Fig. 12.

The distribution of $(1/\mathit{\sigma })\mathrm{d}\mathit{\sigma }/\mathrm{d}{\mathit{\varphi }}_{\mathit{\eta }}^{\ast }$ at Born level in each region of $|y_{\ell \ell }|$, shown as a ratio to the central rapidity region ($|y_{\ell \ell }|<0.8$), for events with $m_{\ell \ell }$ between 46 to $66\mathrm{GeV}$ (upper plots) and 116 to $150\mathrm{GeV}$ (lower plots). The data, shown as points, are compared to the predictions of ResBos. The light-green band represents the statistical uncertainty on the data and the dark-green band represents the total uncertainty on the data (treating systematic uncertainties as uncorrelated between regions of $|y_{\ell \ell }|$). The yellow band represents the uncertainty in the ResBos calculation arising from varying (See footnote 2) the QCD scales, the non-perturbative parameter $a_Z$, and PDFs