Neutral current cross-section measurement at low e?‘?2 and high e?‘| with the ZEUS detector at HERA

摘要

The measurements of the reduced cross-sections for $e^{+} p$ deep inelastic scattering at high inelasticities e?‘| for three different centre-of-mass energies, 318, 251 and 225 GeV have been extended to lower momentum transferred squared, e?‘?2. The analysis of satellite vertex events allows one to extend the cross-section measurement at high y down to e?‘?2 = 4.5 GeV2, substantially lower that the previously published cross-section measurement from which the longitudinal structure function, $F_{L}$, was extracted.