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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief pi0 and eta at Upsilon 1,2 and continuum
class ARGUS_1990_I278933 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1990_I278933);
/// @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_pi1 ,3, 1, 1);
book(_h_cont_pi2 ,3, 1, 2);
book(_h_ups1_pi ,4, 1, 1);
book(_h_ups2_pi ,4, 1, 2);
book(_h_cont_eta1,5, 1, 1);
book(_h_cont_eta2,5, 1, 2);
book(_h_ups1_eta ,6, 1, 1);
book(_h_ups2_eta ,6, 1, 2);
book(_n_Eta[0], "/TMP/EtaCont");
book(_n_Eta[1], "/TMP/EtaUps1");
book(_n_Eta[2], "/TMP/EtaUps2");
book(_n_Pi[0] , "/TMP/PiCont");
book(_n_Pi[1] , "/TMP/PiUps1");
book(_n_Pi[2] , "/TMP/PiUps2");
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& unstable) {
for(const Particle & p: mother.children()) {
const int id = p.pid();
if(id == 111 or id == 221) {
unstable.push_back(p);
}
if(!p.children().empty())
findDecayProducts(p, unstable);
}
}
/// 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==111 or Cuts::pid==221)) {
const int id = p.pid();
const double xp = 2.*p.E()/sqrtS();
const double beta = p.p3().mod() / p.E();
if(id==111) {
_n_Pi[0]->fill();
_h_cont_pi1->fill(xp,1./beta);
_h_cont_pi2->fill(xp,1./beta);
}
else {
_n_Eta[0]->fill();
_h_cont_eta1->fill(xp,1./beta);
_h_cont_eta2->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 unstable;
// Find the decay products we want
findDecayProducts(ups, unstable);
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 : unstable) {
const int id = p.pid();
const FourMomentum p2 = cms_boost.transform(p.momentum());
const double xp = 2.*p2.E()/mass;
const double beta = p2.p3().mod()/p2.E();
if(id==111) {
if(parentId==553) {
_n_Pi[1]->fill();
_h_ups1_pi->fill(xp,1./beta);
}
else {
_n_Pi[2]->fill();
_h_ups2_pi->fill(xp,1./beta);
}
}
else if(id==221) {
if(parentId==553) {
_n_Eta[1]->fill();
_h_ups1_eta->fill(xp,1./beta);
}
else {
_n_Eta[2]->fill();
_h_ups2_eta->fill(xp,1./beta);
}
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// Scale histos
if (_weightSum_cont->val() > 0.) {
scale(_h_cont_pi1, 1./ *_weightSum_cont);
scale(_h_cont_pi2, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights());
scale(_h_cont_eta1, 1./ *_weightSum_cont);
scale(_h_cont_eta2, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights());
}
if (_weightSum_Ups1->val() > 0.) {
scale(_h_ups1_pi, 1./ *_weightSum_Ups1);
scale(_h_ups1_eta, 1./ *_weightSum_Ups1);
}
if (_weightSum_Ups2->val() > 0.) {
scale(_h_ups2_pi, 1./ *_weightSum_Ups2);
scale(_h_ups2_eta, 1./ *_weightSum_Ups2);
}
// Counters
vector<CounterPtr> scales = {_weightSum_cont,_weightSum_Ups1,_weightSum_Ups2};
for(unsigned int ix=0;ix<3;++ix) {
Scatter2DPtr scatter;
book(scatter, 1, 1, ix+1, true);
scale(_n_Pi[ix],1./ *scales[ix]);
scatter->point(0).setY(_n_Pi[ix]->val(),
_n_Pi[ix]->err());
}
for(unsigned int ix=0;ix<3;++ix) {
Scatter2DPtr scatter;
book(scatter, 2, 1, ix+1, true);
scale(_n_Eta[ix],1./ *scales[ix]);
scatter->point(0).setY(_n_Eta[ix]->val(),
_n_Eta[ix]->err());
}
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_cont_pi1 , _h_cont_pi2 , _h_ups1_pi , _h_ups2_pi ;
Histo1DPtr _h_cont_eta1, _h_cont_eta2, _h_ups1_eta, _h_ups2_eta;
CounterPtr _n_Eta[3],_n_Pi[3];
CounterPtr _weightSum_cont,_weightSum_Ups1,_weightSum_Ups2;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ARGUS_1990_I278933);
}
|