Measurement of neutral current e${\ }^\pm$p cross sections at high Bjorken x with the ZEUS detector

Physical review / D 89(7), 072007 (2014). doi:10.1103/PhysRevD.89.072007
The neutral current ${e}^{±}p$ cross section has been measured up to values of Bjorken $x\cong 1$ with the ZEUS detector at HERA using an integrated luminosity of $187\text{}\text{}{\mathrm{pb}}^{-1}$ of ${e}^{-}p$ and $142\text{}\text{}{\mathrm{pb}}^{-1}$ of ${e}^{+}p$ collisions at $\sqrt{s}=318\text{}\text{}\mathrm{GeV}$. Differential cross sections in $x$ and ${Q}^{2}$, the exchanged boson virtuality, are presented for ${Q}^{2}\ge 725\text{}\text{}{\mathrm{GeV}}^{2}$. An improved reconstruction method and greatly increased amount of data allows a finer binning in the high-$x$ region of the neutral current cross section and leads to a measurement with much improved precision compared to a similar earlier analysis. The measurements are compared to Standard Model expectations based on a variety of recent parton distribution functions.
Published by Soc., [S.l.]