Abulencia, A. et al. (CDF Collaboration)A. et al. (CDF Collaboration)AbulenciaRONG-SHYANG LU2019-12-262019-12-262006https://scholars.lib.ntu.edu.tw/handle/123456789/441442We measure the branching fraction of the top quark to longitudinally and right-handed polarized W bosons, F0 and F+, using approximately 200pb-1 of p̄p collisions collected by the CDF II detector. We analyze two quantities sensitive to the W helicity: the invariant mass of the charged lepton and the bottom-quark jet in the decay t→Wb→ νb (where =e or μ), and the transverse momentum of the charged lepton. Constrained fits yield F0=0.74-0.34+0.22, and F+<0.27 at the 95% confidence level. These measurements are consistent with the standard model predictions. © 2006 The American Physical Society.journal article10.1103/PhysRevD.73.1111032-s2.0-33745035990https://www.scopus.com/inward/record.uri?eid=2-s2.0-33745035990&doi=10.1103%2fPhysRevD.73.111103&partnerID=40&md5=19a41a683e396ebe2a3050e4bc0b69bf