CDF measure F
0
=0.91+-0.39
D0 measure k>-0.25 @68%cl.
G
(t->Wb) = V
tb
2
G
(t->X)
CDF:
|V
tb
| > 0.76 (95%cl)
W Polarisation,
Vtb, Top Spin
.88 in SM
The W couples preferentially to LH objects.
In top decays this results in W having a preferred spin orientiation.
In SM the longitudinal W should be produced 70% of the time.
This affects angular distribution.
2 Tops are produced with their spins either aligned or unaligned.
for other quarks this info is washed out…
for top its translated to final products and affects the angular distribution of final state leptons.
I said t->Wb… Ture 99% of time but occasionally Ws or Wd.
Described by CKM mixing matrix.
Vtb the element that says how often t couple to b is ~100% and the width to is related to the
width to all like so.
By simply counting the number of b final states….
