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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/LeadingParticlesFinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
namespace Rivet {
/// @brief CDF angular distribution of prompt photon
class CDF_1993_S2742446 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(CDF_1993_S2742446);
void init() {
// The photon selection has been corrected to pTmin=22 GeV (vs. 23 in the trigger)
LeadingParticlesFinalState photonfs(FinalState(Cuts::abseta < 0.9 && Cuts::pT >= 22*GeV));
photonfs.addParticleId(PID::PHOTON);
declare(photonfs, "LeadingPhoton");
// FS excluding the leading photon
VetoedFinalState vfs(FinalState(Cuts::abseta < 4.2));
vfs.addVetoOnThisFinalState(photonfs);
declare(vfs, "VFS");
// Jets
declare(FastJets(vfs, FastJets::CDFJETCLU, 0.7), "Jets");
book(_h_costheta ,1, 1, 1);
}
void analyze(const Event& event) {
Particles photons = apply<LeadingParticlesFinalState>(event, "LeadingPhoton").particles();
if (photons.size()!=1 || photons[0].pT() > 45.0*GeV) vetoEvent;
FourMomentum leadingPhoton = photons[0].momentum();
double eta_P = leadingPhoton.eta();
double phi_P = leadingPhoton.phi();
// photon isolation: less than 2 GeV EM E_T
double Etsum=0.0;
for (const Particle& p : apply<VetoedFinalState>(event, "VFS").particles()) {
if (p.charge() != 0 && deltaR(eta_P, phi_P, p.eta(), p.phi()) < 0.7) Etsum += p.Et();
}
if (Etsum > 2*GeV) vetoEvent;
FourMomentum jetsum;
Jets jets = apply<FastJets>(event, "Jets").jets(Cuts::pT > 10*GeV, cmpMomByPt);
// Require at least one jet with pT>10 GeV
if (jets.size()==0) vetoEvent;
// Require the leading jet to be in the opposite (phi) hemisphere w.r.t. the photon
if (jets[0].phi() - phi_P <= M_PI) vetoEvent;
// sum all jets in the opposite hemisphere in phi from the photon
for (const Jet& jet : jets) {
if (fabs(jet.phi()-phi_P) > M_PI) jetsum+=jet.momentum();
}
// c.m. cuts, see Table 1
double etaboost = (jetsum.eta()+eta_P)/2.;
if (!inRange(etaboost, -1.2, 1.2)) vetoEvent;
double etastar = (jetsum.eta()-eta_P)/2.;
if (!inRange(etastar, -1.1, 1.1)) vetoEvent;
double pstar = photons[0].pT()*cosh(etastar);
if (!inRange(pstar, 27.8, 47.0)) vetoEvent;
const double costheta = fabs(tanh((eta_P-jetsum.eta())/2.0));
if (!inRange(costheta, 0., 0.8)) vetoEvent;
// Fill histo
_h_costheta->fill(costheta);
}
void finalize() {
/// @todo Take fixed norm direct from ref histo
normalize(_h_costheta, 1.4271); // fixed norm ok
}
private:
Histo1DPtr _h_costheta;
};
RIVET_DECLARE_ALIASED_PLUGIN(CDF_1993_S2742446, CDF_1993_I354237);
}
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