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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief hyperon production
class ARGUS_1988_I251097 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1988_I251097);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
for(unsigned int ix=0;ix<2;++ix) {
for(unsigned int iy=0;iy<7;++iy) {
std::ostringstream title;
title << "/TMP/MULT_" << ix << "_" << iy;
book(_mult[ix][iy],title.str());
}
}
book(_hist_ups1_lambda , 3,1,1);
book(_hist_ups2_lambda , 4,1,1);
book(_hist_cont_lambda1, 5,1,1);
book(_hist_cont_lambda2, 6,1,1);
book(_hist_ups1_xi , 7,1,1);
book(_hist_ups2_xi , 8,1,1);
book(_hist_cont_xi , 9,1,1);
book(_weightSum_cont,"TMP/sum_cont");
book(_weightSum_Ups1,"TMP/sum_ups1");
book(_weightSum_Ups2,"TMP/sum_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 = abs(p.pid());
if (id == 3122 || id == 3312 || id == 3212 || id == 3114 ||
id == 3224 || id == 3324 || id == 3334) {
unstable.push_back(p);
}
if(!p.children().empty())
findDecayProducts(p, unstable);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First in unstable final state
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
Particles upsilons = ufs.particles(Cuts::pid==553 || Cuts::pid==100553);
// continuum
if (upsilons.empty()) {
_weightSum_cont->fill();
for (const Particle& p : ufs.particles()) {
int id = p.abspid();
double modp = p.p3().mod();
double xp = 2.*modp/sqrtS();
double xE = 2.*p.E()/sqrtS();
double beta = modp/p.E();
if (id == 3122) {
_hist_cont_lambda1->fill(xp);
_hist_cont_lambda2->fill(xE, 1./beta);
_mult[1][0]->fill();
}
else if (id == 3312) {
_hist_cont_xi->fill(xE, 1./beta);
_mult[1][1]->fill();
}
else if (id == 3212) {
_mult[1][2]->fill();
}
else if (id == 3114) {
_mult[1][3]->fill();
}
else if (id == 3224) {
_mult[1][4]->fill();
}
else if (id == 3324) {
_mult[1][5]->fill();
}
else if (id == 3334) {
_mult[1][6]->fill();
}
}
}
// Upslion decays
else {
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() > 0.001)
cms_boost = LorentzTransform::mkFrameTransformFromBeta(ups.momentum().betaVec());
double mass = ups.mass();
for(const Particle & p : unstable) {
int id = p.abspid();
FourMomentum p2 = cms_boost.transform(p.momentum());
double modp = p2.p3().mod();
double xp = 2.*modp/mass;
if (id == 3122) {
if(parentId==553) {
_hist_ups1_lambda->fill(xp);
_mult[0][0]->fill();
}
else {
_hist_ups2_lambda->fill(xp);
}
}
else if (id == 3312) {
if(parentId==553) {
_hist_ups1_xi->fill(xp);
_mult[0][1]->fill();
}
else {
_hist_ups2_xi->fill(xp);
}
}
else if(parentId==553) {
if (id == 3212) {
_mult[0][2]->fill();
}
else if (id == 3114) {
_mult[0][3]->fill();
}
else if (id == 3224) {
_mult[0][4]->fill();
}
else if (id == 3324) {
_mult[0][5]->fill();
}
else if (id == 3334) {
_mult[0][6]->fill();
}
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// multiplicities
vector<CounterPtr> scales = {_weightSum_Ups1,_weightSum_cont};
for(unsigned int ix=0;ix<2;++ix) {
if(scales[ix]->effNumEntries()<=0.) continue;
for(unsigned int iy=0;iy<7;++iy) {
Scatter2DPtr scatter;
book(scatter, ix+1, 1, iy+1, true);
scale(_mult[ix][iy],1./ *scales[ix]);
scatter->point(0).setY(_mult[ix][iy]->val(),_mult[ix][iy]->err());
}
}
if(_weightSum_Ups1->val()>0.) {
scale(_hist_ups1_lambda,1./ *_weightSum_Ups1);
scale(_hist_ups1_xi ,1./ *_weightSum_Ups1);
}
if(_weightSum_Ups2->val()>0.) {
scale(_hist_ups2_lambda,1./ *_weightSum_Ups2);
scale(_hist_ups2_xi ,1./ *_weightSum_Ups2);
}
if(_weightSum_cont->val()) {
scale(_hist_cont_lambda1, 1./ *_weightSum_cont);
scale(_hist_cont_lambda2, 1./ *_weightSum_cont);
scale(_hist_cont_xi , 1./ *_weightSum_cont);
}
}
//@}
/// @name Histograms
//@{
Histo1DPtr _hist_ups1_lambda, _hist_ups2_lambda, _hist_cont_lambda1, _hist_cont_lambda2;
Histo1DPtr _hist_ups1_xi, _hist_ups2_xi, _hist_cont_xi;
CounterPtr _mult[2][7];
CounterPtr _weightSum_cont,_weightSum_Ups1,_weightSum_Ups2;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ARGUS_1988_I251097);
}
|