// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B+ -> D_s(*) K pi
class BELLE_2009_I816632 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2009_I816632);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BP(ufs);
BP.addStable( 431);
BP.addStable(-431);
BP.addStable( 433);
BP.addStable(-433);
declare(BP, "BP");
// histograms
for(unsigned int ix=0;ix<2;++ix) {
book(_h_mass[ix],1,1,1+ix);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { -431,1}, { 321,1}, { 211,1}};
static const map<PdgId,unsigned int> & mode1CC = { { 431,1}, {-321,1}, {-211,1}};
static const map<PdgId,unsigned int> & mode2 = { { -433,1}, { 321,1}, { 211,1}};
static const map<PdgId,unsigned int> & mode2CC = { { 433,1}, {-321,1}, {-211,1}};
DecayedParticles BP = apply<DecayedParticles>(event, "BP");
// loop over particles
for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
int sign=1, mode=0;
if (BP.modeMatches(ix,3,mode1 )) {
mode = 0;
sign = 1;
}
else if (BP.modeMatches(ix,3,mode1CC)) {
sign =-1;
mode = 0;
}
else if (BP.modeMatches(ix,3,mode2 )) {
mode = 1;
sign = 1;
}
else if (BP.modeMatches(ix,3,mode2CC)) {
sign =-1;
mode = 1;
}
else continue;
const Particle & Ds = BP.decayProducts()[ix].at(-sign*(431+2*mode))[0];
const Particle & Kp = BP.decayProducts()[ix].at( sign*321)[0];
_h_mass[mode]->fill((Ds.momentum()+Kp.momentum()).mass());
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<2;++ix) {
normalize(_h_mass[ix],1.,false);
}
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h_mass[2];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2009_I816632);
}