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## Rivet analyses reference

### ATLAS_2016_I1467230

Track-based minimum bias with low-pT tracks at 13 TeV
Experiment: ATLAS (LHC)
Inspire ID: 1467230
Status: VALIDATED
Authors:
• Roman Lysak
References:
Beams: p+ p+
Beam energies: (6500.0, 6500.0) GeV
Run details:
• $pp$ QCD interactions at 13 TeV. Diffractive events should be included. Multiple kinematic cuts should not be required.

Measurements of distributions of charged particles produced in proton-proton collisions with a centre-of-mass energy of 13 TeV are presented. The data were recorded by the ATLAS detector at the LHC and correspond to an integrated luminosity of 151 $\mu$b$^{-1}$. The particles are required to have a transverse momentum greater than 100 MeV and an absolute pseudorapidity less than 2.5. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the dependence of the mean transverse momentum on multiplicity are measured in events containing at least two charged particles satisfying the above kinematic criteria. The results are corrected for detector effects and compared to the predictions from several Monte Carlo event generators.

Source code: ATLAS_2016_I1467230.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" namespace Rivet { /// @brief ATLAS 13 TeV minimum bias analysis for low-pT tracks class ATLAS_2016_I1467230 : public Analysis { public: /// Particle types included enum PartTypes { k_NoStrange, k_AllCharged, kNPartTypes }; /// Phase space regions enum regionID { k_pt100_nch2_eta25, kNregions }; /// Default constructor DEFAULT_RIVET_ANALYSIS_CTOR(ATLAS_2016_I1467230); /// Initialization, called once before running void init() { for (int iT = 0; iT < kNPartTypes; ++iT) { for (int iR = 0; iR < kNregions; ++iR) { book(_sumW[iT][iR], "_sumW" + to_str(iT) + to_str(iR)); } } // Initialize and register projections declare(ChargedFinalState(Cuts::abseta < 2.5 && Cuts::pT > 100*MeV), "CFS100_25"); for (int iT = 0; iT < kNPartTypes; ++iT) { for (int iR = 0; iR < kNregions; ++iR) { book(_hist_nch [iT][iR], 1, iR + 1, iT + 1); book(_hist_pt [iT][iR], 2, iR + 1, iT + 1); book(_hist_eta [iT][iR], 3, iR + 1, iT + 1); book(_hist_ptnch[iT][iR], 4, iR + 1, iT + 1); } } } /// Fill histograms for the given particle selection and phase-space region void fillPtEtaNch(const Particles& particles, int ptype, int iRegion) { // Skip if event fails multiplicity cut const size_t nch = particles.size(); if (nch < 2) return; _sumW[ptype][iRegion]->fill(); // Fill nch _hist_nch[ptype][iRegion]->fill(nch); // Loop over particles, fill pT, eta and ptnch for (const Particle& p : particles) { const double pt = p.pT()/GeV; const double eta = p.eta(); _hist_pt [ptype][iRegion]->fill(pt , 1.0/pt); _hist_eta [ptype][iRegion]->fill(eta); _hist_ptnch[ptype][iRegion]->fill(nch, pt); } } /// Per-event analysis void analyze(const Event& event) { // Get all charged particles const ChargedFinalState& cfs = apply(event, "CFS100_25"); const Particles& pall = cfs.particles(); // Get charged particles, filtered to omit charged strange baryons const Cut& pcut = Cuts::abspid != PID::SIGMAMINUS && Cuts::abspid != PID::SIGMAPLUS && Cuts::abspid != PID::XIMINUS && Cuts::abspid != PID::OMEGAMINUS; const Particles& pnostrange = cfs.particles(pcut); // Fill all histograms for (int iR = 0; iR < kNregions; ++iR) { fillPtEtaNch(pall, k_AllCharged, iR); fillPtEtaNch(pnostrange, k_NoStrange, iR); } } /// Post-run data manipulation void finalize() { // Scale all histograms for (int iT = 0; iT < kNPartTypes; ++iT) { for (int iR = 0; iR < kNregions; ++iR) { if (_sumW[iT][iR]->val() > 0) { scale(_hist_nch[iT][iR], 1.0/ *_sumW[iT][iR]); scale(_hist_pt [iT][iR], 1.0/ dbl(*_sumW[iT][iR])/TWOPI/5.); scale(_hist_eta[iT][iR], 1.0/ *_sumW[iT][iR]); } } } } private: /// Weight sums CounterPtr _sumW[kNPartTypes][kNregions]; /// @name Histogram arrays //@{ Histo1DPtr _hist_nch [kNPartTypes][kNregions]; Histo1DPtr _hist_pt [kNPartTypes][kNregions]; Histo1DPtr _hist_eta [kNPartTypes][kNregions]; Profile1DPtr _hist_ptnch [kNPartTypes][kNregions]; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(ATLAS_2016_I1467230); }