Showing papers by "W. Brückner published in 1998"
11 Nov 1998-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The HERMES experiment as mentioned in this paper collects data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and 3 He.
Abstract: The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and 3 He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3 T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon.
284 citations
TL;DR: A measurement of the proton spin structure function g1p(x,Q2) in deep-inelastic scattering is presented in this article, where the data were taken with the 27.6 GeV longitudinally polarised positron beam at HERA incident on a long-range pure hydrogen gas target internal to the storage ring.
174 citations
TL;DR: In this article, the virtual photon absorption cross section differences for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 GeV and 0.8 GeV, respectively.
52 citations
TL;DR: In this article, photo-production of ψ(2S) mesons has been observed at HERA for photon-proton center-of-mass energies in the range 40 to 160 GeV.
26 citations
TL;DR: In this article, the double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA and the cross section is determined as a function of the average transverse jet energy.
Abstract: The double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energyETjets for ranges of the fractional energyξγjets of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scale between 80
23 citations
TL;DR: In this article, the properties of hadron production in diffractive deep-inelastic positron-proton scattering were studied using data collected in 1994 by the H1 experiment at HERA.
15 citations
11 Oct 1998-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The HERMES spectrometer behind the bending magnet consists of two pairs of large planar 6-plane drift chambers as mentioned in this paper, and the design and performance of these chambers are described.
Abstract: The tracking system of the HERMES spectrometer behind the bending magnet consists of two pairs of large planar 6-plane drift chambers. The design and performance of these chambers is described. This description comprises details on the mechanical and electronical design, information about the gas mixture used and its properties, results on alignment, calibration, resolution, and efficiencies, and a discussion of the experience gained through the first three years of operation.
14 citations