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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief phi spectrum in continuum, and Upsilon 1s and 2s decays
class ARGUS_1989_I262551 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1989_I262551);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_cont, 1, 1, 1);
book(_h_ups1, 2, 1, 1);
book(_h_ups2, 2, 1, 2);
book(_n_Phi[0], "/TMP/NUps1");
book(_n_Phi[1], "/TMP/NUps2");
book(_weightSum_cont, "TMP/weightSum_cont");
book(_weightSum_Ups1, "TMP/weightSum_Ups1");
book(_weightSum_Ups2, "TMP/weightSum_Ups2");
}
/// Recursively walk the decay tree to find decay products of @a p
void findDecayProducts(Particle mother, Particles& phis) {
for(const Particle & p: mother.children()) {
const int id = p.pid();
if(id == 333) {
phis.push_back(p);
}
if(!p.children().empty())
findDecayProducts(p, phis);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Find the Upsilons among the unstables
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
Particles upsilons = ufs.particles(Cuts::pid==553 or Cuts::pid==100553);
// Continuum
if (upsilons.empty()) {
MSG_DEBUG("No Upsilons found => continuum event");
_weightSum_cont->fill();
for (const Particle& p : ufs.particles(Cuts::pid==333)) {
const double xp = 2.*p.E()/sqrtS();
const double beta = p.p3().mod() / p.E();
_h_cont->fill(xp,1./beta);
}
}
// Upsilon(s) found
else {
MSG_DEBUG("Upsilons found => resonance event");
for (const Particle& ups : upsilons) {
const int parentId = ups.pid();
if(parentId==553) {
_weightSum_Ups1->fill();
}
else {
_weightSum_Ups2->fill();
}
Particles phis;
// Find the decay products we want
findDecayProducts(ups, phis);
LorentzTransform cms_boost;
if (ups.p3().mod() > 1*MeV)
cms_boost = LorentzTransform::mkFrameTransformFromBeta(ups.momentum().betaVec());
const double mass = ups.mass();
// loop over decay products
for(const Particle& p : phis) {
const FourMomentum p2 = cms_boost.transform(p.momentum());
const double xp = 2.*p2.E()/mass;
const double beta = p2.p3().mod()/p2.E();
if(parentId==553) {
_n_Phi[0]->fill();
_h_ups1->fill(xp,1./beta);
}
else {
_n_Phi[1]->fill();
_h_ups2->fill(xp,1./beta);
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
if (_weightSum_cont->effNumEntries() > 0.)
scale(_h_cont, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights());
if (_weightSum_Ups1->effNumEntries() > 0.) {
scale(_h_ups1, 1./ *_weightSum_Ups1);
}
if (_weightSum_Ups2->effNumEntries() > 0.) {
scale(_h_ups2, 1./ *_weightSum_Ups2);
}
// Counters
vector<CounterPtr> scales = {_weightSum_Ups1,_weightSum_Ups2};
for(unsigned int ix=0;ix<2;++ix) {
Scatter2DPtr scatter;
book(scatter, 3+ix, 1, 1, true);
scale(_n_Phi[ix], 1./ *scales[ix]);
scatter->point(0).setY(_n_Phi[ix]->val(),
_n_Phi[ix]->err());
}
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_cont, _h_ups1, _h_ups2;
CounterPtr _n_Phi[2];
CounterPtr _weightSum_cont,_weightSum_Ups1,_weightSum_Ups2;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ARGUS_1989_I262551);
}
|