EvtBtoXsnunu_FERMI Class Reference

The evtgen model to produce non-resonant B-> Xs nu nubar decay sample. More...

#include <EvtBtoXsnunu_FERMI.h>

Inheritance diagram for EvtBtoXsnunu_FERMI:

Public Member Functions
	EvtBtoXsnunu_FERMI ()
	Constructor.
virtual	~EvtBtoXsnunu_FERMI ()
	Destructor.
std::string	getName ()
	The function which returns the name of the model.
EvtDecayBase *	clone ()
	The function which makes a copy of the model.
void	initProbMax ()
	The function to sets a maximum probability.
void	init ()
	The function for an initialization.
void	decay (EvtParticle *p)
	The function to determine kinematics of daughter particles based on dGdsb distribution.
double	dGdsbProb (double _sb)
	The function returns the probability density value depending on sb.
double	FermiMomentum (double pf)
	The function returns a momentum of b quark.
double	FermiMomentumProb (double pb, double pf)
	The function returns a probability based on the Fermi motion model.

Private Attributes
double	m_dGdsbProbMax {0.0}
	The maximum value of dGdsb.
double	m_ms {0.2}
	mass of s-quark for the Fermi motion model and EvtGenKine::PhaseSpace.
double	m_mq {0.0}
	mass of spectator quark for the Fermi motion model.
double	m_pf {0.461}
	Parameter for the Fermi motioin model.
double	m_mxmin {1.1}
	Minimum mass of Xs.
double	m_mb_prob {4.8}
	b-quark mass to calculate dGdsb.
double	m_ms_prob {0.2}
	s-quark mass to calculate dGdsb.

Detailed Description

The evtgen model to produce non-resonant B-> Xs nu nubar decay sample.

In this model, kinematics of two neutrinos is not carefully considered. Di-neutrino just decay by EvtGenKine::PhaseSpace

This model adopts the Fermi motion model which is used for EvtBtoXsll model.

The momentums of b-quark and spectator quark are determined by the Fermi motion model. The decay of b-quark is determined by dGdsb probability density function from [arXiv:1509.06248v2].

This model requires 6 parameters: m_ms, m_mq, m_pf, m_mxmin, m_mb_prob, m_ms_prob. m_mb_prob and m_ms_prob are used to calculate dGdsb. m_mb_prob=4.68 and m_ms_prob=0.1 are used in [arXiv:0902.0160]. In [arXiv:hep-ph/9603237], m_mb_prob=4.8 and m_ms_prob=0.2 are used for B->Xs l l decay. m_ms and m_mq are masses of s-quark and the spectator quark for the Fermi motion model. They are related with the kinematics of Xs. m_pf is the Fermi motion momentum used in the Fermi motion model. m_mxmin is the minimum mass of Xs.

You can use the model as follows:

Decay MyB- 1.0 anti-Xsu anti-nu_e nu_e BTOXSNUNU_FERMI 0.2 0.0 0.461 1.1 4.8 0.2; Enddecay

Definition at line 43 of file EvtBtoXsnunu_FERMI.h.

Constructor & Destructor Documentation

EvtBtoXsnunu_FERMI()

EvtBtoXsnunu_FERMI ( )

inline

Constructor.

Definition at line 51 of file EvtBtoXsnunu_FERMI.h.

{}

Member Data Documentation

m_dGdsbProbMax

double m_dGdsbProbMax {0.0}

private

The maximum value of dGdsb.

Definition at line 106 of file EvtBtoXsnunu_FERMI.h.

m_mb_prob

double m_mb_prob {4.8}

private

b-quark mass to calculate dGdsb.

Definition at line 121 of file EvtBtoXsnunu_FERMI.h.

m_mq

double m_mq {0.0}

private

mass of spectator quark for the Fermi motion model.

Definition at line 112 of file EvtBtoXsnunu_FERMI.h.

m_ms

double m_ms {0.2}

private

mass of s-quark for the Fermi motion model and EvtGenKine::PhaseSpace.

Definition at line 109 of file EvtBtoXsnunu_FERMI.h.

m_ms_prob

double m_ms_prob {0.2}

private

s-quark mass to calculate dGdsb.

Definition at line 124 of file EvtBtoXsnunu_FERMI.h.

m_mxmin

double m_mxmin {1.1}

private

Minimum mass of Xs.

Definition at line 118 of file EvtBtoXsnunu_FERMI.h.

m_pf

double m_pf {0.461}

private

Parameter for the Fermi motioin model.

Definition at line 115 of file EvtBtoXsnunu_FERMI.h.

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

• generators/evtgen/models/include/EvtBtoXsnunu_FERMI.h
• generators/evtgen/models/src/EvtBtoXsnunu_FERMI.cc