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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/DressedLeptons.hh"
#include "Rivet/Projections/MissingMomentum.hh"
#include "Rivet/Projections/PromptFinalState.hh"
namespace Rivet {
/// @brief gamma gamma -> pi+pi-/K+ K-
class TPC_1986_I228072 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TPC_1986_I228072);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Final state
declare(FinalState(),"FS");
// check CMS energy in range
if(sqrtS()<0.5*GeV || sqrtS()>3.5*GeV)
throw Error("Invalid CMS energy for TPC_1986_I228072");
book(_cPi[0],"/TMP/nPi_06");
book(_cPi[1],"/TMP/nPi_03");
book(_cK ,"/TMP/nK" );
}
/// Perform the per-event analysis
void analyze(const Event& event) {
Particles part = applyProjection<FinalState>(event,"FS").particles();
if(part.size()!=2) vetoEvent;
if(part[0].pid()!=-part[1].pid()) vetoEvent;
double cTheta(0.);
bool foundPi(false),foundK(false);
for(const Particle & p : part) {
if(p.pid()==PID::PIPLUS) {
foundPi=true;
cTheta = abs(p.momentum().z()/p.momentum().p3().mod());
}
else if(p.pid()==PID::KPLUS) {
foundK=true;
cTheta = abs(p.momentum().z()/p.momentum().p3().mod());
}
}
if(!foundPi && !foundK) vetoEvent;
if(cTheta>0.6) vetoEvent;
if(foundPi) {
_cPi[0]->fill();
if(cTheta<0.3)
_cPi[1]->fill();
}
else if(foundK)
_cK->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = crossSection()/nanobarn/sumOfWeights();
for (unsigned int ih=1;ih<6;++ih) {
if(ih==2||ih==3) continue;
double sigma(0.),error(0.);
CounterPtr count;
if(ih==1) {
count = _cPi[0];
}
else if(ih==4) {
count = _cPi[1];
}
else if(ih==5) {
count = _cK;
}
else
assert(false);
if(count->numEntries()==0) continue;
sigma = count->val()*fact;
error = count->err()*fact;
Scatter2DPtr cross;
Scatter2D temphisto(refData(ih, 1, 1));
book(cross, ih, 1, 1);
for (size_t b = 0; b < temphisto.numPoints(); b++) {
const double x = temphisto.point(b).x();
pair<double,double> ex = temphisto.point(b).xErrs();
pair<double,double> ex2 = ex;
if(ex2.first ==0.) ex2. first=0.0001;
if(ex2.second==0.) ex2.second=0.0001;
if (inRange(sqrtS(), x-ex2.first, x+ex2.second)) {
cross->addPoint(x, sigma, ex, make_pair(error,error));
}
else {
cross->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
}
///@}
/// @name Histograms
///@{
CounterPtr _cPi[2],_cK;
///@}
};
RIVET_DECLARE_PLUGIN(TPC_1986_I228072);
}
|