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Rivet analyses reference
CMS_2015_I1384119
Pseudorapidity distribution of charged hadrons in proton--proton collisions at $\sqrt{s} = 13$ TeV
Experiment: CMS (LHC)
Inspire ID: 1384119
Status: VALIDATED
Authors:
References:
Beams: p+ p+
Beam energies: (6500.0, 6500.0) GeV
Run details:
- $\sqrt{s}=13$ TeV, $pp$ inelastic events, no $p_T$ cut on partons
The pseudorapidity distribution of charged hadrons in $pp$ collisions at $\sqrt{s} =13$ TeV is measured using a data sample obtained with the CMS detector, operated at zero magnetic field, at the CERN LHC. The yield of primary charged long-lived hadrons produced in inelastic $pp$ collisions is determined in the central region of the CMS pixel detector ($|eta| < 2$) using both hit pairs and reconstructed tracks.
Source code:
CMS_2015_I1384119.cc
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60 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
class CMS_2015_I1384119 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2015_I1384119);
/// Book histograms and initialise projections before the run
void init() {
const FinalState fsa(Cuts::abseta < 20);
declare(fsa, "FSA");
const ChargedFinalState cfs(Cuts::abseta < 2);
declare(cfs, "CFS");
book(_hist_dNch_dEta_inel ,1, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Apply inelastic selection (veto pp -> pp elastic events)
const FinalState& fsa = apply<FinalState>(event, "FSA");
if (fsa.size() <= 2) vetoEvent;
const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
for (const Particle& p : cfs.particles()) {
const int id = p.abspid();
// continue if particle is a proton, a kaon or a pion
if (id == 211 || id == 321 || id == 2212) ///< @todo Use PID:: ID constants
_hist_dNch_dEta_inel->fill(p.eta(), 1.0);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_hist_dNch_dEta_inel, 1/sumOfWeights());
}
private:
/// Histograms
Histo1DPtr _hist_dNch_dEta_inel;
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(CMS_2015_I1384119);
}
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