Rivet analyses referenceBABAR_2015_I1308513$J/\psi\phi$ mass spectrum in $B^{+,0}\to J/\psi \phi K^{+,0}$Experiment: BABAR (PEP-II) Inspire ID: 1308513 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
$J/\psi\phi$ mass spectrum in $B^{+,0}\to J/\psi \phi K^{+,0}$. Only the final background subtracted, efficiency corrected distribution averaged over $B^+$ and $B^0$ is implemented. Source code: BABAR_2015_I1308513.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 -> J/psi phi K
10 class BABAR_2015_I1308513 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2015_I1308513);
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||
24 Cuts::abspid==521);
25 declare(ufs, "UFS");
26 DecayedParticles BB(ufs);
27 BB.addStable(310);
28 BB.addStable(333);
29 BB.addStable(443);
30 declare(BB, "BB");
31 // histo
32 book(_h,1,1,1);
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 static const map<PdgId,unsigned int> & mode1 = { { 443,1},{ 333,1}, { 321,1}};
39 static const map<PdgId,unsigned int> & mode1CC = { { 443,1},{ 333,1}, {-321,1}};
40 static const map<PdgId,unsigned int> & mode2 = { { 443,1},{ 333,1}, { 130,1}};
41 static const map<PdgId,unsigned int> & mode2CC = { { 443,1},{ 333,1}, { 310,1}};
42 DecayedParticles BB = apply<DecayedParticles>(event, "BB");
43 // loop over particles
44 for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
45 if (BB.modeMatches(ix,3,mode1) ||
46 BB.modeMatches(ix,3,mode1CC) ||
47 BB.modeMatches(ix,3,mode2) ||
48 BB.modeMatches(ix,3,mode2CC)) {
49 const Particle & phi = BB.decayProducts()[ix].at(333)[0];
50 const Particle & psi = BB.decayProducts()[ix].at(443)[0];
51 _h->fill((phi.momentum()+psi.momentum()).mass());
52 }
53 }
54 }
55
56
57 /// Normalise histograms etc., after the run
58 void finalize() {
59 normalize(_h,1.,false);
60 }
61
62 /// @}
63
64
65 /// @name Histograms
66 /// @{
67 Histo1DPtr _h;
68 /// @}
69
70
71 };
72
73
74 RIVET_DECLARE_PLUGIN(BABAR_2015_I1308513);
75
76}
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