Measurement of neutral current e±p cross sections at high Bjorken x with the ZEUS detector

Apr 29, 2014, 9:16 AM
Auditorium (BUW)



Oral presentation WG1: Structure Functions and Parton Densities WG1: Structure Functions and Parton Densities


Aharon Levy (Tel Aviv University (IL))


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.

Primary author

Matthew Wing (UCL)

Presentation materials