BR_MVgamma Class Reference

A class for the \(BR\) in \(M \to V \gamma\) decay. More...

#include <MVgamma.h>

Inheritance diagram for BR_MVgamma:
[legend]
Collaboration diagram for BR_MVgamma:
[legend]

Detailed Description

A class for the \(BR\) in \(M \to V \gamma\) decay.

Author
HEPfit Collaboration

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

\[ BR = \frac {\alpha_e G_F^2 M_b^2 M_M \lambda}{(4\pi)^2 4 W_M} ( |H_V^+|^2 + |H_A^+|^2 +|\overline{H}_V^-|^2 + |\overline{H}_A^-|^2) \,. \]

Definition at line 159 of file MVgamma.h.

Public Member Functions

 BR_MVgamma (const StandardModel &SM_i, StandardModel::meson meson_i, StandardModel::meson vector_i)
 Constructor. More...
 
double computeThValue ()
 The \(BR\) in \(M \to V \gamma\). More...
 
- Public Member Functions inherited from MVgamma
gslpp::complex G1 (double s)
 Correction in eq. (42) of [43]. More...
 
gslpp::complex G8 ()
 Correction in eq. (42) of [43]. More...
 
gslpp::complex H1 (double s)
 Correction in eq. (42) of [43]. More...
 
gslpp::complex H8 ()
 Correction in eq. (42) of [43]. More...
 
gslpp::complex H_V_m ()
 The helicity amplitude \( H_V^- \). More...
 
gslpp::complex H_V_m_bar ()
 The helicity amplitude \( \bar{H}_V^- \). More...
 
gslpp::complex H_V_p ()
 The helicity amplitude \( H_V^+ \). More...
 
gslpp::complex H_V_p_bar ()
 The helicity amplitude \( \bar{H}_V^+ \). More...
 
 MVgamma (const StandardModel &SM_i, StandardModel::meson meson_i, StandardModel::meson vector_i)
 Constructor. More...
 
double T_1 ()
 The transverse form factor \( T_1 \). More...
 
void updateParameters ()
 The update parameter method for MVgamma. More...
 
virtual ~MVgamma ()
 Destructor. More...
 
- Public Member Functions inherited from ThObservable
double getBinMax ()
 A get method to get the maximum value of the bin. More...
 
double getBinMin ()
 A get method to get the minimum value of the bin. More...
 
const StandardModelgetModel ()
 A get method to get the model. More...
 
void setBinMax (double max)
 A set method to set the maximum value of the bin. More...
 
void setBinMin (double min)
 A set method to set the minimum value of the bin. More...
 
 ThObservable (const StandardModel &SM_i)
 Constructor. More...
 
 ThObservable (const ThObservable &orig)
 The copy constructor. More...
 
virtual ~ThObservable ()
 The default destructor. More...
 

Private Attributes

StandardModel::meson meson
 
StandardModel::meson vectorM
 

Additional Inherited Members

- Public Attributes inherited from MVgamma
double a_0T1
 
double a_1T1
 
double a_2T1
 
double ale
 
gslpp::vector< gslpp::complex > ** allcoeff
 
gslpp::vector< gslpp::complex > ** allcoeffh
 
gslpp::vector< gslpp::complex > ** allcoeffprime
 
gslpp::complex C_2
 
gslpp::complex C_2h
 
gslpp::complex C_7
 
gslpp::complex C_7p
 
gslpp::complex C_8
 
gslpp::complex C_8h
 
double GF
 
gslpp::complex h [2]
 
double lambda
 
gslpp::complex lambda_t
 
double Mb
 
double Mc
 
double MM
 
double MM2
 
double MRT1_2
 
double Ms
 
double mu_b
 
double mu_h
 
double MV
 
double MW
 
double width
 
- Protected Attributes inherited from ThObservable
double max
 the bin maximum. More...
 
double min
 The bin minimum. More...
 
const StandardModelSM
 A reference to an object of StandardMode class. More...
 

Constructor & Destructor Documentation

BR_MVgamma::BR_MVgamma ( const StandardModel SM_i,
StandardModel::meson  meson_i,
StandardModel::meson  vector_i 
)

Constructor.

Parameters
[in]SM_ia reference to an object of type StandardModel
[in]meson_iinitial meson of the decay
[in]vector_ifinal vector meson of the decay

Definition at line 160 of file MVgamma.cpp.

161 : MVgamma(SM_i, meson_i, vector_i)
162 {
163  meson = meson_i;
164  vectorM = vector_i;
165 }
MVgamma(const StandardModel &SM_i, StandardModel::meson meson_i, StandardModel::meson vector_i)
Constructor.
Definition: MVgamma.cpp:12
StandardModel::meson meson
Definition: MVgamma.h:177
StandardModel::meson vectorM
Definition: MVgamma.h:178

Member Function Documentation

double BR_MVgamma::computeThValue ( )
virtual

The \(BR\) in \(M \to V \gamma\).

Returns
\(BR\)

Implements ThObservable.

Definition at line 167 of file MVgamma.cpp.

168 {
170 
171  return ale * pow(GF * Mb / (4 * M_PI * M_PI), 2.) * MM * lambda / (4. * width) * (H_V_p().abs2() + H_V_m().abs2() + H_V_p_bar().abs2() + H_V_m_bar().abs2());
172 }
void updateParameters()
The update parameter method for MVgamma.
Definition: MVgamma.cpp:23
double abs2() const
double GF
Definition: MVgamma.h:50
gslpp::complex H_V_p()
The helicity amplitude .
Definition: MVgamma.cpp:138
complex pow(const complex &z1, const complex &z2)
double Mb
Definition: MVgamma.h:55
double width
Definition: MVgamma.h:59
gslpp::complex H_V_p_bar()
The helicity amplitude .
Definition: MVgamma.cpp:150
gslpp::complex H_V_m()
The helicity amplitude .
Definition: MVgamma.cpp:130
double ale
Definition: MVgamma.h:51
gslpp::complex H_V_m_bar()
The helicity amplitude .
Definition: MVgamma.cpp:143
double lambda
Definition: MVgamma.h:64
double MM
Definition: MVgamma.h:52

Member Data Documentation

StandardModel::meson BR_MVgamma::meson
private

Initial meson type.

Definition at line 177 of file MVgamma.h.

StandardModel::meson BR_MVgamma::vectorM
private

Final vector meson type.

Definition at line 178 of file MVgamma.h.


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