TY  - JOUR
AU  - CDF Collaboration (Aaltonen, T. et al
AU  - Cabrera, S.
PY  - 2010
DA  - 2010//
TI  - Measurement of W-Boson Polarization in Top-Quark Decay in p(p)over-bar Collisions at root s=1.96 TeV
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 042002
EP  - 8pp
VL  - 105
IS  - 4
PB  - Amer Physical Soc
AB  - We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb(-1) of p (p) over bar collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c(2), three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f(0)) and right-handed (f(0)) W bosons yields the model- independent results f(0) =0. 88 +/- 0.11(stat) +/- 0.06(syst) and f(+) = 0.15 +/- 0.07(stat) +/- 0.06(syst) with a correlation coefficient of -0.59. A measurement of f(0) [f(+)] constraining f(+) [f(0)] to its standard model value of 0.0 [0.7] yields f(0) 0.70 + 0.07(stat) +/- 0.04(syst) [f(+) – 0.01 +/- 0.02(stat) +/- 0.05(syst)]. All these results are consistent with standard model expectations. We achieve the single most precise measurements of f(0) for both the model- independent and modeldependent determinations.
SN  - 0031-9007
UR  - http://arXiv.org/abs/1003.0224
UR  - https://doi.org/10.1103/PhysRevLett.105.042002
DO  - 10.1103/PhysRevLett.105.042002
LA  - English
N1  - ISI:000280234400009
ID  - CDFCollaborationAaltonen+Cabrera2010
ER  -