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TOTEM_2014_I1328627

Forward charged particle pseudorapidity density in $pp$ collisions at $\sqrt{s} = 8 \text{TeV}$ using a displaced interaction point
Experiment: TOTEM (LHC)
Inspire ID: 1328627
Status: VALIDATED
Authors:
  • Sercan Sen
References:
  • EPJ C75,126
  • CERN-PH-EP-2014-260
  • arXiv: 1411.4963
Beams: p+ p+
Beam energies: (4000.0, 4000.0) GeV
Run details:
  • $pp$ QCD interactions at 8 TeV.

The pseudorapidity density of charged particles $\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$ is measured by the TOTEM experiment in $pp$ collisions at $\sqrt{s} = 8$ TeV within the ranges $3.9 < \eta < 4.7$ and $-6.95 < \eta < -6.9$. Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25\,m from the nominal interaction point. The data sample is expected to include 96--97\% of the inelastic proton--proton interactions. The measurement reported here considers charged particles with $p_T > 0$ MeV/$c$, produced in inelastic interactions with at least one charged particle in $-7 < \eta < -6$ or $3.7 < \eta < 4.8$. The $\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$ has been found to decrease with $|\eta|$, from $5.11 \pm 0.73$ at $\eta = 3.95$ to $1.81 \pm 0.56$ at $\eta = -6.925$.

Source code: TOTEM_2014_I1328627.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  class TOTEM_2014_I1328627 : public Analysis {
 9  public:
10
11
12    TOTEM_2014_I1328627()
13      : Analysis("TOTEM_2014_I1328627")
14    {    }
15
16
17
18    void init() {
19      ChargedFinalState cfsm(Cuts::etaIn(-7.0, -6.0));
20      ChargedFinalState cfsp(Cuts::etaIn( 3.7,  4.8));
21      declare(cfsm, "CFSM");
22      declare(cfsp, "CFSP");
23
24      book(_h_eta ,1, 1, 1);
25      book(_sumofweights, "sumofweights");
26    }
27
28
29    void analyze(const Event& event) {
30      const ChargedFinalState cfsm = apply<ChargedFinalState>(event, "CFSM");
31      const ChargedFinalState cfsp = apply<ChargedFinalState>(event, "CFSP");
32      if (cfsm.size() == 0 && cfsp.size() == 0) vetoEvent;
33
34      _sumofweights->fill();
35      for (const Particle& p : cfsm.particles() + cfsp.particles()) {
36        _h_eta->fill(p.abseta());
37      }
38    }
39
40
41    void finalize() {
42      scale(_h_eta, 1./ *_sumofweights);
43    }
44
45
46  private:
47
48    CounterPtr _sumofweights;
49    Histo1DPtr _h_eta;
50
51  };
52
53
54  // The hook for the plugin system
55  RIVET_DECLARE_PLUGIN(TOTEM_2014_I1328627);
56
57
58}