Detailed Description

A class for the \(C\) parameter of CPV in \(M \to V \gamma\) decay.

Author: HEPfit Collaboration

Copyright: GNU General Public License

This class is used to compute the \(C\) parameter of CPV in \(M \to V \gamma\) in terms of the helicity amplitudes \(H_V^{(+,-)},\overline{H}_V^{(+,-)}\), computed in the MVgamma class:

\[ C = \frac {( |H_V^+|^2 + |H_V^-|^2 - |\overline{H}_V^+|^2 - |\overline{H}_V^-|^2)}{( |H_V^+|^2 + |H_V^+|^2 +|\overline{H}_V^-|^2 + |\overline{H}_V^-|^2)} \,. \]

Definition at line 751 of file MVgamma.h.

Public Member Functions
	C_MVgamma (const StandardModel &SM_i, QCD::meson meson_i, QCD::meson vector_i)
	Constructor.

double	computeThValue ()
	The \(C\) parameter of CPV in \(M \to V \gamma\).

Public Member Functions inherited from ThObservable
double	getBinMax ()
	A get method to get the maximum value of the bin.

double	getBinMin ()
	A get method to get the minimum value of the bin.

const StandardModel &	getModel ()
	A get method to get the model.

const std::vector< std::string >	getParametersForObservable ()
	A get method to get the parameters for the specific observable.

void	setBinMax (double max)
	A set method to set the maximum value of the bin.

void	setBinMin (double min)
	A set method to set the minimum value of the bin.

void	setParametersForObservable (std::vector< std::string > parametersForObservable_i)
	A set method to get the parameters for the specific observable.

	ThObservable (const StandardModel &SM_i)
	Constructor.

	ThObservable (const ThObservable &orig)
	The copy constructor.

virtual	~ThObservable ()
	The default destructor.

Private Attributes
QCD::meson	meson

QCD::meson	vectorM

Additional Inherited Members
Protected Attributes inherited from ThObservable
double	max
	the bin maximum.

double	min
	The bin minimum.

std::vector< std::string >	parametersForObservable
	a vector of parameter namesfor the specific observable

const StandardModel &	SM
	A reference to an object of StandardMode class.

Constructor & Destructor Documentation

◆ C_MVgamma()

C_MVgamma::C_MVgamma	(	const StandardModel &	SM_i,
		QCD::meson	meson_i,
		QCD::meson	vector_i
	)

Constructor.

Parameters

[in]	SM_i	a reference to an object of type StandardModel
[in]	meson_i	initial meson of the decay
[in]	vector_i	final vector meson of the decay

Definition at line 988 of file MVgamma.cpp.

: ThObservable(SM_i)
{
    meson = meson_i;
    vectorM = vector_i;
    
    setParametersForObservable(SM.getFlavour().getMVgamma(meson, vectorM).initializeMVgammaParameters());
}

Member Function Documentation

◆ computeThValue()

double C_MVgamma::computeThValue ( )

virtual

The \(C\) parameter of CPV in \(M \to V \gamma\).

Returns: \(C\)

Implements ThObservable.

Definition at line 997 of file MVgamma.cpp.

{
    SM.getFlavour().getMVgamma(meson, vectorM).updateParameters();
    
    gslpp::complex HVm = SM.getFlavour().getMVgamma(meson, vectorM).H_V_m();
    gslpp::complex HVm_bar = SM.getFlavour().getMVgamma(meson, vectorM).H_V_m_bar();
    gslpp::complex HVp = SM.getFlavour().getMVgamma(meson, vectorM).H_V_p();
    gslpp::complex HVp_bar = SM.getFlavour().getMVgamma(meson, vectorM).H_V_p_bar();
    /* REMEMBER: ACP = -C by definition in neutral B mesons.*/
    double CC = ((HVp.abs2() + HVm.abs2() - HVp_bar.abs2() - HVm_bar.abs2())) / (HVp.abs2() + HVm.abs2() + HVp_bar.abs2() + HVm_bar.abs2());
    if (meson == QCD::B_P) return -CC;
    else return CC;
            
}

Member Data Documentation

◆ meson

QCD::meson C_MVgamma::meson

private

Initial meson type.

Definition at line 769 of file MVgamma.h.

◆ vectorM

QCD::meson C_MVgamma::vectorM

private

Final vector meson type.

Definition at line 770 of file MVgamma.h.

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