Speaker
Aharon Levy
(Tel Aviv University (IL))
Description
The neutral current $e^\pm p$ 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 ${\rm pb}^{-1}$ of $e^-p$ and 142 ${\rm pb}^{-1}$ of $e^+p$ collisions at $\surd s = 318$ GeV. Differential cross sections in $x$ and $Q^2$, the exchanged boson virtuality, are presented for $Q^2 \geq 725$ 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.
Author
Matthew Wing
(UCL)
