- #211
arivero
Gold Member
- 3,498
- 175
Hans de Vries said:[tex]
\frac{r}{r_c}\ =\ \sqrt{-\frac{1}{2} l(l+1)\ \ +\ \
\sqrt{\left(\frac{1}{2} l(l+1) \right)^2\ +\ l(l+1)} }
[/tex]
I have only noticed it now; of course the funny thing about [tex]r_c[/tex] is that it depends of the mass. So if we ask [tex]r[/tex]to keep the same value when we jump from [tex]l=1/2[/tex] to [tex]l=1[/tex], then we are asking the mass of the orbiting particle to jump from [tex]\propto M_{W}[/tex] to [tex]\propto M_Z[/tex].
We can put also (with L^2 adimensional here)
[tex]
r {M_l c \over \hbar}\ =\ \sqrt{-\frac{1}{2} L^2\ \ +\ \
\sqrt{\left(\frac{1}{2} L^2 \right)^2\ +\ L^2} }
[/tex]
or[tex]
M_l \ =\ {1 \over \sqrt 2}{\hbar\over c r} \sqrt{- L^2\ \ +\ \
\sqrt{\left( L^2 \right)^2\ + 4 \ L^2} }
[/tex]
or, with [tex]M \equiv {\hbar\over c r}[/tex] (hmm, we could even to hide here the sqrt(2), could we?), and natural units to become grouptheoretical...
[tex]
M_s^2 = \frac 12 ( - M^2 S^2 + \sqrt{ (M^2S^2)^2 + 4 M^2 (M^2 S^2) })
[/tex]
and now we should go to check the Casimir invariants of unitary representations of the Lorentz group and see if this combination has some meaning for physmathematicians. Note that in the semiclassical limit [tex]\hbar \approx 0[/tex] we have a tautological [tex]M_s^2 \approx M^2[/tex] so the formula is not very bad at all.
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