Rivet analyses referenceBABAR_2012_I1127599Mass distributions in $B^-\to\Sigma_c^{++}\bar{p}\pi^-\pi^-$Experiment: BABAR (PEP-II) Inspire ID: 1127599 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurements of mass distributions in $B^-\to\Sigma_c^{++}\bar{p}\pi^-\pi^-$. The data were read from the plots in the paper but are background subtracted and efficiency corrected. Source code: BABAR_2012_I1127599.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- -> Sigma_c++ pbar pi- pi-
10 class BABAR_2012_I1127599 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I1127599);
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==521);
24 declare(ufs, "UFS");
25 DecayedParticles BP(ufs);
26 BP.addStable( 4222);
27 BP.addStable(-4222);
28 declare(BP, "BP");
29 // histos
30 for(unsigned int ix=0;ix<3;++ix)
31 book(_h[ix],1+ix,1,1);
32 }
33
34
35 /// Perform the per-event analysis
36 void analyze(const Event& event) {
37 static const map<PdgId,unsigned int> & mode = { { 4222,1},{-2212,1}, {-211,2}};
38 static const map<PdgId,unsigned int> & modeCC = { {-4222,1},{ 2212,1}, { 211,2}};
39 DecayedParticles BP = apply<DecayedParticles>(event, "BP");
40 // loop over particles
41 for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
42 int sign = 1;
43 if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,4,mode)) {
44 sign=1;
45 }
46 else if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,4,modeCC)) {
47 sign=-1;
48 }
49 else
50 continue;
51 const Particle & SigC = BP.decayProducts()[ix].at( sign*4222)[0];
52 const Particle & pbar = BP.decayProducts()[ix].at(-sign*2212)[0];
53 const Particles & pim = BP.decayProducts()[ix].at(-sign*211 );
54 for(unsigned int ix=0;ix<2;++ix) {
55 _h[0]->fill((pbar.momentum()+pim[ix].momentum()).mass());
56 _h[1]->fill((SigC.momentum()+pim[ix].momentum()).mass());
57 }
58 _h[2]->fill((SigC.momentum()+pim[0].momentum()+pim[1].momentum()).mass());
59 }
60 }
61
62
63 /// Normalise histograms etc., after the run
64 void finalize() {
65 for(unsigned int ix=0;ix<3;++ix)
66 normalize(_h[ix],1.,false);
67 }
68
69 /// @}
70
71
72 /// @name Histograms
73 /// @{
74 Histo1DPtr _h[3];
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(BABAR_2012_I1127599);
82
83}
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