Rivet analyses reference

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    RIVET_DEFAULT_ANALYSIS_CTOR(TOTEM_2014_I1328627);
13
14
15
16    void init() {
17      ChargedFinalState cfsm(Cuts::etaIn(-7.0, -6.0));
18      ChargedFinalState cfsp(Cuts::etaIn( 3.7,  4.8));
19      declare(cfsm, "CFSM");
20      declare(cfsp, "CFSP");
21
22      book(_h_eta ,1, 1, 1);
23      book(_sumofweights, "sumofweights");
24    }
25
26
27    void analyze(const Event& event) {
28      const ChargedFinalState cfsm = apply<ChargedFinalState>(event, "CFSM");
29      const ChargedFinalState cfsp = apply<ChargedFinalState>(event, "CFSP");
30      if (cfsm.size() == 0 && cfsp.size() == 0) vetoEvent;
31
32      _sumofweights->fill();
33      for (const Particle& p : cfsm.particles() + cfsp.particles()) {
34        _h_eta->fill(p.abseta());
35      }
36    }
37
38
39    void finalize() {
40      scale(_h_eta, 1./ *_sumofweights);
41    }
42
43
44  private:
45
46    CounterPtr _sumofweights;
47    Histo1DPtr _h_eta;
48
49  };
50
51
52  RIVET_DECLARE_PLUGIN(TOTEM_2014_I1328627);
53
54
55}