Fig. 13.

The ratio of $(1/\mathit{\sigma })\mathrm{d}\mathit{\sigma }/\mathrm{d}{\mathit{\varphi }}_{\mathit{\eta }}^{\ast }$ in the $m_{\ell \ell }$ region from 116 to $150\mathrm{GeV}$ to that in the $m_{\ell \ell }$ region from 46 to $66\mathrm{GeV}$, for three regions of $|y_{\ell \ell }|$. 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 the mass regions). 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