Abstract
We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in production in dilepton final states using of proton-antiproton collisions at with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of and a top-quark polarization times spin analyzing power in the beam basis of , with a correlation of between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of . If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of . A combination with the D0 measurement in the final state yields an asymmetry of . Within their respective uncertainties, all these results are consistent with the standard model expectations.
- Received 22 July 2015
DOI:https://doi.org/10.1103/PhysRevD.92.052007
© 2015 American Physical Society