1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/Beam.hh"
  4#include "Rivet/Projections/FinalState.hh"
  5#include "Rivet/Projections/ChargedFinalState.hh"
  6#include "Rivet/Projections/UnstableParticles.hh"
  7
  8namespace Rivet {
  9
 10
 11  /// @brief OPAL strange baryon paper
 12  ///
 13  /// @author Peter Richardson
 14  class OPAL_1997_I421978 : public Analysis {
 15  public:
 16
 17    RIVET_DEFAULT_ANALYSIS_CTOR(OPAL_1997_I421978);
 18
 19
 20    /// @name Analysis methods
 21    /// @{
 22
 23    void init() {
 24      declare(Beam(), "Beams");
 25      declare(ChargedFinalState(), "FS");
 26      declare(UnstableParticles(), "UFS");
 27
 28      book(_histXpLambda         , 1, 1, 1);
 29      book(_histXiLambda         , 2, 1, 1);
 30      book(_histXpXiMinus        , 3, 1, 1);
 31      book(_histXiXiMinus        , 4, 1, 1);
 32      book(_histXpSigma1385Plus  , 5, 1, 1);
 33      book(_histXiSigma1385Plus  , 6, 1, 1);
 34      book(_histXpSigma1385Minus , 7, 1, 1);
 35      book(_histXiSigma1385Minus , 8, 1, 1);
 36      book(_histXpXi1530         , 9, 1, 1);
 37      book(_histXiXi1530         ,10, 1, 1);
 38      book(_histXpLambda1520     ,11, 1, 1);
 39      book(_histXiLambda1520     ,12, 1, 1);
 40    }
 41
 42
 43    void analyze(const Event& e) {
 44      // First, veto on leptonic events by requiring at least 4 charged FS particles
 45      const FinalState& fs = apply<FinalState>(e, "FS");
 46      const size_t numParticles = fs.particles().size();
 47
 48      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
 49      if (numParticles < 2) {
 50        MSG_DEBUG("Failed leptonic event cut");
 51        vetoEvent;
 52      }
 53      MSG_DEBUG("Passed leptonic event cut");
 54
 55      // Get beams and average beam momentum
 56      const ParticlePair& beams = apply<Beam>(e, "Beams").beams();
 57      const double meanBeamMom = ( beams.first.p3().mod() +
 58                                   beams.second.p3().mod() ) / 2.0;
 59      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
 60
 61      // Final state of unstable particles to get particle spectra
 62      const UnstableParticles& ufs = apply<UnstableParticles>(e, "UFS");
 63
 64      for (const Particle& p : ufs.particles()) {
 65        const int id = p.abspid();
 66        if (!inRange(id, 3000, 3999)) continue;
 67
 68        const double xE = p.E()/meanBeamMom;
 69        const double xp = p.p3().mod()/(2*meanBeamMom);
 70        const double xi = -log(xp);
 71
 72        switch (id) {
 73        case 3312:
 74          _histXpXiMinus->fill(xE);
 75          _histXiXiMinus->fill(xi);
 76          break;
 77        case 3224:
 78          _histXpSigma1385Plus->fill(xE);
 79          _histXiSigma1385Plus->fill(xi);
 80          break;
 81        case 3114:
 82          _histXpSigma1385Minus->fill(xE);
 83          _histXiSigma1385Minus->fill(xi);
 84          break;
 85        case 3122:
 86          _histXpLambda->fill(xE);
 87          _histXiLambda->fill(xi);
 88          break;
 89        case 3324:
 90          _histXpXi1530->fill(xE);
 91          _histXiXi1530->fill(xi);
 92          break;
 93        case 3124:
 94          _histXpLambda1520->fill(xE);
 95          _histXiLambda1520->fill(xi);
 96          break;
 97        }
 98      }
 99    }
100
101
102    /// Finalize
103    void finalize() {
104      double fact=1./sumOfWeights();
105      scale(_histXpLambda        , fact);
106      scale(_histXiLambda        , fact);
107      scale(_histXpXiMinus       , fact);
108      scale(_histXiXiMinus       , fact);
109      scale(_histXpSigma1385Plus , fact);
110      scale(_histXiSigma1385Plus , fact);
111      scale(_histXpSigma1385Minus, fact);
112      scale(_histXiSigma1385Minus, fact);
113      scale(_histXpXi1530        , fact);
114      scale(_histXiXi1530        , fact);
115      scale(_histXpLambda1520    , fact);
116      scale(_histXiLambda1520    , fact);
117    }
118
119    /// @}
120
121
122  private:
123
124    /// @name Histograms
125    /// @{
126    Histo1DPtr _histXpLambda;
127    Histo1DPtr _histXiLambda;
128    Histo1DPtr _histXpXiMinus;
129    Histo1DPtr _histXiXiMinus;
130    Histo1DPtr _histXpSigma1385Plus;
131    Histo1DPtr _histXiSigma1385Plus;
132    Histo1DPtr _histXpSigma1385Minus;
133    Histo1DPtr _histXiSigma1385Minus;
134    Histo1DPtr _histXpXi1530;
135    Histo1DPtr _histXiXi1530;
136    Histo1DPtr _histXpLambda1520;
137    Histo1DPtr _histXiLambda1520;
138    /// @}
139
140  };
141
142
143
144  RIVET_DECLARE_ALIASED_PLUGIN(OPAL_1997_I421978, OPAL_1997_S3396100);
145
146}