LandauFluctuationGenerator.h

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#ifndef FastSimulation_Utilities_LandauFluctuationGenerator_H
#define FastSimulation_Utilities_LandauFluctuationGenerator_H
 
#include "FastSimulation/Utilities/interface/BaseNumericalRandomGenerator.h"
 
#include <cmath>
 
class RandomEngineAndDistribution;
 
class LandauFluctuationGenerator : public BaseNumericalRandomGenerator {
public:
  LandauFluctuationGenerator() : BaseNumericalRandomGenerator(-3.5, 25.) { initialize(); }
 
  ~LandauFluctuationGenerator() override {}
 
  double landau(RandomEngineAndDistribution const* random) const { return generate(random); }
 
  double function(double x) override { return ersatzt(x); }
 
private:
  double ersatzt(double x) { return std::exp(-0.5 * (x + std::exp(-x))) / std::sqrt(2. * M_PI); }
};
#endif