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Weak Force interaction partner of Up quark

Widdekind
in Modern and Theoretical Physics

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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 ??

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