Fig. 16.

The distribution of $(1/\mathit{\sigma })\mathrm{d}\mathit{\sigma }/\mathrm{d}{p}_{\mathrm{T}}^{\ell \ell }$ at Born level in each region of $|y_{\ell \ell }|$, shown as a ratio to the central rapidity region ($|y_{\ell \ell }|<0.4$), for events at the $Z$ -boson mass peak. The data, shown as points, are compared to the predictions of various MC generators. The light-blue band represents the statistical uncertainty on the data and the dark-blue band represents the total uncertainty on the data (treating systematic uncertainties as uncorrelated between regions of $|y_{\ell \ell }|$)