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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/DISKinematics.hh"
#include "Rivet/Projections/DISLepton.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/DISRapidityGap.hh"
namespace Rivet {
/// @brief Neutral strange particle production in deep inelastic scattering at HERA (ZEUS)
class ZEUS_1995_I395196 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ZEUS_1995_I395196);
void init() {
declare(DISLepton(), "Lepton");
declare(DISKinematics(), "Kinematics");
declare(DISRapidityGap(), "Rapidity Gap");
const Cut cut = Cuts::abseta < 1.3;
const FinalState fs(cut);
declare(fs, "FS");
const ChargedFinalState cfs(cut);
declare(cfs, "CFS");
// take binning from reference data using HEPData ID (digits in "d01-x01-y01" etc.)
book(_h["pT_kaon"], 1, 1, 1);
book(_h["eta_kaon"], 2, 1, 1);
book(_h["pT_lambda"], 3, 1, 1);
book(_h["eta_lambda"], 4, 1, 1);
book(_h_multK0_0,"TMP/mult_0", refData(5,1,1));
book(_h_multK0_1,"TMP/mult_1", refData(5,1,1));
book(_h_multK0_2,"TMP/mult_2", refData(6,1,1));
book(_h_multK0_3,"TMP/mult_3", refData(6,1,1));
book(_h_scatratio, 6, 1, 1);
book(_h["K0_NRG_data_pT"], 7, 1, 1);
book(_h["K0_LRG_data_pT"], 8, 1, 1);
book(_h["K0_NRG_data_eta"], 9, 1, 1);
book(_h["K0_LRG_data_eta"], 10, 1, 1);
book(_h_scat,5,1,1);
book(_c["dis"],"TMP/Nevt_after_cuts");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
const DISKinematics& dk = applyProjection<DISKinematics>(event, "Kinematics");
const DISRapidityGap& g = applyProjection<DISRapidityGap>(event, "Rapidity Gap");
const ChargedFinalState& charged = apply<ChargedFinalState>(event, "CFS");
const size_t numPartcharged = charged.particles().size();
//const size_t numPart = fs.particles().size();
//_c["charged"] -> fill(numPartcharged);
//_c["all"] -> fill(numPart);
const size_t numParticles = fs.particles().size();
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
double rgap = g.gap();
// Get the DIS kinematics
double xbj = dk.x();
double ybj = dk.y();
double Q2 = dk.Q2()/GeV;
double W = sqrt(dk.W2()/GeV);
bool cut = Q2 >10 && Q2<640 && xbj>0.0003 && xbj<0.01 && ybj>0.04 && ybj<1.0;
if (!cut) vetoEvent;
_h_multK0_1 -> fill(Q2);
_h_multK0_2 -> fill(Q2,numPartcharged);
_c["dis"] -> fill();
int kaon=0;
int lambda=0;
for(const Particle& p : fs.particles()){
const double eta= p.eta();
const double pT = p.pT()/GeV;
const int pid = abs(p.pid());
//const double ybj= (p.E()-p.pz())/(2*27.5);
if (pid == 310 || pid == 130) { //K0S
//cout << " pid " << pid << " eta " << eta << endl;
if (pT>0.5 && pT<4.0){
kaon++ ;
//fill histograms related to the kaons in here.
_h["pT_kaon"] -> fill(pT,0.5/pT);
_h["eta_kaon"] -> fill(eta);
_h_multK0_0 -> fill(Q2);
_h_multK0_3 -> fill(Q2);
if(rgap<1.5 && W>140.0 ) {
_h["K0_LRG_data_pT"] -> fill(pT,0.5/pT);
_h["K0_LRG_data_eta"] -> fill(eta);
//cout<< abs(eta) <<endl;
}
else if(rgap>1.5 && W>140.0) {
_h["K0_NRG_data_pT"] -> fill(pT,0.5/pT);
_h["K0_NRG_data_eta"] -> fill(eta);
}
}
}
else if (pid==3122){ // Lambda
if (pT>0.5 && pT<3.5){
lambda++ ;
//fill histograms related to the lambdas in here.
_h["pT_lambda"] -> fill(pT,0.5/pT);
_h["eta_lambda"] -> fill(eta);
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
divide(_h_multK0_0, _h_multK0_1, _h_scat);
divide(_h_multK0_3, _h_multK0_2, _h_scatratio);
//cout<< "#of kaons per events"<< kaon/numEvents() <<endl;
//cout<< "Num mean charged p multiplicity"<< *_c["charged"]<< endl;
scale(_h["pT_kaon"],1./ *_c["dis"]);
scale(_h["eta_kaon"],1./ *_c["dis"]);
scale(_h["pT_lambda"],1./ *_c["dis"]);
scale(_h["eta_lambda"],1./ *_c["dis"]);
scale(_h["K0_LRG_data_pT"],1./ *_c["dis"]);
scale(_h["K0_NRG_data_pT"],1./ *_c["dis"]);
scale(_h["K0_LRG_data_eta"],1./ *_c["dis"]);
scale(_h["K0_NRG_data_eta"],1./ *_c["dis"]);
}
///@}
/// @name Histograms
///@{
map<string, Histo1DPtr> _h;
map<string, Profile1DPtr> _p;
map<string, CounterPtr> _c;
///@}
private:
Scatter2DPtr _h_scat, _h_scatratio ;
Histo1DPtr _h_multK0_0 , _h_multK0_1 ,_h_multK0_2 ,_h_multK0_3 ;
};
RIVET_DECLARE_PLUGIN(ZEUS_1995_I395196);
}
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