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Measurement of high-Q(2) neutral current deep inelastic e(-) p scattering cross sections with a longitudinally polarised electron beam at HERA
Journal article   Open access   Peer reviewed

Measurement of high-Q(2) neutral current deep inelastic e(-) p scattering cross sections with a longitudinally polarised electron beam at HERA

S. Chekanov, R. J. Nowak, M. Derrick, J. M. Pawlak, S. Magill, W. Perlanski, B. Musgrave, T. Tymieniecka, D. Nicholass, A. F. Zarnecki, …
The European physical journal. C, Particles and fields, Vol.62(4), pp.625-658
08/01/2009
DOI: 10.1140/epjc/s10052-009-1055-6
url
https://doi.org/10.1140/epjc/s10052-009-1055-6View
Published (Version of record) Open Access

Abstract

Measurements of the neutral current cross sections for deep inelastic scattering in e(-) p collisions at HERA with a longitudinally polarised electron beam are presented. The single-differential cross-sections d sigma/dQ(2), d sigma/dx and d sigma/dy and the double-differential cross sections in Q(2) and x are measured in the kinematic region y < 0.9 and Q(2) > 185GeV(2) for both positively and negatively polarised electron beams and for each polarisation state separately. The measurements are based on an integrated luminosity of 169.9pb(-1) taken with the ZEUS detector in 2005 and 2006 at a centre-of-mass energy of 318 GeV. The structure functions x (F) over tilde (3) and xF(3)(gamma Z) are determined by combining the e(-) p results presented in this paper with previously measured e(+) p neutral current data. The asymmetry parameter A(-) is used to demonstrate the parity violating effects of electroweak interactions at large spacelike photon virtuality. The measurements agree well with the predictions of the Standard Model.
Physical Sciences Physics Physics, Particles & Fields Science & Technology

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