, Volume 11, Issue 3, pp 427-445

Measurement of high- \(Q^{2}\) neutral-current \(e^+p\) deep inelastic scattering cross-sections at HERA

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The \(e^+p\) neutral-current deep inelastic scattering differential cross-sections \(d\sigma/dQ^2\) , for \(Q^2 > 400\) GeV \(^2\) , \(d\sigma /dx\) and \(d\sigma/dy\) , for \(Q^2 > 400\) , 2500 and 10000 GeV \(^2\) , have been measured with the ZEUS detector at HERA. The data sample of 47.7 pb \(^{-1}\) was collected at a center-of-mass energy of 300 GeV. The cross-section, \(d\sigma/dQ^2\) , falls by six orders of magnitude between \(Q^2 =400\) and 40000 GeV \(^2\) . The predictions of the Standard Model are in very good agreement with the data. Complementing the observations of time-like \(Z^0\) contributions to fermion-antifermion annihilation, the data provide direct evidence for the presence of \(Z^0\) exchange in the space-like region explored by deep inelastic scattering.

Received: 18 May 1999 / Published online: 3 August 1999