mass();
53 // veto D decaysa
54 if(mKpi0>1.804 && mKpi0<1.924) continue;
55 double mpipi = (pi0.momentum()+pip.momentum()).mass();
56 _h_sum[0]->fill(mKpip);
57 _h_sum[1]->fill(mKpi0);
58 _h_sum[2]->fill(mpipi);
59 _h_charge[(1-sign)/2][0]->fill(mKpip);
60 _h_charge[(1-sign)/2][1]->fill(mKpi0);
61 _h_charge[(1-sign)/2][2]->fill(mpipi);
62 }
63 }
64
65
66 /// Normalise histograms etc., after the run
67 void finalize() {
68 for(unsigned int ix=0;ix<3;++ix) {
69 normalize(_h_sum[ix],1.,false);
70 for(unsigned int iy=0;iy<2;++iy)
71 normalize(_h_charge[iy][ix],1.,false);
72 }
73 }
74
75 /// @}
76
77
78 /// @name Histograms
79 /// @{
80 Histo1DPtr _h_sum[3],_h_charge[2][3];
81 /// @}
82
83
84 };
85
86
87 RIVET_DECLARE_PLUGIN(BABAR_2017_I1336340);
88
89}
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