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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief gamma gamma -> pi+pi-/K+ K-
class MARKII_1984_I195739 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1984_I195739);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
declare(FinalState(),"FS");
// check CMS energy in range
if(sqrtS()<1.6*GeV || sqrtS()>2.5*GeV)
throw Error("Invalid CMS energy for MARKII_1984_I195739");
book(_cPiK, "/TMP/nPiK_");
}
/// 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>0.3) vetoEvent;
_cPiK->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = crossSection()/nanobarn/sumOfWeights();
double sigma = _cPiK->val()*fact;
double error = _cPiK->err()*fact;
Scatter2D temphisto(refData(1, 1, 1));
Scatter2DPtr cross;
book(cross, 1, 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 _cPiK;
///@}
};
RIVET_DECLARE_PLUGIN(MARKII_1984_I195739);
}
|