Rivet analyses

title: STAR_2008_I810030

Di-hadron correlations in $d$-Au at 200 GeV

Experiment: STAR (RHIC d-Au 200 GeV)

Inspire ID: 810030

Status: UNVALIDATED

Authors: - Christine Nattrass - Hendrik Hoeth

References: - arXiv: 0809.5261

Beams: p+ p+

Beam energies: (100.0, 100.0)GeV

Run details: - $d$-Au at 200 GeV, but use $pp$ Monte Carlo! See description.

Correlation in $\eta$ and $\phi$ between the charged hadron with the highest pT (trigger particle'') and the other charged hadrons in the event (associated particles''). The data was collected in d-Au collisions at 200 GeV. Nevertheless, it is very proton--proton like and can therefore be compared to $pp$ Monte Carlo (not for tuning, but for qualitative studies.)

Source code:STAR_2008_I810030.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {

/// STAR di-hadron correlations in d-Au at 200 GeV class STAR_2008_I810030 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(STAR_2008_I810030);


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

/// Book projections and histograms
void init() {
  ChargedFinalState fs((Cuts::etaIn(-1.0, 1.0) && Cuts::pT >= 1.0 * GeV));
  declare(fs, "FS");

  book(_h_Y_jet_trigger, 1, 1, 1);
  book(_h_Y_jet_associated, 2, 1, 1);
}


/// Do the analysis
void analyze(const Event& event) {
  // Skip if the event is empty
  const FinalState& fs = apply<FinalState>(event, "FS");
  if (fs.empty()) {
    MSG_DEBUG("Skipping event " << numEvents() << " because no final state found ");
    vetoEvent;
  }

  for (const Particle& tp : fs.particles()) {
    const double triggerpT = tp.pT();
    if (triggerpT >= 2.0 && triggerpT < 5.0) {
      int n_associated = 0;
      for (const Particle& ap : fs.particles()) {
        if (!inRange(ap.pT() / GeV, 1.5, triggerpT)) continue;
        if (deltaPhi(tp.phi(), ap.phi()) > 1) continue;
        if (fabs(tp.eta() - ap.eta()) > 1.75) continue;
        n_associated += 1;
      }
      //const double dPhidEta = 2 * 2*1.75;
      //_h_Y_jet_trigger->fill(triggerpT, n_associated/dPhidEta);
      _h_Y_jet_trigger->fill(triggerpT, n_associated);
    }
  }
}


/// Finalize
// void finalize() {    }

/// @}

private:

/// @name Histograms
/// @{
Profile1DPtr _h_Y_jet_trigger;
Profile1DPtr _h_Y_jet_associated;
/// @}

};

RIVET_DECLARE_ALIASED_PLUGIN(STAR_2008_I810030, STAR_2008_S7993412);

} ```

Aliases: - STAR_2008_S7993412