RooJohnsonSU.h

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 * Project: RooFit                                                           *
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//
// file: RooJohnsonSU.h
// author: Maurizio Martinelli (Nikhef)
// email: maurizio.martinelli@cern.ch
//
// description: this distribution can have highly asymmetric tails and is
//   therefore helpful in fitting the mass difference between D* and D0 mass.
//
// reference: Johnson, N. L. (1954). Systems of frequency curves derived from the first law of Laplace., Trabajos de Estadistica, 5, 283-291.
//

#ifndef ROOJOHNSONSU
#define ROOJOHNSONSU

#include "RooAbsPdf.h"
#include "RooRealProxy.h"
#include "RooCategoryProxy.h"
#include "RooAbsReal.h"
#include "RooAbsCategory.h"

class RooJohnsonSU : public RooAbsPdf {
public:
    RooJohnsonSU() {} ;
    RooJohnsonSU(const char *name, const char *title,
                 RooAbsReal& _x,
                 RooAbsReal& _mean,
                 RooAbsReal& _width,
                 RooAbsReal& _nu,
                 RooAbsReal& _tau);
    RooJohnsonSU(const RooJohnsonSU& other, const char* name=0) ;
    TObject* clone(const char* newname) const { return new RooJohnsonSU(*this,newname); }
    inline virtual ~RooJohnsonSU() { }
    
protected:
    
    RooRealProxy x ;
    RooRealProxy mean ;
    RooRealProxy width ;
    RooRealProxy nu ;
    RooRealProxy tau ;
    
    Double_t evaluate() const;
    // Integrals
    Int_t getAnalyticalIntegral(RooArgSet& allVars, RooArgSet& analVars, const char* rangeName=0) const;
    Double_t analyticalIntegral(Int_t code, const char* rangeName=0) const;
    
private:
    
    //ClassDef(RooJohnsonSU,1) // Your description goes here...
};

#endif