High- Q2 neutral current cross sections in e+p deep inelastic scattering at s=318 GeV

Le résumé fourni par la source

Cross sections for ${e}^{+}p$ neutral current deep inelastic scattering have been measured at a center-of-mass energy of $\sqrt{s}=318\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ with the ZEUS detector at HERA using an integrated luminosity of $63.2\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$. The double-differential cross section, ${d}^{2}\ensuremath{\sigma}/dxd{Q}^{2}$, is presented for $200\text{ }{\mathrm{G}\mathrm{e}\mathrm{V}}^{2}<{Q}^{2}<30\text{ }000\text{ }{\mathrm{G}\mathrm{e}\mathrm{V}}^{2}$ and for $0.005 200\text{ }{\mathrm{G}\mathrm{e}\mathrm{V}}^{2}$. The effect of $Z$-boson-exchange is seen in $d\ensuremath{\sigma}/dx$ measured for ${Q}^{2}>10\text{ }000\text{ }{\mathrm{G}\mathrm{e}\mathrm{V}}^{2}$. The data presented here were combined with ZEUS ${e}^{+}p$ neutral current data taken at $\sqrt{s}=300\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ and the structure function ${F}_{2}^{\mathrm{e}\mathrm{m}}$ was extracted. All results agree well with the predictions of the Standard Model.

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