Weak Force interaction partner of Up quark

[Widdekind]

The Weak Force couples Up quarks to Down* quarks, which "are linear combinations of the physical quarks d, s, & b [Mass eigenstates ??]", roughly equal to:

 

d*

= 0.974

d

+ 0.227

s

+ 0.008

b

 

Furthermore, the effective bound-state masses, of the d, s, & b are roughly 340, 486, & 4730 MeV (D.Griffiths. Intro. Elem. Part. (2nd. ed.), pp. 78,135).

 

Using these numbers to calculate the effective bound-state mass, of the Up quark's d* Weak Force interaction partner:

 

<m

_d*

> = 0.974

²

<m

_d

> + 0.227

²

<m

_s

> + 0.008

²

<m

_b

> = 348 MeV

 

Does that mean, that a Down quark must be energetically excited, by about 8 MeV, in order to couple, through the Weak Force, to an Up quark ??