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CMS_2011_S9215166.cc
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CMS_2011_S9215166.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/RivetYODA.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
namespace Rivet {
class CMS_2011_S9215166 : public Analysis {
public:
/// Constructor
CMS_2011_S9215166() : Analysis("CMS_2011_S9215166"), _weightMB(0.), _weightDiJet(0.) { }
void init() {
const FinalState fs(-6.0, 6.0, 0.0*GeV);
addProjection(fs, "FS");
addProjection(FastJets(fs, FastJets::ANTIKT, 0.5), "Jets");
VetoedFinalState fsv(fs);
fsv.vetoNeutrinos();
fsv.addVetoPairDetail(MUON, 0.0*GeV, 99999.9*GeV);
addProjection(fsv, "fsv");
// For the MB ND selection
const ChargedFinalState fschrgd(-6.0,6.0,0.0*GeV);
addProjection(fschrgd, "fschrgd");
VetoedFinalState fschrgdv(fschrgd);
fschrgdv.vetoNeutrinos();
addProjection(fschrgdv, "fschrgdv");
if (fuzzyEquals(sqrtS()/GeV, 900, 1E-3)) {
_hist_mb = bookHisto1D(1, 1, 1); // energy flow in MB, 0.9 TeV
_hist_dijet = bookHisto1D(2, 1, 1); // energy flow in dijet events, 0.9 TeV
} else if (fuzzyEquals(sqrtS()/GeV, 7000, 1E-3)) {
_hist_mb = bookHisto1D(3, 1, 1); // energy flow in MB, 7 TeV
_hist_dijet = bookHisto1D(4, 1, 1); // energy flow in dijet events, 7 TeV
}
}
void analyze(const Event& event) {
const double weight = event.weight();
// Skip if the event is empty
const FinalState& fsv = applyProjection<FinalState>(event, "fsv");
if (fsv.empty()) vetoEvent;
// Veto diffractive topologies according to defined hadron level
double count_chrg_forward = 0;
double count_chrg_backward = 0;
const FinalState& fschrgdv = applyProjection<FinalState>(event, "fschrgdv");
foreach (const Particle& p, fschrgdv.particles()) {
if (3.9 < p.momentum().eta() && p.momentum().eta() < 4.4) count_chrg_forward++;
if (-4.4 < p.momentum().eta() && p.momentum().eta() < -3.9) count_chrg_backward++;
}
if (count_chrg_forward == 0 || count_chrg_backward == 0) vetoEvent;
/// @todo "Diffractive" veto should really also veto dijet events?
// MINIMUM BIAS EVENTS
_weightMB += weight;
foreach (const Particle& p, fsv.particles()) {
_hist_mb->fill(fabs(p.momentum().eta()), weight*p.momentum().E()/GeV);
}
// DIJET EVENTS
double PTCUT = -1.0;
if (fuzzyEquals(sqrtS()/GeV, 900, 1E-3)) PTCUT = 8.0*GeV;
else if (fuzzyEquals(sqrtS()/GeV, 7000, 1E-3)) PTCUT = 20.0*GeV;
const FastJets& jetpro = applyProjection<FastJets>(event, "Jets");
const Jets jets = jetpro.jetsByPt(PTCUT);
if (jets.size() >= 2) {
// eta cut for the central jets
if (fabs(jets[0].momentum().eta()) < 2.5 && fabs(jets[1].momentum().eta()) < 2.5) {
// Back to back condition of the jets
const double diffphi = deltaPhi(jets[1].momentum().phi(), jets[0].momentum().phi());
if (diffphi-PI < 1.0) {
_weightDiJet += weight;
foreach (const Particle& p, fsv.particles()) {
_hist_dijet->fill(fabs(p.momentum().eta()), weight*p.momentum().E()/GeV);
}
}
}
}
}
void finalize() {
scale(_hist_mb , 0.5/_weightMB );
scale(_hist_dijet, 0.5/_weightDiJet);
}
private:
Histo1DPtr _hist_mb, _hist_dijet;
double _weightMB,_weightDiJet;
};
// Hook for the plugin system
DECLARE_RIVET_PLUGIN(CMS_2011_S9215166);
}

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