We present a measurement of W boson polarization in
top-quark decays in t¯t events with decays to dilepton final states
using 5.1 fb−1 integrated luminosity in p¯p collisions collected
by the CDF II detector at the Tevatron. A simultaneous measurement
of the fractions of longitudinal (f0) and right-handed (f+) W bosons
yields the results f0 = 0.71+0.18−0.17(stat) } 0.06(syst) and f+
= −0.07 }0.09(stat)}0.03(syst). Combining this measurement with
our previous result based on single lepton final states, we obtain f0 =
0.84 }0.09(stat) } 0.05(syst) and f+ = −0.16 } 0.05(stat) }
0.04(syst). The results are consistent with standard model expectation.
Return to top of page.
Go to Physics Results
Updated: Thursday, 2012 May 03 09:26:06 CDT automatically from input from Stephanie A Schuler