Model-independent measurement of the W boson helicity in top quark decays
| dc.creator | D0 Collaboration | |
| dc.creator | Abazov, V. M. | |
| dc.date | 2007-11-01 | |
| dc.date | 2007-12-12 | |
| dc.date.accessioned | 2026-07-07T11:53:55Z | |
| dc.date.available | 2026-07-07T11:53:55Z | |
| dc.description | We present the first model-independent measurement of the helicity of $W$ bosons produced in top quark decays, based on a 1 fb$^{-1}$ sample of candidate $t\bar{t}$ events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider. We reconstruct the angle $θ^*$ between the momenta of the down-type fermion and the top quark in the $W$ boson rest frame for each top quark decay. A fit of the resulting \costheta distribution finds that the fraction of longitudinal $W$ bosons $f_0 = 0.425 \pm 0.166 \hbox{(stat.)} \pm 0.102 \hbox{(syst.)}$ and the fraction of right-handed $W$ bosons $f_+ = 0.119 \pm 0.090 \hbox{(stat.)} \pm 0.053 \hbox{(syst.)}$, which is consistent at the 30% C.L. with the standard model. | |
| dc.description | submitted to Phys. Rev. Lett | |
| dc.identifier | https://arxiv.org/abs/0711.0032 | |
| dc.identifier | http://arxiv.org/abs/0711.0032 | |
| dc.identifier | Phys.Rev.Lett.100:062004,2008 | |
| dc.identifier | doi:10.1103/PhysRevLett.100.062004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/204715 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Model-independent measurement of the W boson helicity in top quark decays | |
| dc.type | text |