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## Rivet analyses reference

### MC_PHOTONKTSPLITTINGS

Monte Carlo validation observables for photon + jets production
Experiment: ()
Status: VALIDATED
Authors:
• Frank Siegert
No references listed
Beams: * *
Beam energies: ANY
Run details:
• Tevatron Run II ppbar -> gamma + jets.

Monte Carlo validation observables for photon + jets production

Source code: MC_PHOTONKTSPLITTINGS.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 // -*- C++ -*- #include "Rivet/Analyses/MC_JetSplittings.hh" #include "Rivet/Projections/LeadingParticlesFinalState.hh" #include "Rivet/Projections/VetoedFinalState.hh" #include "Rivet/Projections/FastJets.hh" namespace Rivet { /// @brief MC validation analysis for photon + jets events class MC_PHOTONKTSPLITTINGS : public MC_JetSplittings { public: /// Default constructor MC_PHOTONKTSPLITTINGS() : MC_JetSplittings("MC_PHOTONKTSPLITTINGS", 4, "Jets") { } /// @name Analysis methods //@{ /// Book histograms void init() { // General FS FinalState fs(-5.0, 5.0); declare(fs, "FS"); // Get leading photon LeadingParticlesFinalState photonfs(FinalState(-1.0, 1.0, 30.0*GeV)); photonfs.addParticleId(PID::PHOTON); declare(photonfs, "LeadingPhoton"); // FS for jets excludes the leading photon VetoedFinalState vfs(fs); vfs.addVetoOnThisFinalState(photonfs); declare(vfs, "JetFS"); FastJets jetpro(vfs, FastJets::KT, 0.6); declare(jetpro, "Jets"); MC_JetSplittings::init(); } /// Do the analysis void analyze(const Event& e) { // Get the photon const Particles photons = apply(e, "LeadingPhoton").particles(); if (photons.size() != 1) { vetoEvent; } const FourMomentum photon = photons.front().momentum(); // Get all charged particles const FinalState& fs = apply(e, "JetFS"); if (fs.empty()) { vetoEvent; } // Isolate photon by ensuring that a 0.4 cone around it contains less than 7% of the photon's energy const double egamma = photon.E(); double econe = 0.0; foreach (const Particle& p, fs.particles()) { if (deltaR(photon, p.momentum()) < 0.4) { econe += p.E(); // Veto as soon as E_cone gets larger if (econe/egamma > 0.07) { vetoEvent; } } } MC_JetSplittings::analyze(e); } // Finalize void finalize() { MC_JetSplittings::finalize(); } //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(MC_PHOTONKTSPLITTINGS); }