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/*****************************************************************************
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* Project: CMS detector at the CERN
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*
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* Package: PhysicsTools/TagAndProbe/RooCMSShape
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*
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*
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* Authors:
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* Nadia Adam, Princeton - neadam@princeton.edu
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* Adam Hunt, Princeton - ahunt@princeton.edu
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* Kalanand Mishra, Fermilab - kalanand@fnal.gov
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*
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* Description:
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* Defines a probability density function which has exponential decay
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* distribution at high mass beyond the pole position (say, Z peak)
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* but turns over (i.e., error function) at low mass due to threshold
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* effect. We use this to model the background shape in Z->ll invariant
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* mass.
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* History:
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*
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*
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* Copyright (C) 2008 FNAL
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*****************************************************************************/
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#ifndef ROO_CMS_SHAPE
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#define ROO_CMS_SHAPE
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#include "RooAbsPdf.h"
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#include "RooRealProxy.h"
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#include "RooAbsReal.h"
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#include "TMath.h"
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#include "RooMath.h"
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class RooCMSShape : public RooAbsPdf {
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public:
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RooCMSShape() {}
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RooCMSShape(const char *name, const char *title,
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RooAbsReal& _x,
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RooAbsReal& _alpha,
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RooAbsReal& _beta,
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RooAbsReal& _gamma,
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RooAbsReal& _peak);
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RooCMSShape(const RooCMSShape& other, const char* name);
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inline virtual TObject* clone(const char* newname) const { return new RooCMSShape(*this,newname); }
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inline ~RooCMSShape() {}
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Double_t evaluate() const ;
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protected:
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RooRealProxy x ;
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RooRealProxy alpha ;
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RooRealProxy beta ;
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RooRealProxy gamma ;
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RooRealProxy peak ;
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};
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#endif
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