Description

Functor to get the first derivative of the logarithm of the Double Crystal Ball function

The reason for such a function is that the logarithm of a Gaussian is just a parabola, and its derivative a simple line. This provides an easy way to find the transition point.

Todo:: write LaTeX version

#include <DoubleCrystalBall.h>

Inheritance diagram for DLog:

Collaboration diagram for DLog:

Public Member Functions
void	Eval (double *x) final

Public Member Functions inherited from Base
double	Z (double x)

void	SetParameters (double *p)

double	operator() (double x, double p)

	Base (TF1 *f=nullptr)

void	dump ()

virtual	~Base ()=default

Additional Inherited Members
Public Attributes inherited from Base
double	N

double	mu

double	sigma

double	kL

double	nL

double	kR

double	nR

double	AL

double	AR

double	BL

double	BR

double	z

double	aR

double	aL

double	expaR2

double	expaL2

double	CR

double	CL

double	DD

double	K

double	result

Member Function Documentation

◆ Eval()

void Eval ( double * x )

finalvirtual

Virtual method to calculate the value of the function, given the internal set of parameters and the value of x given as parameter.

Implements Base.

 {
     if (*x < kL) {
         double B = nL/aL + aL;
         result = (nL/sigma) / (B - z);
     }
     else if (*x < kR) {
         result = -z/sigma;
     }
     else {
         double B = nR/aR - aR;
         result = -(nR/sigma) / (B + z);
     }
 }

The documentation for this struct was generated from the following files:

/builds/cms-analysis/general/DasAnalysisSystem/Core/Installer/Core/JEC/interface/DoubleCrystalBall.h
/builds/cms-analysis/general/DasAnalysisSystem/Core/Installer/Core/JEC/src/DoubleCrystalBall.cc

Description

Public Member Functions

Additional Inherited Members

Member Function Documentation

◆ Eval()