// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief Xi_c+ -> Sigma+ K- pi+ and Xi- pi+ pi+
class FOCUS_2003_I618864 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(FOCUS_2003_I618864);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==4232);
declare(ufs, "UFS");
DecayedParticles XICP(ufs);
XICP.addStable(PID::PI0);
XICP.addStable(PID::K0S);
XICP.addStable(PID::ETA);
XICP.addStable(3222);
XICP.addStable(-3222);
XICP.addStable(3312);
XICP.addStable(-3312);
declare(XICP, "XICP");
// histograms
for(unsigned int ix=0;ix<2;++ix)
book(_h[ix],1+ix,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { PID::KMINUS,1}, { 3222,1}, { PID::PIPLUS ,1}};
static const map<PdgId,unsigned int> & mode1CC = { { PID::KPLUS ,1}, {-3222,1}, { PID::PIMINUS,1}};
static const map<PdgId,unsigned int> & mode2 = { { 3312,1}, { PID::PIPLUS ,2}};
static const map<PdgId,unsigned int> & mode2CC = { {-3312,1}, { PID::PIMINUS,2}};
DecayedParticles XICP = apply<DecayedParticles>(event, "XICP");
// loop over particles
for(unsigned int ix=0;ix<XICP.decaying().size();++ix) {
int sign = XICP.decaying()[ix].pid()/XICP.decaying()[ix].abspid();
if ( (sign== 1 && XICP.modeMatches(ix,3,mode1 )) ||
(sign==-1 && XICP.modeMatches(ix,3,mode1CC)) ) {
const Particle & pip = XICP.decayProducts()[ix].at( sign*PID::PIPLUS)[0];
const Particle & Km = XICP.decayProducts()[ix].at( sign*PID::KMINUS)[0];
for(unsigned int ix=0;ix<2;++ix)
_h[0]->fill((pip.momentum()+Km.momentum()).mass());
}
else if ( (sign== 1 && XICP.modeMatches(ix,3,mode2 )) ||
(sign==-1 && XICP.modeMatches(ix,3,mode2CC)) ) {
const Particles & pip = XICP.decayProducts()[ix].at( sign*PID::PIPLUS);
const Particle & xi = XICP.decayProducts()[ix].at( sign*3312)[0];
_h[1]->fill((pip[0].momentum()+xi.momentum()).mass());
_h[1]->fill((pip[1].momentum()+xi.momentum()).mass());
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<2;++ix)
normalize(_h[ix],1.,false);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[2];
/// @}
};
RIVET_DECLARE_PLUGIN(FOCUS_2003_I618864);
}