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File indexing completed on 2021-02-14 14:31:47

0001 #include "CruijffPdf.h"
0002 #include "RooRealVar.h"
0003 #include "RooRealConstant.h"
0004 using namespace RooFit;
0005 
0006 ClassImp(CruijffPdf);
0007 
0008 CruijffPdf::CruijffPdf(const char *name, const char *title,
0009          RooAbsReal& _m, RooAbsReal& _m0, 
0010          RooAbsReal& _sigmaL, RooAbsReal& _sigmaR,
0011          RooAbsReal& _alphaL, RooAbsReal& _alphaR)
0012   :
0013   RooAbsPdf(name, title),
0014   m("m", "Dependent", this, _m),
0015   m0("m0", "M0", this, _m0),
0016   sigmaL("sigmaL", "SigmaL", this, _sigmaL),
0017   sigmaR("sigmaR", "SigmaR", this, _sigmaR),
0018   alphaL("alphaL", "AlphaL", this, _alphaL),
0019   alphaR("alphaR", "AlphaR", this, _alphaR)
0020 {
0021 }
0022 
0023 CruijffPdf::CruijffPdf(const CruijffPdf& other, const char* name) :
0024   RooAbsPdf(other, name), m("m", this, other.m), m0("m0", this, other.m0),
0025   sigmaL("sigmaL", this, other.sigmaL), sigmaR("sigmaR", this, other.sigmaR), 
0026   alphaL("alphaL", this, other.alphaL), alphaR("alphaR", this, other.alphaR)
0027 {
0028 }
0029 
0030 Double_t CruijffPdf::evaluate() const 
0031 {
0032   double dx = (m-m0) ;
0033   double sigma = dx<0 ? sigmaL: sigmaR ;
0034   double alpha = dx<0 ? alphaL: alphaR ;
0035   double f = 2*sigma*sigma + alpha*dx*dx ;
0036   return exp(-dx*dx/f) ;
0037 }