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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief gamma gamma -> pi+ pi-
class MARKII_1990_I304882 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1990_I304882);
/// @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()<0.35*GeV || sqrtS()>1.6*GeV)
throw Error("Invalid CMS energy for MARKII_1990_I304882");
for(unsigned int ix=0;ix<7;++ix) {
std::ostringstream title;
title << "/TMP/nPi_" << ix;
book(_cPi[ix], title.str());
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
Particles part = applyProjection<FinalState>(event,"FS").particles();
if(part.size()!=2) vetoEvent;
double cTheta(0.);
bool foundP(false),foundM(false);
for(const Particle & p : part) {
if(p.pid()==PID::PIPLUS) {
foundP=true;
cTheta = abs(p.momentum().z()/p.momentum().p3().mod());
}
else if(p.pid()==PID::PIMINUS)
foundM=true;
}
if(!foundP || !foundM) vetoEvent;
int ibin = cTheta/0.1;
if(ibin>5) vetoEvent;
_cPi[ 0 ]->fill();
_cPi[ibin+1]->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = crossSection()/nanobarn/sumOfWeights();
for(unsigned int ih=0;ih<7;++ih) {
unsigned int ix=2,iy=ih;
if(ih==0) {
ix=1;
iy=1;
}
double sigma = _cPi[ih]->val()*fact;
double error = _cPi[ih]->err()*fact;
Scatter2D temphisto(refData(ix, 1, iy));
Scatter2DPtr mult;
book(mult, ix, 1, iy);
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)) {
mult->addPoint(x, sigma, ex, make_pair(error,error));
}
else {
mult->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
}
///@}
/// @name Histograms
///@{
CounterPtr _cPi[7];
///@}
};
RIVET_DECLARE_PLUGIN(MARKII_1990_I304882);
}
|