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#ifndef CMSCGENnorm_h
#define CMSCGENnorm_h
//
// CMSCGENnorm.h P. Biallass 2006
//
// code based on l3cgen.f by T.Hebbeker
// implemented in CMSSW by P. Biallass 11.04.2006
//
/////////////////////////////////////////////////////////////////////////////////
//
// calculate normalisation factor (if statistics sufficient):
//
//
// flux dN/dOmega/dE/dA/dt at 100 GeV and zenith angle 0 (per sr-> theta<32.77 deg):
// 2.63 * E-3 +- 0.06 * E-3 / m**2 / sr / GeV / s (see Biallass+Hebbeker internal note 2007 "Improved Parametrization of the Cosmic Muon Flux for the generator CMSCGEN")
//
// percentage of rejected events and surface needs to be corrected for later!
//
// for this we also need to:
//
// count muons with energy 100 GeV
// and those with 1 - cos(theta) < 1/(2pi) (-> gives directly dN/dOmega/dE !) (this means theta<32.77deg)
//
#include "TMath.h"
#include <iostream>
#include "GeneratorInterface/CosmicMuonGenerator/interface/CosmicMuonParameters.h"
class CMSCGENnorm {
private:
int n100;
int n100cos;
int n;
float flux;
float Nnorm;
public:
// constructor
CMSCGENnorm() {
n100 = 0;
n100cos = 0;
}
//destructor
~CMSCGENnorm() {
n100 = 0;
n100cos = 0;
}
int events_n100cos(double energy,
double theta); //count number of cosmic with energy 100 GeV and those with 1 - cos(theta) < 1/(2pi)
float norm(int n100cos); //normalize to known flux
};
#endif
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