Rivet analyses

Pseudorapidities at three energies, charged multiplicity at 7 TeV

Experiment: ALICE (LHC)

Inspire ID: 852264

Status: VALIDATED

Authors: - Holger Schulz - Jan Fiete Grosse-Oetringhaus

References: - Eur.Phys.J. C68 (2010) 345-354 - arXiv: 1004.3514

Beams: p+ p+

Beam energies: (450.0, 450.0); (1180.0, 1180.0); (3500.0, 3500.0)GeV

Run details: - Diffractive events need to be enabled.

This is an ALICE publication with pseudorapities for 0.9, 2.36 and $7~\TeV$ and the charged multiplicity at $7~\TeV$. The analysis requires at least on charged particle in the event. Only the INEL distributions are considered here.

Source code:ALICE_2010_I852264.cc

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {


  class ALICE_2010_I852264 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2010_I852264);


    /// @name Analysis methods
    /// @{

    /// Book histograms and initialise projections before the run
    void init() {

      ChargedFinalState cfs(Cuts::abseta < 1.0);
      declare(cfs, "CFS");

      size_t ih = 0;
      for (double eVal : allowedEnergies()) {

        const string en = toString(round(eVal));
        if (isCompatibleWithSqrtS(eVal))  _sqs = en;

        book(_h[en+"dN_deta"], 4+ih, 1, 1);
        if (ih == 2)  book(_h["dN_dNch"], 3, 1, 1);
        book(_c[en], "TMP/Nevt_after_cuts_"+en);
        ++ih;
      }
      raiseBeamErrorIf(_sqs.empty());
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const ChargedFinalState& charged = apply<ChargedFinalState>(event, "CFS");
      if (charged.size() < 1)  vetoEvent;
      _c[_sqs]->fill();
      if (_sqs == "7000"s)  _h["dN_dNch"]->fill(charged.size());

      for (const Particle& p : charged.particles()) {
        const double eta = p.eta();
        _h[_sqs+"dN_deta"]->fill(eta);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_h, crossSectionPerEvent());
      scale(_c, crossSectionPerEvent());
      for (const auto& item : _c) {
        if (item.second->sumW() == 0)  continue;
        scale(_h[item.first+"dN_deta"], 1.0/item.second->sumW());
      }
      //for (double eVal : allowedEnergies()) {
      //  const string en = toString(round(eVal));
      //  if (_c[en]->sumW() == 0)  continue;
      //  scale(_h[en+"dN_deta"], 1.0/ *_c[en]);
      //}
      normalize(_h["dN_dNch"]);
    }

    /// @}


  private:

    /// @name Histograms
    /// @{
    map<string,Histo1DPtr> _h;
    map<string, CounterPtr> _c;

    string _sqs = "";
    /// @}

  };



  RIVET_DECLARE_ALIASED_PLUGIN(ALICE_2010_I852264, ALICE_2010_S8625980);

}

Aliases: - ALICE_2010_S8625980