Rivet analyses

title: MC_PARTONICTOPS

Plot partonic top properties (requires tops in event record)

Experiment: ()

Status: VALIDATED

Authors: - Andy Buckley

References: none listed

Beams: * *

Beam energies: ANY

Run details: - Any events containing partonic tops

Just looks for final, i.e. post-QCD and weakly decaying, top quarks in the event record and plots their multiplicities, transverse momentum spectra, and rapidity distribution, both inclusively and classified by decay mode.

Source code:MC_PARTONICTOPS.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/PartonicTops.hh"

namespace Rivet {

/// Find and plot partonic top properties (requires tops in event record) class MC_PARTONICTOPS : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MC_PARTONICTOPS);


/// @name Analysis methods
/// @{

/// Book histograms and initialise projections before the run
void init() {

  // Initialise and register projections
  declare(PartonicTops(TopDecay::ALL), "AllTops");
  declare(PartonicTops(TopDecay::ALL, PromptEMuFromTau::YES, InclHadronicTau::NO, Cuts::OPEN,
                       WhichTop::FIRST),
          "AllTopsFirst");
  declare(PartonicTops(TopDecay::E_MU), "LeptonicTops");
  declare(PartonicTops(TopDecay::HADRONIC), "HadronicTops");

  // Book histograms
  book(_h_tall_n, "t_all_n", linspace(5, -0.5, 4.5));
  book(_h_tall_pt, "t_all_pT", logspace(50, 1, 500));
  book(_h_tall_y, "t_all_y", linspace(50, -5, 5));

  book(_h_tall_n_first, "t_all_n_firsttop", linspace(5, -0.5, 4.5));
  book(_h_tall_pt_first, "t_all_pT_firsttop", logspace(50, 1, 500));
  book(_h_tall_y_first, "t_all_y_firsttop", linspace(50, -5, 5));

  book(_h_tall_pt_dfirstlast, "t_all_pT_dfirstlast", linspace(100, -100, 100));
  book(_p_tall_pt_dfirstlast, "t_all_pT_dfirstlast_prof", logspace(50, 1, 500));

  book(_h_tlep_n, "t_lep_n", linspace(5, -0.5, 4.5));
  book(_h_tlep_pt, "t_lep_pT", logspace(50, 1, 500));
  book(_h_tlep_y, "t_lep_y", linspace(50, -5, 5));

  book(_h_thad_n, "t_had_n", linspace(5, -0.5, 4.5));
  book(_h_thad_pt, "t_had_pT", logspace(50, 1, 500));
  book(_h_thad_y, "t_had_y", linspace(50, -5, 5));
}


/// Perform the per-event analysis
void analyze(const Event& event) {

  // Last tops (standard)
  const Particles& alltops = apply<PartonicTops>(event, "AllTops").particlesByPt();
  _h_tall_n->fill(alltops.size());
  for (const Particle& t : alltops) {
    _h_tall_pt->fill(t.pT() / GeV);
    _h_tall_y->fill(t.rap());
  }

  // First tops
  const Particles& alltops_first = apply<PartonicTops>(event, "AllTopsFirst").particlesByPt();
  _h_tall_n_first->fill(alltops_first.size());
  for (const Particle& t : alltops_first) {
    _h_tall_pt_first->fill(t.pT() / GeV);
    _h_tall_y_first->fill(t.rap());
  }

  // Match first and last tops
  for (const Particle& tf : alltops_first) {
    for (const Particle& tl : alltops) {
      //if (deltaR(tf, tl) > 1) continue;
      if (tf.pid() != tl.pid()) continue;
      const double dpt = tl.pT() - tf.pT(); //< defined as change due to PS
      _h_tall_pt_dfirstlast->fill(dpt / GeV);
      _p_tall_pt_dfirstlast->fill(tf.pT() / GeV, fabs(dpt) / GeV);
    }
  }

  // Leptonic (last) tops
  const Particles& leptops = apply<PartonicTops>(event, "LeptonicTops").particlesByPt();
  _h_tlep_n->fill(leptops.size());
  for (const Particle& t : leptops) {
    _h_tlep_pt->fill(t.pT() / GeV);
    _h_tlep_y->fill(t.rap());
  }

  // Hadronic (last) tops
  const Particles& hadtops = apply<PartonicTops>(event, "HadronicTops").particlesByPt();
  _h_thad_n->fill(hadtops.size());
  for (const Particle& t : hadtops) {
    _h_thad_pt->fill(t.pT() / GeV);
    _h_thad_y->fill(t.rap());
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  normalize(_h_tall_n);
  normalize(_h_tall_n_first);
  normalize(_h_tlep_n);
  normalize(_h_thad_n);
  normalize(_h_tall_pt);
  normalize(_h_tall_pt_first);
  normalize(_h_tlep_pt);
  normalize(_h_thad_pt);
  normalize(_h_tall_y);
  normalize(_h_tall_y_first);
  normalize(_h_tlep_y);
  normalize(_h_thad_y);
  normalize(_h_tall_pt_dfirstlast);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_tall_n, _h_tall_n_first, _h_tlep_n, _h_thad_n;
Histo1DPtr _h_tall_pt, _h_tall_pt_first, _h_tlep_pt, _h_thad_pt;
Histo1DPtr _h_tall_y, _h_tall_y_first, _h_tlep_y, _h_thad_y;
Histo1DPtr _h_tall_pt_dfirstlast;
Profile1DPtr _p_tall_pt_dfirstlast;
/// @}

};

RIVET_DECLARE_PLUGIN(MC_PARTONICTOPS);

} ```