Measurement of the leptonic asymmetry in $t\overline{t}$ events produced in $p\overline{p}$ collisions at $\sqrt{s}\mathbf{=}1.96\text{ }\text{ }\mathrm{TeV}$

Measurement of the leptonic asymmetry in $t \bar{t}$ events produced in $p \bar{p}$ collisions at $\sqrt{s} = 1.96 TeV$

T. Aaltonen et al. (CDF Collaboration)

Phys. Rev. D 88, 072003 – Published 10 October 2013; Erratum Phys. Rev. D 94, 099901 (2016)

Abstract

We measure the asymmetry in the charge-weighted rapidity $q y_{ℓ}$ of the lepton in semileptonic $t \bar{t}$ decays recorded with the CDF II detector using the full Tevatron Run II sample, corresponding to an integrated luminosity of $9.4 {fb}^{- 1}$ . A parametrization of the asymmetry as a function of $q y_{ℓ}$ is used to correct for the finite acceptance of the detector and recover the production-level asymmetry. The result of $A_{FB}^{ℓ} = {0.094}_{- 0.029}^{+ 0.032}$ is to be compared to the standard model next-to-leading-order prediction of $A_{FB}^{ℓ} = 0.038 \pm 0.003$ .