1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/Beam.hh"
  4#include "Rivet/Projections/ChargedFinalState.hh"
  5#include "Rivet/Projections/Thrust.hh"
  6
  7namespace Rivet {
  8
  9
 10  /// @brief Charged particle multiplicities and distributions
 11  class TASSO_1980_I143691 : public Analysis {
 12  public:
 13
 14    /// Constructor
 15    RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1980_I143691);
 16
 17
 18    /// @name Analysis methods
 19    //@{
 20
 21    /// Book histograms and initialise projections before the run
 22    void init() {
 23
 24      // Initialise and register projections
 25      ChargedFinalState cfs;
 26      declare(cfs, "CFS");
 27      declare(Thrust(cfs), "Thrust");
 28      
 29
 30      // Book histograms
 31      book(_mult, "/TMP/mult");
 32      unsigned int iloc(0);
 33      sqs = 1.0;
 34      if(isCompatibleWithSqrtS(13)) {
 35	iloc = 1;
 36	sqs = 13.0;
 37      }
 38      else if(isCompatibleWithSqrtS(17)) {
 39	iloc = 2;
 40        sqs = 17.0;
 41      }	
 42      else if (isCompatibleWithSqrtS(22)) {
 43	iloc = 2;
 44	sqs = 22.;
 45      }
 46      else if(isCompatibleWithSqrtS(27.6)) {
 47	iloc = 3;
 48	sqs = 27.6;
 49      }
 50      else if (isCompatibleWithSqrtS(30.3)) {
 51	iloc = 3;
 52	sqs = 30.3;
 53      }
 54      else if (isCompatibleWithSqrtS(31.2)) {
 55	iloc = 3;
 56	sqs = 31.2;
 57      }
 58      else
 59	MSG_ERROR("Beam energy not supported!");
 60
 61      book(_h_rap,iloc+1,1,1);
 62      book(_h_x  ,iloc+4,1,1);
 63    }
 64
 65
 66    /// Perform the per-event analysis
 67    void analyze(const Event& event) {
 68      const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
 69      // thrust
 70      const Thrust& thrust = apply<Thrust>(event, "Thrust");
 71      Vector3 axis=thrust.thrustAxis();
 72      for (const Particle& p : cfs.particles()) {
 73	const Vector3 mom3 = p.p3();
 74	double pp = mom3.mod();
 75	double xP = 2.*pp/sqs;
 76	_h_x->fill(xP);
 77        const double mom = dot(axis, mom3);
 78	const double rap = 0.5 * log((p.E() + mom) /
 79				     (p.E() - mom));
 80	_h_rap->fill(fabs(rap));
 81	_mult->fill();
 82      }
 83    }
 84
 85
 86    /// Normalise histograms etc., after the run
 87    void finalize() {
 88
 89      scale(_h_rap, 1./sumOfWeights());
 90      scale(_h_x  , crossSection()*sqr(sqs)/sumOfWeights()/microbarn);  
 91
 92      scale(_mult,1./sumOfWeights());
 93      
 94      Scatter2D temphisto(refData(1, 1, 1));
 95      Scatter2DPtr     mult;
 96      book(mult,1, 1, 1);
 97      for (size_t b = 0; b < temphisto.numPoints(); b++) {
 98	const double x  = temphisto.point(b).x();
 99	pair<double,double> ex = temphisto.point(b).xErrs();
100	pair<double,double> ex2 = ex;
101	if(ex2.first ==0.) ex2. first=0.2;
102	if(ex2.second==0.) ex2.second=0.2;
103	if (inRange(sqs, x-ex2.first, x+ex2.second)) {
104	  mult   ->addPoint(x, _mult->val(), ex, make_pair(_mult->err(), _mult->err()));
105	}
106	else {
107	  mult   ->addPoint(x, 0., ex, make_pair(0.,.0));
108	}
109      }
110    }
111
112    //@}
113
114
115    /// @name Histograms
116    //@{
117    Histo1DPtr _h_rap, _h_x;
118    CounterPtr _mult;
119    double sqs;
120    //@}
121
122
123  };
124
125
126  // The hook for the plugin system
127  RIVET_DECLARE_PLUGIN(TASSO_1980_I143691);
128
129
130}