include/EvtGenModels/EvtBtoXsgammaRootFinder.hh

0001
0002 /***********************************************************************
0003 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
0004 *                                                                      *
0005 * This file is part of EvtGen.                                         *
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0020
0021 #ifndef EVTBTOXSGAMMAROOTFINDER_HH
0022 #define EVTBTOXSGAMMAROOTFINDER_HH
0023
0024 //-------------
0025 // C Headers --
0026 //-------------
0027 extern "C" {
0028 }
0029
0030 //#include "EvtGenBase/EvtItgAbsFunction.hh"
0031 class EvtItgAbsFunction;
0032
0033 // Description:
0034 //       Root finding algorithms using the bilear method. Basic structure
0035 //       lifted from the BaBar IntegrationUtils root finding algorithm
0036 //       (author John Back).
0037
0038 class EvtBtoXsgammaRootFinder final {
0039   public:
0040     double GetRootSingleFunc( const EvtItgAbsFunction* theFunc,
0041                               double functionValue, double lowerValue,
0042                               double upperValue, double precision );
0043
0044     double GetGaussIntegFcnRoot( EvtItgAbsFunction* theFunc1,
0045                                  EvtItgAbsFunction* theFunc2,
0046                                  double integ1Precision, double integ2Precision,
0047                                  int maxLoop1, int maxLoop2, double integLower,
0048                                  double integUpper, double lowerValue,
0049                                  double upperValue, double precision );
0050 };
0051
0052 #endif