T. Vickey and T. Liss
University of Illinois at Urbana-Champaign
N. Goldschmidt, K. Bloom, S. Miller, D. Gerdes and D. Amidei
University of Michigan
Abstract
We measure the branching fraction of the top quark to longitudinally and right-handed polar-
ized W bosons, F0 and F+, using approximately 200 pb-1 of pbar p collisions collected by the CDF
experiment. We analyze two kinematic quantities: the invariant mass of the charged lepton and the
bottom-quark jet in the decay t->Wb-> lvb (where l = e or mu), and the transverse momentum of
the charged lepton. We find F0 = 0.74 +0.22 -0.34 (stat. + syst.), and F+ < 0.27 at the 95% confidence
level. These measurements are in agreement with the Standard Model predictions.
A note describing this analysis may be found here.
Summary of Results:
| Analysis |
N |
F0 |
F+ |
| cos(theta*) |
31 |
0.99
+0.29 -0.35 (stat.) +/- 0.19 (syst.) |
0.23
+/- 0.16 (stat.) +/- 0.08 (syst.) |
| pT
(di-lepton) |
26 |
-0.54
+0.35 -0.25 (stat.) +/- 0.16 (syst.) |
-0.47
+/- 0.10 (stat.) +/- 0.09 (syst.) |
| pT
(lepton-plus-jets) |
57 |
0.95
+0.35 -0.42 (stat.) +/- 0.17 (syst.) |
0.11
+0.21 -0.19 (stat.) +/- 0.10 (syst.) |
| pT
(combined) |
83 |
0.31
+0.37 -0.23 (stat.) +/- 0.17 (syst.) |
-0.18
+0.14 -0.12 (stat.) +/-0.12 (syst.) |
| Combined |
- |
0.74
+0.22 -0.34 (stat. + syst.) |
0.00
+0.20 -0.19 (stat. + syst.) |
| 95%
C.L. Limit |
- |
>
0.18 < 0.95 |
<
0.27 |
Plots of fit for F0:
Template Shapes:
