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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Sigma_c(2800) rate and spectra
class BELLE_2004_I668024 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2004_I668024);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
for(unsigned int ix=0;ix<3;++ix) {
book(_r[ix], 1, 1, 1+ix);
book(_h[ix], 2, 1, 1+ix);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles()) {
const Vector3 mom3 = p.p3();
double pp = mom3.mod();
double xp = pp/sqrt(0.25*sqr(sqrtS())-sqr(p.mass()));
int id = abs(p.pid());
if(id==_sid+110 && isDecay(p,{4122,-211})) {
_h[0]->fill(xp);
_r[0]->fill(0.5);
}
else if(id==_sid+210&& isDecay(p,{4122,111})) {
_h[1]->fill(xp);
_r[1]->fill(0.5);
}
else if(id==_sid+220&& isDecay(p,{4122,211})) {
_h[2]->fill(xp);
_r[2]->fill(0.5);
}
}
}
// Check for explicit decay into pdgids
bool isDecay(const Particle& mother, vector<int> ids) {
if(mother.pid()<0) {
for(unsigned int ix=0;ix<ids.size();++ix)
ids[ix] *= -1;
}
// Trivial check to ignore any other decays but the one in question modulo photons
const Particles children = mother.children(Cuts::pid!=PID::PHOTON);
if (children.size()!=ids.size()) return false;
// Check for the explicit decay
return all(ids, [&](int i){return count(children, hasPID(i))==1;});
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix) {
normalize(_h[ix]);
scale(_r[ix], crossSection()/picobarn/sumOfWeights());
}
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h[3],_r[3];
static const int _sid = 14002;
///@}
};
RIVET_DECLARE_PLUGIN(BELLE_2004_I668024);
}
|