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138 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief D_10 and D_20 spectra
class CLEOII_1994_I372349 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1994_I372349);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// book histos
book(_h_D2_cTheta,2,1,1);
book(_h_D2_x ,1,1,1);
book(_h_D1_cTheta,2,1,2);
book(_h_D1_x ,1,1,2);
for(unsigned int ix=0;ix<3;++ix)
book(_r[ix],3,1,ix+1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const int idD1 = 10423;
static const int idD2 = 425;
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double Emax = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0;
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::abspid==idD1 or Cuts::abspid==idD2)) {
if(p.abspid()==idD1) {
// spectrum
double Pmax = sqrt(sqr(Emax)-sqr(2.421));
double xp = p.momentum().p3().mod()/Pmax;
_h_D1_x->fill(xp);
}
else {
double Pmax = sqrt(sqr(Emax)-sqr(2.461));
double xp = p.momentum().p3().mod()/Pmax;
_h_D2_x->fill(xp);
}
int sign = p.pid()/p.abspid();
Particle Dstar;
if(p.children().size()!=2) continue;
if(p.children()[0].pid()==sign*413 &&
p.children()[1].pid()==-sign*211) {
Dstar = p.children()[0];
}
else if(p.children()[1].pid()==sign*413 &&
p.children()[0].pid()==-sign*211) {
Dstar = p.children()[1];
}
else if(p.children()[0].pid()==sign*411 &&
p.children()[1].pid()==-sign*211) {
if(p.abspid()!=idD1) _r[0]->fill(0.5);
continue;
}
else if(p.children()[1].pid()==sign*411 &&
p.children()[0].pid()==-sign*211) {
if(p.abspid()!=idD1) _r[0]->fill(0.5);
continue;
}
else {
continue;
}
if(p.abspid()==idD1)
_r[2]->fill(0.5);
else
_r[1]->fill(0.5);
if(Dstar.children().size()!=2) continue;
Particle pion;
if(Dstar.children()[0].pid()== sign*211 &&
Dstar.children()[1].pid()== sign*421) {
pion = Dstar.children()[0];
}
else if(Dstar.children()[1].pid()== sign*211 &&
Dstar.children()[0].pid()== sign*421) {
pion = Dstar.children()[1];
}
else
continue;
// first boost to the D_1,2 rest frame
LorentzTransform boost1 = LorentzTransform::mkFrameTransformFromBeta(p.momentum().betaVec());
FourMomentum pDstar = boost1.transform(Dstar.momentum());
FourMomentum pPion = boost1.transform(pion .momentum());
// to D* rest frame
LorentzTransform boost2 = LorentzTransform::mkFrameTransformFromBeta(pDstar.betaVec());
Vector3 axis = pDstar.p3().unit();
FourMomentum pp = boost2.transform(pPion);
// calculate angle
double cTheta = pp.p3().unit().dot(axis);
if(p.abspid()==idD1)
_h_D1_cTheta->fill(cTheta);
else
_h_D2_cTheta->fill(cTheta);
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_D2_cTheta);
normalize(_h_D2_x );
normalize(_h_D1_cTheta);
normalize(_h_D1_x );
for(unsigned int ix=0;ix<3;++ix)
scale(_r[ix],crossSection()/sumOfWeights()/picobarn);
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h_D2_cTheta,_h_D2_x,_h_D1_cTheta,_h_D1_x;
Histo1DPtr _r[3];
///@}
};
RIVET_DECLARE_PLUGIN(CLEOII_1994_I372349);
}
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