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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/RivetAIDA.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
/// @brief D0 measurement of the ratio \f$ \sigma(Z/\gamma^* + n \text{ jets})/\sigma(Z/\gamma^*) \f$
class D0_2008_S6879055 : public Analysis {
public:
/// Default constructor.
D0_2008_S6879055() : Analysis("D0_2008_S6879055")
{
}
/// @name Analysis methods
//@{
// Book histograms
void init() {
ZFinder zfinder(-MAXRAPIDITY, MAXRAPIDITY, 0.0*GeV, ELECTRON,
40.0*GeV, 200.0*GeV, 0.2, true, true);
addProjection(zfinder, "ZFinder");
FastJets conefinder(zfinder.remainingFinalState(), FastJets::D0ILCONE, 0.5);
addProjection(conefinder, "ConeFinder");
_crossSectionRatio = bookHistogram1D(1, 1, 1);
_pTjet1 = bookHistogram1D(2, 1, 1);
_pTjet2 = bookHistogram1D(3, 1, 1);
_pTjet3 = bookHistogram1D(4, 1, 1);
}
/// Do the analysis
void analyze(const Event& event) {
const double weight = event.weight();
const ZFinder& zfinder = applyProjection<ZFinder>(event, "ZFinder");
if (zfinder.bosons().size()!=1) {
vetoEvent;
}
FourMomentum e0 = zfinder.constituents()[0].momentum();
FourMomentum e1 = zfinder.constituents()[1].momentum();
const double e0eta = e0.eta();
const double e0phi = e0.phi();
const double e1eta = e1.eta();
const double e1phi = e1.phi();
vector<FourMomentum> finaljet_list;
foreach (const Jet& j, applyProjection<JetAlg>(event, "ConeFinder").jetsByPt(20.0*GeV)) {
const double jeta = j.momentum().eta();
const double jphi = j.momentum().phi();
if (fabs(jeta) < 2.5) {
if (deltaR(e0eta, e0phi, jeta, jphi) > 0.4 &&
deltaR(e1eta, e1phi, jeta, jphi) > 0.4) {
finaljet_list.push_back(j.momentum());
}
}
}
// For normalisation of crossSection data (includes events with no jets passing cuts)
_crossSectionRatio->fill(0, weight);
// Fill jet pT and multiplicities
if (finaljet_list.size() >= 1) {
_crossSectionRatio->fill(1, weight);
_pTjet1->fill(finaljet_list[0].pT(), weight);
}
if (finaljet_list.size() >= 2) {
_crossSectionRatio->fill(2, weight);
_pTjet2->fill(finaljet_list[1].pT(), weight);
}
if (finaljet_list.size() >= 3) {
_crossSectionRatio->fill(3, weight);
_pTjet3->fill(finaljet_list[2].pT(), weight);
}
if (finaljet_list.size() >= 4) {
_crossSectionRatio->fill(4, weight);
}
}
/// Finalize
void finalize() {
// Now divide by the inclusive result
_crossSectionRatio->scale(1.0/_crossSectionRatio->binHeight(0));
// Normalise jet pTs to integrals of data
// NB. There is no other way to do this, because these quantities are not
// detector-corrected
normalize(_pTjet1, 10439.0); // fixed norm OK
normalize(_pTjet2, 1461.5); // fixed norm OK
normalize(_pTjet3, 217.0); // fixed norm OK
}
//@}
private:
/// @name Histograms
//@{
AIDA::IHistogram1D * _crossSectionRatio;
AIDA::IHistogram1D * _pTjet1;
AIDA::IHistogram1D * _pTjet2;
AIDA::IHistogram1D * _pTjet3;
//@}
};
// The hook for the plugin system
DECLARE_RIVET_PLUGIN(D0_2008_S6879055);
}

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