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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// @brief Charged particle spectra between 2.2 and 4.8 GeV
class BESII_2004_I622224 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESII_2004_I622224);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
const ChargedFinalState fs;
declare(fs, "FS");
unsigned int iloc(0);
if(isCompatibleWithSqrtS(2.2 , 1E-3))
iloc = 1;
else if(isCompatibleWithSqrtS(2.6 , 1E-3))
iloc = 2;
else if(isCompatibleWithSqrtS(3.0 , 1E-3))
iloc = 3;
else if(isCompatibleWithSqrtS(3.2 , 1E-3))
iloc = 4;
else if(isCompatibleWithSqrtS(4.6 , 1E-3))
iloc = 5;
else if(isCompatibleWithSqrtS(4.8 , 1E-3))
iloc = 6;
else
MSG_ERROR("Beam energy not supported!");
assert(iloc!=0);
book(_h_ln, iloc ,1,1);
book(_h_weight, "TMP/Weight");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
if(fs.particles().size()==2 &&
abs(fs.particles()[0].pid())==13 &&
abs(fs.particles()[1].pid())==13) vetoEvent;
for (const Particle& p : fs.particles()) {
const Vector3 mom3 = p.p3();
double pp = mom3.mod();
double xi = -log(2.*pp/sqrtS());
_h_ln->fill(xi);
}
_h_weight->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_ln,1./_h_weight->sumW());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_ln;
CounterPtr _h_weight;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(BESII_2004_I622224);
}
|