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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief Charged particle spectra for a range of energies
class TASSO_1982_I177174 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1982_I177174);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
if(isCompatibleWithSqrtS(12.)) {
book(_h_x2,2,1,1);
book(_h_x3,3,1,1);
}
else if (isCompatibleWithSqrtS(14.)) {
book(_h_x1,1,1,1);
book(_h_x2,2,1,2);
book(_h_x3,3,1,2);
}
else if (isCompatibleWithSqrtS(22.)) {
book(_h_x1,1,1,2);
book(_h_x2,2,1,3);
book(_h_x3,3,1,3);
}
else if (isCompatibleWithSqrtS(25.)) {
book(_h_x2,2,1,4);
book(_h_x3,3,1,4);
}
else if (isCompatibleWithSqrtS(30.)) {
book(_h_x2,2,1,5);
book(_h_x3,3,1,5);
}
else if (isCompatibleWithSqrtS(34.)) {
book(_h_x2,2,1,6);
book(_h_x3,3,1,6);
}
else if (isCompatibleWithSqrtS(35.)) {
book(_h_x2, 2,1,7);
book(_h_x3, 3,1,7);
}
if(inRange(sqrtS()/GeV, 29.9,36.7))
book(_h_x1, 1,1,3);
if(_h_x1==Histo1DPtr() && _h_x2==Histo1DPtr() && _h_x3==Histo1DPtr())
MSG_ERROR("Beam energy not supported!");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
const size_t numParticles = fs.particles().size();
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
for (const Particle& p : fs.particles()) {
double xp = p.p3().mod()/meanBeamMom;
if(_h_x1!=Histo1DPtr()) _h_x1->fill(xp);
if(_h_x2!=Histo1DPtr()) _h_x2->fill(xp);
if(_h_x3!=Histo1DPtr()) _h_x3->fill(xp);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_x1, crossSection()/microbarn/sumOfWeights()*sqr(sqrtS()));
scale(_h_x2, crossSection()/microbarn/sumOfWeights()*sqr(sqrtS()));
scale(_h_x3, 1./sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_x1,_h_x2,_h_x3;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TASSO_1982_I177174);
}
|