Rivet analyses

title: ALICE_2011_I881474

Strange particle production in proton-proton collisions at $\sqrt{s} = 0.9$ TeV with ALICE at the LHC.

Experiment: ALICE (LHC)

Inspire ID: 881474

Status: VALIDATED

Authors: - Pablo Bueno Gomez - Eva Sicking

References: - Eur.Phys.J.C71:1594,2011.

Beams: p+ p+

Beam energies: (450.0, 450.0)GeV

Run details: - Diffractive events need to be switched on.

Transverse momentum spectra of strange particles ($K^0_S$, $\Lambda$, $\phi$ and $\Xi$) in $pp$ collisions at $\sqrt{s} = 0.9$~TeV with ALICE at the LHC. The ratio of cross-sections as a function of pT for $\Lambda/K^0_S$ is also included.

Source code:ALICE_2011_I881474.cc

```c++

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

class ALICE_2011_I881474 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2011_I881474);


void init() {
  const UnstableParticles ufs(Cuts::abseta < 15);
  declare(ufs, "UFS");

  book(_histPtK0s, 1, 1, 1);
  book(_histPtLambda, 2, 1, 1);
  book(_histPtAntiLambda, 3, 1, 1);
  book(_histPtXi, 4, 1, 1);
  book(_histPtPhi, 5, 1, 1);
  book(_temp_h_Lambdas, "TMP/h_Lambdas", refData(6, 1, 1));
  book(_temp_h_Kzeros, "TMP/h_Kzeros", refData(6, 1, 1));
  book(_h_LamKzero, 6, 1, 1);
}


void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");

  for (const Particle& p : ufs.particles()) {
    const double absrap = p.absrap();
    const double pT = p.pT() / GeV;

    if (absrap < 0.8) {
      switch (p.pid()) {
        case 3312:
        case -3312:
          if (!(p.hasAncestorWith(Cuts::pid == 3334) || p.hasAncestorWith(Cuts::pid == -3334))) {
            _histPtXi->fill(pT);
          }
          break;
          if (absrap < 0.75) {
            case 310:
              _histPtK0s->fill(pT);
              _temp_h_Kzeros->fill(pT, 2);
              break;
            case 3122:
              if (!(p.hasAncestorWith(Cuts::pid == 3322) || p.hasAncestorWith(Cuts::pid == -3322)
                    || p.hasAncestorWith(Cuts::pid == 3312) || p.hasAncestorWith(Cuts::pid == -3312)
                    || p.hasAncestorWith(Cuts::pid == 3334) || p.hasAncestorWith(Cuts::pid == -3334))) {
                _histPtLambda->fill(pT);
                _temp_h_Lambdas->fill(pT);
              }
              break;
            case -3122:
              if (!(p.hasAncestorWith(Cuts::pid == 3322) || p.hasAncestorWith(Cuts::pid == -3322)
                    || p.hasAncestorWith(Cuts::pid == 3312) || p.hasAncestorWith(Cuts::pid == -3312)
                    || p.hasAncestorWith(Cuts::pid == 3334) || p.hasAncestorWith(Cuts::pid == -3334))) {
                _histPtAntiLambda->fill(pT);
                _temp_h_Lambdas->fill(pT);
              }
              break;
          }
          if (absrap < 0.6) {
            case 333: _histPtPhi->fill(pT); break;
          }
      }
    }
  }
}


void finalize() {
  scale(_histPtK0s, 1. / (1.5 * sumOfWeights()));
  scale(_histPtLambda, 1. / (1.5 * sumOfWeights()));
  scale(_histPtAntiLambda, 1. / (1.5 * sumOfWeights()));
  scale(_histPtXi, 1. / (1.6 * sumOfWeights()));
  scale(_histPtPhi, 1. / (1.2 * sumOfWeights()));
  divide(_temp_h_Lambdas, _temp_h_Kzeros, _h_LamKzero);
}

private:

Histo1DPtr _histPtK0s, _histPtLambda, _histPtAntiLambda, _histPtXi, _histPtPhi;
Histo1DPtr _temp_h_Lambdas, _temp_h_Kzeros;
Estimate1DPtr _h_LamKzero;

};

RIVET_DECLARE_ALIASED_PLUGIN(ALICE_2011_I881474, ALICE_2011_S8909580);

} ```

Aliases: - ALICE_2011_S8909580