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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:
  • Hannes Jung
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
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4#include "Rivet/Projections/FinalState.hh"
 5
 6namespace Rivet {
 7
 8
 9  class CMS_2015_I1384119 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2015_I1384119);
14
15
16    /// Book histograms and initialise projections before the run
17    void init() {
18      const FinalState fsa(Cuts::abseta < 20);
19      declare(fsa, "FSA");
20      const ChargedFinalState cfs(Cuts::abseta < 2);
21      declare(cfs, "CFS");
22
23      book(_hist_dNch_dEta_inel ,1, 1, 1);
24    }
25
26
27    /// Perform the per-event analysis
28    void analyze(const Event& event) {
29      // Apply inelastic selection (veto pp -> pp elastic events)
30      const FinalState& fsa = apply<FinalState>(event, "FSA");
31      if (fsa.size() <= 2) vetoEvent;
32
33      const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
34      for (const Particle& p : cfs.particles()) {
35        const int id = p.abspid();
36        // continue if particle is a proton, a kaon or a pion
37        if (id == 211 || id == 321 || id == 2212) ///< @todo Use PID:: ID constants
38          _hist_dNch_dEta_inel->fill(p.eta(), 1.0);
39      }
40    }
41
42
43    /// Normalise histograms etc., after the run
44    void finalize() {
45      scale(_hist_dNch_dEta_inel,  1/sumOfWeights());
46    }
47
48
49  private:
50
51    /// Histograms
52    Histo1DPtr _hist_dNch_dEta_inel;
53
54  };
55
56
57  RIVET_DECLARE_PLUGIN(CMS_2015_I1384119);
58
59}