Rivet analyses

title: ALICE_2010_I852264

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++ // -- 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