Rivet analyses

title: CDF_1990_I283352

CDF pseudorapidity distributions at 630 and 1800 GeV

Experiment: CDF (Tevatron Run 0)

Inspire ID: 283352

Status: VALIDATED

Authors: - Andy Buckley

References: - Phys.Rev.D41:2330,1990 - DOI: 10.1103/PhysRevD.41.2330

Beams: p- p+

Beam energies: (900.0, 900.0); (315.0, 315.0)GeV

Run details: - QCD min bias events at $\sqrt{s} = 630$ and 1800 GeV. Particles with $c \tau > 10$~mm should be set stable.

Pseudorapidity distributions based on the CDF 630 and 1800 GeV runs from 1987. All data is detector corrected. The data confirms the UA5 measurement of a $\mathrm{d}{N}/\mathrm{d}{\eta}$ rise with energy faster than $\ln{\sqrt{s}}$, and as such this analysis is important for constraining the energy evolution of minimum bias and underlying event characteristics in MC simulations.

Source code:CDF_1990_I283352.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/ChargedFinalState.hh"

include "Rivet/Projections/TriggerCDFRun0Run1.hh"

namespace Rivet {

/// @brief CDF pseudorapidity analysis at 630 and 1800 GeV /// /// @author Andy Buckley class CDF_1990_I283352 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(CDF_1990_I283352);


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

void init() {
  // Setup projections
  declare(TriggerCDFRun0Run1(), "Trigger");
  declare(ChargedFinalState(Cuts::abseta < 3.5), "CFS");

  // Book histo
  for (double eVal : allowedEnergies()) {
    size_t ih = eVal < 1000;
    if (isCompatibleWithSqrtS(eVal)) _sqs = ih;
    book(_h[ih], 3 + ih, 1, 1);
    book(_c[ih], "TMP/sumWTrig_" + toString(ih));
  }
  raiseBeamErrorIf(_sqs > 1);
}


/// Do the analysis
void analyze(const Event& event) {
  // Trigger
  const bool trigger = apply<TriggerCDFRun0Run1>(event, "Trigger").minBiasDecision();
  if (!trigger) vetoEvent;
  _c[_sqs]->fill();

  // Loop over final state charged particles to fill eta histos
  const FinalState& fs = apply<FinalState>(event, "CFS");
  for (const Particle& p : fs.particles()) {
    _h[_sqs]->fill(p.abseta());
  }
}


/// Finalize
void finalize() {
  // Divide through by num events to get d<N>/d(eta) in bins
  // Factor of 1/2 for |eta| -> eta
  scale(_c, crossSectionPerEvent());
  scale(_h, crossSectionPerEvent());
  for (size_t ih = 0; ih < 2; ++ih) {
    if (_c[ih]->sumW()) scale(_h[ih], 0.5 / *_c[ih]);
  }
}

/// @}

private:

/// Counter
CounterPtr _c[2];

/// Histogram
Histo1DPtr _h[2];

size_t _sqs = 2;

};

RIVET_DECLARE_ALIASED_PLUGIN(CDF_1990_I283352, CDF_1990_S2089246);

} ```

Aliases: - CDF_1990_S2089246