The class provides the form factors for semileptonic D and D* decays with full mass dependence. More...

#include <EvtBGLFF.h>

Inheritance diagram for EvtBGLFF:

Collaboration diagram for EvtBGLFF:

Public Member Functions
	EvtBGLFF (double bglap_0, double bglap_1, double bglap_2, double bglap_3, double bgla0_0, double bgla0_1, double bgla0_2, double bgla0_3)
	Default constructor.

	EvtBGLFF (double bgla_0, double bgla_1, double bglb_0, double bglb_1, double bglc_1, double bglc_2)
	Default constructor.

void	getscalarff (EvtId parent, EvtId daught, double t, double mass, double fp, double f0)
	Returns scalar ffs.

void	getvectorff (EvtId parent, EvtId daught, double t, double mass, double a1f, double a2f, double vf, double a0f)
	Returns vector ffs.

void	gettensorff (EvtId, EvtId, double, double, double , double , double , double )
	Returns tensor ffs.

void	getbaryonff (EvtId, EvtId, double, double, double , double , double , double )
	Returns baryon ffs.

void	getdiracff (EvtId, EvtId, double, double, double , double , double , double , double , double )
	Returns dirac ffs.

void	getraritaff (EvtId, EvtId, double, double, double , double , double , double , double , double , double , double )
	Returns tarita ffs.

Private Attributes
double	ap_0 {0}
	B -> Dlnu: ai_n (i = p —vector, 0 —scalar; n = 0,1,2,3) are free coefficients of z expansion in dispersion relation parametrization from C.G.Boyd, B.Grinstein, R.F.Lebed, Phys. More...

double	ap_1 {0}
	1st-order z expansion coeffieient for vector form factor: f_+

double	ap_2 {0}
	2nd-order z expansion coeffieient for vector form factor: f_+

double	ap_3 {0}
	3rd-order z expansion coeffieient for vector form factor: f_+

double	a0_0 {0}
	0th-order z expansion coeffieient for scalar form factor f_0

double	a0_1 {0}
	1st-order z expansion coeffieient for scalar form factor f_0

double	a0_2 {0}
	2nd-order z expansion coeffieient for scalar form factor f_0

double	a0_3 {0}
	3rd-order z expansion coeffieient for scalar form factor f_0

double	a_0 {0}
	B->D*lnu z expansion coeffieients More...

double	a_1 {0}
	1st-order z expansion coeffieient for form factor g

double	b_0 {0}
	0th-order z expansion coeffieient for form factor f

double	b_1 {0}
	1st-order z expansion coeffieient for form factor f

double	c_1 {0}
	1st-order z expansion coeffieient for form factor F1

double	c_2 {0}
	2nd-order z expansion coeffieient for form factor F1

Detailed Description

The class provides the form factors for semileptonic D and D* decays with full mass dependence.

Definition at line 17 of file EvtBGLFF.h.

Member Data Documentation

◆ a_0

double a_0 {0}

private

B->D*lnu z expansion coeffieients

0th-order z expansion coeffieient for form factor g

Definition at line 118 of file EvtBGLFF.h.

◆ ap_0

double ap_0 {0}

private

B -> Dlnu: ai_n (i = p —vector, 0 —scalar; n = 0,1,2,3) are free coefficients of z expansion in dispersion relation parametrization from C.G.Boyd, B.Grinstein, R.F.Lebed, Phys.

Rev. Lett. 74,4603(1995)

Chosen the order of series N=3, i.e. a_0 + a_1 * z + a_2 * z^2 + a_3 * z^3

Fitted values cited from R.Glattauer, etc. (Belle) Phys. Rev. D 93,032006 (2016). a+0, a+1, a+2, a+3 : 0.0126, -0.094, 0.34, -0.1 a00, a01, a02, a03 : 0.0115, -0.057, 0.12, 0.4

NOTE : This is the default BGL model in Belle II.

B -> D*lnu (l=e, mu): a_n, b_n (n = 0,1) and c_n (n = 0,1,2) are free coefficients of z expansion parametrization from C.G.Boyd, B.Grinstein and R.F.Lebed, Phys. Rev. D 56,6895(1997) & B.Grinstein, A.Kobach, Phys. Lett. B 771(2017)359-364

For the expansion of form factors g and f, the order of series N=1, i.e. a_0 + a_1*z For the expansion of form factors F1, the order of series N=2, i.e. c_0 + c_1 * z + c_2 * z**2 (g, f and F1 are the sub-terms of helicity amplitude)

Fitted values are taken from a private discussion of Florian Bernlochner based on B.Grinstein and A.Kobach, Phys. Lett. B 771(2017)359-364

It should not be used to generate D* with tau, due to the lack of fitted parameters in a0f amplitude. 0th-order z expansion coeffieient for vector form factor: f_+

Definition at line 89 of file EvtBGLFF.h.

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

generators/evtgen/models/include/EvtBGLFF.h
generators/evtgen/models/src/EvtBGLFF.cc

Public Member Functions

Private Attributes

Detailed Description

Member Data Documentation

◆ a_0

◆ ap_0